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types.html 44 KB
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  1. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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  2. <html><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    3. 

  3. <title>Types - Boost.Outcome documentation</title>
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    9. 

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    10. 

  10. <a accesskey="p" href="../reference/policies/throw_bad_result_access.html"><img src="../images/prev.png" alt="Prev"></a>
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  11.     <a accesskey="u" href="../reference.html"><img src="../images/up.png" alt="Up"></a>
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    13. 

  13. 

  14.   <div class="titlepage"><div><div><h1 style="clear: both">Types</h1></div></div></div>
    15. 

  15. <ol class="children children-li"><li>
    16. 

  16. 	<a href="../reference/types/basic_outcome.html" ><code>basic_outcome&lt;T, EC, EP, NoValuePolicy&gt;</code></a>
    17. 

  17. <p>A type carrying one of (i) a successful <code>T</code> (ii) a disappointment <code>EC</code> (iii) a failure <code>EP</code> (iv) both a disappointment <code>EC</code> and a failure <code>EP</code>, with <code>NoValuePolicy</code> specifying what to do if one tries to read state which isn&rsquo;t there.</p><ol><li>
    18. 

  18. 	<a href="../reference/types/basic_outcome/default.html" ><code>basic_outcome() = delete</code></a>
    19. 

  19. <p>The default constructor (disabled).</p><li>
    20. 

  20. 	<a href="../reference/types/basic_outcome/move_constructor.html" ><code>basic_outcome(basic_outcome &amp;&amp;)</code></a>
    21. 

  21. <p>Move constructor. Constexpr, triviality and noexcept propagating.</p><li>
    22. 

  22. 	<a href="../reference/types/basic_outcome/copy_constructor.html" ><code>basic_outcome(const basic_outcome &amp;)</code></a>
    23. 

  23. <p>Copy constructor. Constexpr, triviality and noexcept propagating.</p><li>
    24. 

  24. 	<a href="../reference/types/basic_outcome/move_assignment.html" ><code>basic_outcome &amp;operator=(basic_outcome &amp;&amp;)</code></a>
    25. 

  25. <p>Move assignment. Constexpr, triviality and noexcept propagating.</p><li>
    26. 

  26. 	<a href="../reference/types/basic_outcome/copy_assignment.html" ><code>basic_outcome &amp;operator=(const basic_outcome &amp;)</code></a>
    27. 

  27. <p>Copy assignment. Constexpr, triviality and noexcept propagating.</p><li>
    28. 

  28. 	<a href="../reference/types/basic_outcome/destructor.html" ><code>~basic_outcome()</code></a>
    29. 

  29. <p>Destructor. Constexpr, triviality and noexcept propagating.</p><li>
    30. 

  30. 	<a href="../reference/types/basic_outcome/disabling_catchall.html" ><code>basic_outcome(Args...) = delete</code></a>
    31. 

  31. <p>Disabling catchall constructor used to give useful diagnostic error when trying to use non-inplace constructors when <code>predicate::constructors_enabled</code> is false.</p><li>
    32. 

  32. 	<a href="../reference/types/basic_outcome/disabling_implicit_constructor.html" ><code>basic_outcome(X &amp;&amp;) = delete</code></a>
    33. 

  33. <p>Disabling implicit constructor used to give useful diagnostic error when trying to use implicit constructors when <code>predicate::implicit_constructors_enabled</code> is false.</p><li>
    34. 

  34. 	<a href="../reference/types/basic_outcome/implicit_value_converting_constructor.html" ><code>basic_outcome(R &amp;&amp;)</code></a>
    35. 

  35. <p>Implicit <code>value_type</code> constructor. Available if <code>predicate::enable_value_converting_constructor&lt;R&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    36. 

  36. 	<a href="../reference/types/basic_outcome/implicit_error_converting_constructor.html" ><code>basic_outcome(S &amp;&amp;)</code></a>
    37. 

  37. <p>Implicit <code>error_type</code> constructor. Available if <code>predicate::enable_error_converting_constructor&lt;S&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    38. 

  38. 	<a href="../reference/types/basic_outcome/implicit_error_condition_converting_constructor.html" ><code>basic_outcome(ErrorCondEnum &amp;&amp;)</code></a>
    39. 

  39. <p>Implicit <code>error_type</code> from <code>ErrorCondEnum</code> constructor. Available if <code>predicate::enable_error_condition_converting_constructor&lt;ErrorCondEnum&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    40. 

  40. 	<a href="../reference/types/basic_outcome/implicit_exception_converting_constructor.html" ><code>basic_outcome(P &amp;&amp;)</code></a>
    41. 

  41. <p>Implicit <code>exception_type</code> constructor. Available if <code>predicate::enable_exception_converting_constructor&lt;P&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    42. 

  42. 	<a href="../reference/types/basic_outcome/implicit_error_exception_converting_constructor.html" ><code>basic_outcome(S &amp;&amp;, P &amp;&amp;)</code></a>
    43. 

  43. <p>Implicit <code>error_type</code> + <code>exception_type</code> constructor. Available if <code>predicate::enable_error_exception_converting_constructor&lt;S, P&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    44. 

  44. 	<a href="../reference/types/basic_outcome/explicit_valueorerror_converting_constructor.html" ><code>explicit basic_outcome(ValueOrError&lt;T, E&gt; &amp;&amp;)</code></a>
    45. 

  45. <p>Explicit converting constructor from <code>ValueOrError&lt;T, E&gt;</code> concept matching types. Available if <code>convert::value_or_error&lt;&gt;</code> permits it. Constexpr, triviality and noexcept propagating.</p><li>
    46. 

  46. 	<a href="../reference/types/basic_outcome/explicit_copy_converting_constructor.html" ><code>explicit basic_outcome(const basic_outcome&lt;A, B, C, D&gt; &amp;)</code></a>
    47. 

  47. <p>Explicit converting copy constructor from compatible <code>basic_outcome</code>. Available if <code>predicate::enable_compatible_conversion&lt;A, B, C, D&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    48. 

  48. 	<a href="../reference/types/basic_outcome/explicit_move_converting_constructor.html" ><code>explicit basic_outcome(basic_outcome&lt;A, B, C, D&gt; &amp;&amp;)</code></a>
    49. 

  49. <p>Explicit converting move constructor from compatible <code>basic_outcome</code>. Available if <code>predicate::enable_compatible_conversion&lt;A, B, C, D&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    50. 

  50. 	<a href="../reference/types/basic_outcome/explicit_result_copy_converting_constructor.html" ><code>explicit basic_outcome(const basic_result&lt;A, B, C&gt; &amp;)</code></a>
    51. 

  51. <p>Explicit converting copy constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_compatible_conversion&lt;A, B, void, C&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    52. 

  52. 	<a href="../reference/types/basic_outcome/explicit_result_move_converting_constructor.html" ><code>explicit basic_outcome(basic_result&lt;A, B, C&gt; &amp;&amp;)</code></a>
    53. 

  53. <p>Explicit converting move constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_compatible_conversion&lt;A, B, void, C&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    54. 

  54. 	<a href="../reference/types/basic_outcome/explicit_result_make_error_code_copy_converting_constructor.html" ><code>explicit basic_outcome(const basic_result&lt;A, B, C&gt; &amp;)</code></a>
    55. 

  55. <p>Explicit converting copy constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_make_error_code_compatible_conversion&lt;A, B, void, C&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    56. 

  56. 	<a href="../reference/types/basic_outcome/explicit_result_make_error_code_move_converting_constructor.html" ><code>explicit basic_outcome(basic_result&lt;A, B, C&gt; &amp;&amp;)</code></a>
    57. 

  57. <p>Explicit converting move constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_make_error_code_compatible_conversion&lt;A, B, void, C&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    58. 

  58. 	<a href="../reference/types/basic_outcome/explicit_inplace_value_constructor.html" ><code>explicit basic_outcome(in_place_type_t&lt;value_type_if_enabled&gt;, Args ...)</code></a>
    59. 

  59. <p>Explicit inplace value constructor. Available if <code>predicate::enable_inplace_value_constructor&lt;Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    60. 

  60. 	<a href="../reference/types/basic_outcome/explicit_inplace_value_constructor_il.html" ><code>explicit basic_outcome(in_place_type_t&lt;value_type_if_enabled&gt;, std::initializer_list&lt;U&gt;, Args ...)</code></a>
    61. 

  61. <p>Explicit inplace value constructor. Available if <code>predicate::enable_inplace_value_constructor&lt;std::initializer_list&lt;U&gt;, Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    62. 

  62. 	<a href="../reference/types/basic_outcome/explicit_inplace_error_constructor.html" ><code>explicit basic_outcome(in_place_type_t&lt;error_type_if_enabled&gt;, Args ...)</code></a>
    63. 

  63. <p>Explicit inplace error constructor. Available if <code>predicate::enable_inplace_error_constructor&lt;Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    64. 

  64. 	<a href="../reference/types/basic_outcome/explicit_inplace_error_constructor_il.html" ><code>explicit basic_outcome(in_place_type_t&lt;error_type_if_enabled&gt;, std::initializer_list&lt;U&gt;, Args ...)</code></a>
    65. 

  65. <p>Explicit inplace error constructor. Available if <code>predicate::enable_inplace_error_constructor&lt;std::initializer_list&lt;U&gt;, Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    66. 

  66. 	<a href="../reference/types/basic_outcome/explicit_inplace_exception_constructor.html" ><code>explicit basic_outcome(in_place_type_t&lt;exception_type_if_enabled&gt;, Args ...)</code></a>
    67. 

  67. <p>Explicit inplace exception constructor. Available if <code>predicate::enable_inplace_exception_constructor&lt;Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    68. 

  68. 	<a href="../reference/types/basic_outcome/explicit_inplace_exception_constructor_il.html" ><code>explicit basic_outcome(in_place_type_t&lt;exception_type_if_enabled&gt;, std::initializer_list&lt;U&gt;, Args ...)</code></a>
    69. 

  69. <p>Explicit inplace exception constructor. Available if <code>predicate::enable_inplace_exception_constructor&lt;std::initializer_list&lt;U&gt;, Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    70. 

  70. 	<a href="../reference/types/basic_outcome/implicit_inplace_value_error_exception_constructor.html" ><code>basic_outcome(A1 &amp;&amp;, A2 &amp;&amp;, Args ...)</code></a>
    71. 

  71. <p>Implicit inplace value or error or exception constructor. Available if <code>predicate::enable_inplace_value_error_exception_constructor&lt;A1, A2, Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    72. 

  72. 	<a href="../reference/types/basic_outcome/implicit_success_copy_constructor.html" ><code>basic_outcome(const success_type&lt;T&gt; &amp;)</code></a>
    73. 

  73. <p>Implicit value-from-success-type-sugar copy constructor. Available if <code>predicate::enable_compatible_conversion&lt;T, void, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p><li>
    74. 

  74. 	<a href="../reference/types/basic_outcome/implicit_success_move_constructor.html" ><code>basic_outcome(success_type&lt;T&gt; &amp;&amp;)</code></a>
    75. 

  75. <p>Implicit value-from-success-type-sugar move constructor. Available if <code>predicate::enable_compatible_conversion&lt;T, void, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p><li>
    76. 

  76. 	<a href="../reference/types/basic_outcome/implicit_failure_error_copy_constructor.html" ><code>basic_outcome(const failure_type&lt;EC&gt; &amp;)</code></a>
    77. 

  77. <p>Implicit error-from-failure-type-sugar copy constructor. Available if <code>predicate::enable_compatible_conversion&lt;void, EC, void, void&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    78. 

  78. 	<a href="../reference/types/basic_outcome/implicit_failure_error_move_constructor.html" ><code>basic_outcome(failure_type&lt;EC&gt; &amp;&amp;)</code></a>
    79. 

  79. <p>Implicit error-from-failure-type-sugar move constructor. Available if <code>predicate::enable_compatible_conversion&lt;void, EC, void, void&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    80. 

  80. 	<a href="../reference/types/basic_outcome/implicit_failure_error_make_error_code_copy_constructor.html" ><code>basic_outcome(const failure_type&lt;EC&gt; &amp;)</code></a>
    81. 

  81. <p>Implicit error-from-failure-type-sugar copy constructor. Available if <code>predicate::enable_make_error_code_compatible_conversion&lt;void, EC, void, void&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    82. 

  82. 	<a href="../reference/types/basic_outcome/implicit_failure_error_make_error_code_move_constructor.html" ><code>basic_outcome(failure_type&lt;EC&gt; &amp;&amp;)</code></a>
    83. 

  83. <p>Implicit error-from-failure-type-sugar move constructor. Available if <code>predicate::enable_make_error_code_compatible_conversion&lt;void, EC, void, void&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    84. 

  84. 	<a href="../reference/types/basic_outcome/implicit_failure_exception_copy_constructor.html" ><code>basic_outcome(const failure_type&lt;EP&gt; &amp;)</code></a>
    85. 

  85. <p>Implicit exception-from-failure-type-sugar copy constructor. Available if <code>predicate::enable_compatible_conversion&lt;void, void, EP, void&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    86. 

  86. 	<a href="../reference/types/basic_outcome/implicit_failure_exception_move_constructor.html" ><code>basic_outcome(failure_type&lt;EP&gt; &amp;&amp;)</code></a>
    87. 

  87. <p>Implicit exception-from-failure-type-sugar move constructor. Available if <code>predicate::enable_compatible_conversion&lt;void, void, EP, void&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    88. 

  88. 	<a href="../reference/types/basic_outcome/implicit_failure_error_exception_copy_constructor.html" ><code>basic_outcome(const failure_type&lt;EC, EP&gt; &amp;)</code></a>
    89. 

  89. <p>Implicit error-and-exception-from-failure-type-sugar copy constructor. Available if <code>predicate::enable_compatible_conversion&lt;void, EC, EP, void&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    90. 

  90. 	<a href="../reference/types/basic_outcome/implicit_failure_error_exception_move_constructor.html" ><code>basic_outcome(failure_type&lt;EC, EP&gt; &amp;&amp;)</code></a>
    91. 

  91. <p>Implicit error-and-exception-from-failure-type-sugar move constructor. Available if <code>predicate::enable_compatible_conversion&lt;void, EC, EP, void&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    92. 

  92. 	<a href="../reference/types/basic_outcome/operator_bool.html" ><code>explicit operator bool() const noexcept</code></a>
    93. 

  93. <p>Returns true if a value is present. Constexpr, never throws.</p><li>
    94. 

  94. 	<a href="../reference/types/basic_outcome/has_value.html" ><code>bool has_value() const noexcept</code></a>
    95. 

  95. <p>Returns true if a value is present. Constexpr, never throws.</p><li>
    96. 

  96. 	<a href="../reference/types/basic_outcome/has_error.html" ><code>bool has_error() const noexcept</code></a>
    97. 

  97. <p>Returns true if an error is present. Constexpr, never throws.</p><li>
    98. 

  98. 	<a href="../reference/types/basic_outcome/has_exception.html" ><code>bool has_exception() const noexcept</code></a>
    99. 

  99. <p>Returns true if an exception is present. Constexpr, never throws.</p><li>
    100. 

  100. 	<a href="../reference/types/basic_outcome/has_failure.html" ><code>bool has_failure() const noexcept</code></a>
    101. 

  101. <p>Returns true if there is either an error or an exception. Constexpr, never throws.</p><li>
    102. 

  102. 	<a href="../reference/types/basic_outcome/assume_value_lvalue.html" ><code>value_type &amp;assume_value() &amp; noexcept</code></a>
    103. 

  103. <p>Narrow contract lvalue reference observer of any value present. Constexpr propagating, never throws.</p><li>
    104. 

  104. 	<a href="../reference/types/basic_outcome/assume_value_lvalue_const.html" ><code>const value_type &amp;assume_value() const &amp; noexcept</code></a>
    105. 

  105. <p>Narrow contract const lvalue reference observer of any value present. Constexpr propagating, never throws.</p><li>
    106. 

  106. 	<a href="../reference/types/basic_outcome/assume_value_rvalue.html" ><code>value_type &amp;&amp;assume_value() &amp;&amp; noexcept</code></a>
    107. 

  107. <p>Narrow contract rvalue reference observer of any value present. Constexpr propagating, never throws.</p><li>
    108. 

  108. 	<a href="../reference/types/basic_outcome/assume_value_rvalue_const.html" ><code>const value_type &amp;&amp;assume_value() const &amp;&amp; noexcept</code></a>
    109. 

  109. <p>Narrow contract const rvalue reference observer of any value present. Constexpr propagating, never throws.</p><li>
    110. 

  110. 	<a href="../reference/types/basic_outcome/value_lvalue.html" ><code>value_type &amp;value() &amp;</code></a>
    111. 

  111. <p>Wide contract lvalue reference observer of any value present. Constexpr propagating.</p><li>
    112. 

  112. 	<a href="../reference/types/basic_outcome/value_lvalue_const.html" ><code>const value_type &amp;value() const &amp;</code></a>
    113. 

  113. <p>Wide contract const lvalue reference observer of any value present. Constexpr propagating.</p><li>
    114. 

  114. 	<a href="../reference/types/basic_outcome/value_rvalue.html" ><code>value_type &amp;&amp;value() &amp;&amp;</code></a>
    115. 

  115. <p>Wide contract rvalue reference observer of any value present. Constexpr propagating.</p><li>
    116. 

  116. 	<a href="../reference/types/basic_outcome/value_rvalue_const.html" ><code>const value_type &amp;&amp;value() const &amp;&amp;</code></a>
    117. 

  117. <p>Wide contract const rvalue reference observer of any value present. Constexpr propagating.</p><li>
    118. 

  118. 	<a href="../reference/types/basic_outcome/assume_error_lvalue.html" ><code>error_type &amp;assume_error() &amp; noexcept</code></a>
    119. 

  119. <p>Narrow contract lvalue reference observer of the stored error. Constexpr propagating, never throws.</p><li>
    120. 

  120. 	<a href="../reference/types/basic_outcome/assume_error_lvalue_const.html" ><code>const error_type &amp;assume_error() const &amp; noexcept</code></a>
    121. 

  121. <p>Narrow contract const lvalue reference observer of the stored error. Constexpr propagating, never throws.</p><li>
    122. 

  122. 	<a href="../reference/types/basic_outcome/assume_error_rvalue.html" ><code>error_type &amp;&amp;assume_error() &amp;&amp; noexcept</code></a>
    123. 

  123. <p>Narrow contract rvalue reference observer of the stored error. Constexpr propagating, never throws.</p><li>
    124. 

  124. 	<a href="../reference/types/basic_outcome/assume_error_rvalue_const.html" ><code>const error_type &amp;&amp;assume_error() const &amp;&amp; noexcept</code></a>
    125. 

  125. <p>Narrow contract const rvalue reference observer of the stored error. Constexpr propagating, never throws.</p><li>
    126. 

  126. 	<a href="../reference/types/basic_outcome/error_lvalue.html" ><code>error_type &amp;error() &amp;</code></a>
    127. 

  127. <p>Wide contract lvalue reference observer of the stored error. Constexpr propagating.</p><li>
    128. 

  128. 	<a href="../reference/types/basic_outcome/error_lvalue_const.html" ><code>const error_type &amp;error() const &amp;</code></a>
    129. 

  129. <p>Wide contract const lvalue reference observer of the stored error. Constexpr propagating.</p><li>
    130. 

  130. 	<a href="../reference/types/basic_outcome/error_rvalue.html" ><code>error_type &amp;&amp;error() &amp;&amp;</code></a>
    131. 

  131. <p>Wide contract rvalue reference observer of the stored error. Constexpr propagating.</p><li>
    132. 

  132. 	<a href="../reference/types/basic_outcome/error_rvalue_const.html" ><code>const error_type &amp;&amp;error() const &amp;&amp;</code></a>
    133. 

  133. <p>Wide contract const rvalue reference observer of the stored error. Constexpr propagating.</p><li>
    134. 

  134. 	<a href="../reference/types/basic_outcome/assume_exception_lvalue.html" ><code>exception_type &amp;assume_exception() &amp; noexcept</code></a>
    135. 

  135. <p>Narrow contract lvalue reference observer of the stored exception. Constexpr propagating, never throws.</p><li>
    136. 

  136. 	<a href="../reference/types/basic_outcome/assume_exception_lvalue_const.html" ><code>const exception_type &amp;assume_exception() const &amp; noexcept</code></a>
    137. 

  137. <p>Narrow contract const lvalue reference observer of the stored exception. Constexpr propagating, never throws.</p><li>
    138. 

  138. 	<a href="../reference/types/basic_outcome/assume_exception_rvalue_const.html" ><code>const exception_type &amp;&amp;assume_exception() const &amp;&amp; noexcept</code></a>
    139. 

  139. <p>Narrow contract const rvalue reference observer of the stored exception. Constexpr propagating, never throws.</p><li>
    140. 

  140. 	<a href="../reference/types/basic_outcome/assume_exception_rvalue.html" ><code>exception_type &amp;&amp;assume_exception() &amp;&amp; noexcept</code></a>
    141. 

  141. <p>Narrow contract rvalue reference observer of the stored exception. Constexpr propagating, never throws.</p><li>
    142. 

  142. 	<a href="../reference/types/basic_outcome/exception_lvalue.html" ><code>exception_type &amp;exception() &amp;</code></a>
    143. 

  143. <p>Wide contract lvalue reference observer of the stored exception. Constexpr propagating.</p><li>
    144. 

  144. 	<a href="../reference/types/basic_outcome/exception_lvalue_const.html" ><code>const exception_type &amp;exception() const &amp;</code></a>
    145. 

  145. <p>Wide contract const lvalue reference observer of the stored exception. Constexpr propagating.</p><li>
    146. 

  146. 	<a href="../reference/types/basic_outcome/exception_rvalue.html" ><code>exception_type &amp;&amp;exception() &amp;&amp;</code></a>
    147. 

  147. <p>Wide contract rvalue reference observer of the stored exception. Constexpr propagating.</p><li>
    148. 

  148. 	<a href="../reference/types/basic_outcome/exception_rvalue_const.html" ><code>const exception_type &amp;&amp;exception() const &amp;&amp;</code></a>
    149. 

  149. <p>Wide contract const rvalue reference observer of the stored exception. Constexpr propagating.</p><li>
    150. 

  150. 	<a href="../reference/types/basic_outcome/failure.html" ><code>exception_type failure() const noexcept</code></a>
    151. 

  151. <p>Synthesising observer of the stored exception or error. Available if the traits <code>is_error_code_available&lt;T&gt;</code> and <code>is_exception_ptr_available&lt;T&gt;</code> are both true. Never throws.</p><li>
    152. 

  152. 	<a href="../reference/types/basic_outcome/equality_basic_result.html" ><code>bool operator==(const basic_result&lt;A, B, C&gt; &amp;) const</code></a>
    153. 

  153. <p>Returns true if this outcome compares equal to the other result. Constexpr and noexcept propagating.</p><li>
    154. 

  154. 	<a href="../reference/types/basic_outcome/equality_basic_outcome.html" ><code>bool operator==(const basic_outcome&lt;A, B, C, D&gt; &amp;) const</code></a>
    155. 

  155. <p>Returns true if this outcome compares equal to the other outcome. Constexpr and noexcept propagating.</p><li>
    156. 

  156. 	<a href="../reference/types/basic_outcome/inequality_success_type.html" ><code>bool operator==(const success_type&lt;A&gt; &amp;) const</code></a>
    157. 

  157. <p>Returns true if this result compares equal to the success type sugar. Constexpr and noexcept propagating.</p><li>
    158. 

  158. 	<a href="../reference/types/basic_outcome/equality_failure_type.html" ><code>bool operator==(const failure_type&lt;A, B&gt; &amp;) const</code></a>
    159. 

  159. <p>Returns true if this outcome compares equal to the failure type sugar. Constexpr and noexcept propagating.</p><li>
    160. 

  160. 	<a href="../reference/types/basic_outcome/inequality_basic_result.html" ><code>bool operator!=(const basic_result&lt;A, B, C&gt; &amp;) const</code></a>
    161. 

  161. <p>Returns true if this outcome does not compare equal to the other result. Constexpr and noexcept propagating.</p><li>
    162. 

  162. 	<a href="../reference/types/basic_outcome/inequality_basic_outcome.html" ><code>bool operator!=(const basic_outcome&lt;A, B, C, D&gt; &amp;) const</code></a>
    163. 

  163. <p>Returns true if this outcome does not compare equal to the other outcome. Constexpr and noexcept propagating.</p><li>
    164. 

  164. 	<a href="../reference/types/basic_outcome/equality_success_type.html" ><code>bool operator!=(const success_type&lt;A&gt; &amp;) const</code></a>
    165. 

  165. <p>Returns true if this outcome does not compare equal to the success type sugar. Constexpr and noexcept propagating.</p><li>
    166. 

  166. 	<a href="../reference/types/basic_outcome/inequality_failure_type.html" ><code>bool operator!=(const failure_type&lt;A, B&gt; &amp;) const</code></a>
    167. 

  167. <p>Returns true if this outcome does not compare equal to the failure type sugar. Constexpr and noexcept propagating.</p><li>
    168. 

  168. 	<a href="../reference/types/basic_outcome/swap.html" ><code>void swap(basic_outcome &amp;)</code></a>
    169. 

  169. <p>Swap one basic_outcome with another, with the strong guarantee. Noexcept propagating.</p><li>
    170. 

  170. 	<a href="../reference/types/basic_outcome/as_failure_lvalue.html" ><code>failure_type&lt;error_type, exception_type&gt; as_failure() const &amp;</code></a>
    171. 

  171. <p>Return the output from free function <code>failure()</code> containing a copy of any errored and/or excepted state.</p><li>
    172. 

  172. 	<a href="../reference/types/basic_outcome/as_failure_rvalue.html" ><code>failure_type&lt;error_type, exception_type&gt; as_failure() &amp;&amp;</code></a>
    173. 

  173. <p>Return the output from free function <code>failure()</code> containing a move of any errored and/or excepted state.</p></li></ol><li>
    174. 

  174. 	<a href="../reference/types/basic_result.html" ><code>basic_result&lt;T, E, NoValuePolicy&gt;</code></a>
    175. 

  175. <p>A sum type carrying either a successful <code>T</code>, or a disappointment <code>E</code>, with <code>NoValuePolicy</code> specifying what to do if one tries to read state which isn&rsquo;t there.</p><ol><li>
    176. 

  176. 	<a href="../reference/types/basic_result/default.html" ><code>basic_result() = delete</code></a>
    177. 

  177. <p>The default constructor (disabled).</p><li>
    178. 

  178. 	<a href="../reference/types/basic_result/move_constructor.html" ><code>basic_result(basic_result &amp;&amp;)</code></a>
    179. 

  179. <p>Move constructor. Constexpr, triviality and noexcept propagating.</p><li>
    180. 

  180. 	<a href="../reference/types/basic_result/copy_constructor.html" ><code>basic_result(const basic_result &amp;)</code></a>
    181. 

  181. <p>Copy constructor. Constexpr, triviality and noexcept propagating.</p><li>
    182. 

  182. 	<a href="../reference/types/basic_result/move_assignment.html" ><code>basic_result &amp;operator=(basic_result &amp;&amp;)</code></a>
    183. 

  183. <p>Move assignment. Constexpr, triviality and noexcept propagating.</p><li>
    184. 

  184. 	<a href="../reference/types/basic_result/copy_assignment.html" ><code>basic_result &amp;operator=(const basic_result &amp;)</code></a>
    185. 

  185. <p>Copy assignment. Constexpr, triviality and noexcept propagating.</p><li>
    186. 

  186. 	<a href="../reference/types/basic_result/destructor.html" ><code>~basic_result()</code></a>
    187. 

  187. <p>Destructor. Constexpr, triviality and noexcept propagating.</p><li>
    188. 

  188. 	<a href="../reference/types/basic_result/disabling_catchall.html" ><code>basic_result(Args...) = delete</code></a>
    189. 

  189. <p>Disabling catchall constructor used to give useful diagnostic error when trying to use non-inplace constructors when <code>predicate::constructors_enabled</code> is false.</p><li>
    190. 

  190. 	<a href="../reference/types/basic_result/disabling_implicit_constructor.html" ><code>basic_result(X &amp;&amp;) = delete</code></a>
    191. 

  191. <p>Disabling implicit constructor used to give useful diagnostic error when trying to use implicit constructors when <code>predicate::implicit_constructors_enabled</code> is false.</p><li>
    192. 

  192. 	<a href="../reference/types/basic_result/implicit_value_converting_constructor.html" ><code>basic_result(R &amp;&amp;)</code></a>
    193. 

  193. <p>Implicit <code>value_type</code> constructor. Available if <code>predicate::enable_value_converting_constructor&lt;R&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    194. 

  194. 	<a href="../reference/types/basic_result/implicit_error_converting_constructor.html" ><code>basic_result(S &amp;&amp;)</code></a>
    195. 

  195. <p>Implicit <code>error_type</code> constructor. Available if <code>predicate::enable_error_converting_constructor&lt;S&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    196. 

  196. 	<a href="../reference/types/basic_result/implicit_error_condition_converting_constructor.html" ><code>basic_result(ErrorCondEnum &amp;&amp;)</code></a>
    197. 

  197. <p>Implicit <code>error_type</code> from <code>ErrorCondEnum</code> constructor. Available if <code>predicate::enable_error_condition_converting_constructor&lt;ErrorCondEnum&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    198. 

  198. 	<a href="../reference/types/basic_result/explicit_valueorerror_converting_constructor.html" ><code>explicit basic_result(ValueOrError&lt;T, E&gt; &amp;&amp;)</code></a>
    199. 

  199. <p>Explicit converting constructor from <code>ValueOrError&lt;T, E&gt;</code> concept matching types. Available if <code>convert::value_or_error&lt;&gt;</code> permits it. Constexpr, triviality and noexcept propagating.</p><li>
    200. 

  200. 	<a href="../reference/types/basic_result/explicit_copy_converting_constructor.html" ><code>explicit basic_result(const basic_result&lt;R, S, P&gt; &amp;)</code></a>
    201. 

  201. <p>Explicit converting copy constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_compatible_conversion&lt;R, S, P&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    202. 

  202. 	<a href="../reference/types/basic_result/explicit_move_converting_constructor.html" ><code>explicit basic_result(basic_result&lt;R, S, P&gt; &amp;&amp;)</code></a>
    203. 

  203. <p>Explicit converting move constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_compatible_conversion&lt;R, S, P&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    204. 

  204. 	<a href="../reference/types/basic_result/explicit_make_error_code_copy_converting_constructor.html" ><code>explicit basic_result(const basic_result&lt;R, S, P&gt; &amp;)</code></a>
    205. 

  205. <p>Explicit converting copy constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_make_error_code_compatible_conversion&lt;R, S, P&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    206. 

  206. 	<a href="../reference/types/basic_result/explicit_make_error_code_move_converting_constructor.html" ><code>explicit basic_result(basic_result&lt;R, S, P&gt; &amp;&amp;)</code></a>
    207. 

  207. <p>Explicit converting move constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_make_error_code_compatible_conversion&lt;R, S, P&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    208. 

  208. 	<a href="../reference/types/basic_result/explicit_make_exception_ptr_copy_converting_constructor.html" ><code>explicit basic_result(const basic_result&lt;R, S, P&gt; &amp;)</code></a>
    209. 

  209. <p>Explicit converting copy constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_make_exception_ptr_compatible_conversion&lt;R, S, P&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    210. 

  210. 	<a href="../reference/types/basic_result/explicit_make_exception_ptr_move_converting_constructor.html" ><code>explicit basic_result(basic_result&lt;R, S, P&gt; &amp;&amp;)</code></a>
    211. 

  211. <p>Explicit converting move constructor from compatible <code>basic_result</code>. Available if <code>predicate::enable_make_exception_ptr_compatible_conversion&lt;R, S, P&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    212. 

  212. 	<a href="../reference/types/basic_result/explicit_inplace_value_constructor.html" ><code>explicit basic_result(in_place_type_t&lt;value_type_if_enabled&gt;, Args ...)</code></a>
    213. 

  213. <p>Explicit inplace value constructor. Available if <code>predicate::enable_inplace_value_constructor&lt;Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    214. 

  214. 	<a href="../reference/types/basic_result/explicit_inplace_value_constructor_il.html" ><code>explicit basic_result(in_place_type_t&lt;value_type_if_enabled&gt;, std::initializer_list&lt;U&gt;, Args ...)</code></a>
    215. 

  215. <p>Explicit inplace value constructor. Available if <code>predicate::enable_inplace_value_constructor&lt;std::initializer_list&lt;U&gt;, Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    216. 

  216. 	<a href="../reference/types/basic_result/explicit_inplace_error_constructor.html" ><code>explicit basic_result(in_place_type_t&lt;error_type_if_enabled&gt;, Args ...)</code></a>
    217. 

  217. <p>Explicit inplace error constructor. Available if <code>predicate::enable_inplace_error_constructor&lt;Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    218. 

  218. 	<a href="../reference/types/basic_result/explicit_inplace_error_constructor_il.html" ><code>explicit basic_result(in_place_type_t&lt;error_type_if_enabled&gt;, std::initializer_list&lt;U&gt;, Args ...)</code></a>
    219. 

  219. <p>Explicit inplace error constructor. Available if <code>predicate::enable_inplace_error_constructor&lt;std::initializer_list&lt;U&gt;, Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    220. 

  220. 	<a href="../reference/types/basic_result/implicit_inplace_value_error_constructor.html" ><code>basic_result(A1 &amp;&amp;, A2 &amp;&amp;, Args ...)</code></a>
    221. 

  221. <p>Implicit inplace value or error constructor. Available if <code>predicate::enable_inplace_value_error_constructor&lt;A1, A2, Args ...&gt;</code> is true. Constexpr, triviality and noexcept propagating.</p><li>
    222. 

  222. 	<a href="../reference/types/basic_result/implicit_success_copy_constructor.html" ><code>basic_result(const success_type&lt;T&gt; &amp;)</code></a>
    223. 

  223. <p>Implicit value-from-success-type-sugar copy constructor. Available if <code>predicate::enable_compatible_conversion&lt;T, void, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p><li>
    224. 

  224. 	<a href="../reference/types/basic_result/implicit_success_move_constructor.html" ><code>basic_result(success_type&lt;T&gt; &amp;&amp;)</code></a>
    225. 

  225. <p>Implicit value-from-success-type-sugar move constructor. Available if <code>predicate::enable_compatible_conversion&lt;T, void, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p><li>
    226. 

  226. 	<a href="../reference/types/basic_result/implicit_failure_copy_constructor.html" ><code>basic_result(const failure_type&lt;T&gt; &amp;)</code></a>
    227. 

  227. <p>Implicit error-from-failure-type-sugar copy constructor. Available if <code>predicate::enable_compatible_conversion&lt;void, T, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p><li>
    228. 

  228. 	<a href="../reference/types/basic_result/implicit_failure_move_constructor.html" ><code>basic_result(failure_type&lt;T&gt; &amp;&amp;)</code></a>
    229. 

  229. <p>Implicit error-from-failure-type-sugar move constructor. Available if <code>predicate::enable_compatible_conversion&lt;void, T, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p><li>
    230. 

  230. 	<a href="../reference/types/basic_result/implicit_failure_make_error_code_copy_constructor.html" ><code>basic_result(const failure_type&lt;T&gt; &amp;)</code></a>
    231. 

  231. <p>Implicit error-from-failure-type-sugar copy constructor. Available if <code>predicate::enable_make_error_code_compatible_conversion&lt;void, T, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p><li>
    232. 

  232. 	<a href="../reference/types/basic_result/implicit_failure_make_error_code_move_constructor.html" ><code>basic_result(failure_type&lt;T&gt; &amp;&amp;)</code></a>
    233. 

  233. <p>Implicit error-from-failure-type-sugar move constructor. Available if <code>predicate::enable_make_error_code_compatible_conversion&lt;void, T, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p><li>
    234. 

  234. 	<a href="../reference/types/basic_result/implicit_failure_make_exception_ptr_copy_constructor.html" ><code>basic_result(const failure_type&lt;T&gt; &amp;)</code></a>
    235. 

  235. <p>Implicit error-from-failure-type-sugar copy constructor. Available if <code>predicate::enable_make_exception_ptr_compatible_conversion&lt;void, T, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p><li>
    236. 

  236. 	<a href="../reference/types/basic_result/implicit_failure_make_exception_ptr_move_constructor.html" ><code>basic_result(failure_type&lt;T&gt; &amp;&amp;)</code></a>
    237. 

  237. <p>Implicit error-from-failure-type-sugar move constructor. Available if <code>predicate::enable_make_exception_ptr_compatible_conversion&lt;void, T, void&gt;</code> is true, or <code>T</code> is <code>void</code>. Constexpr, triviality and noexcept propagating.</p><li>
    238. 

  238. 	<a href="../reference/types/basic_result/operator_bool.html" ><code>explicit operator bool() const noexcept</code></a>
    239. 

  239. <p>Returns true if a value is present. Constexpr, never throws.</p><li>
    240. 

  240. 	<a href="../reference/types/basic_result/has_value.html" ><code>bool has_value() const noexcept</code></a>
    241. 

  241. <p>Returns true if a value is present. Constexpr, never throws.</p><li>
    242. 

  242. 	<a href="../reference/types/basic_result/has_error.html" ><code>bool has_error() const noexcept</code></a>
    243. 

  243. <p>Returns true if an error is present. Constexpr, never throws.</p><li>
    244. 

  244. 	<a href="../reference/types/basic_result/has_exception.html" ><code>bool has_exception() const noexcept</code></a>
    245. 

  245. <p>Always returns false for <code>basic_result</code>. Constexpr, never throws.</p><li>
    246. 

  246. 	<a href="../reference/types/basic_result/has_failure.html" ><code>bool has_failure() const noexcept</code></a>
    247. 

  247. <p>Returns true if there is either an error or an exception. Constexpr, never throws.</p><li>
    248. 

  248. 	<a href="../reference/types/basic_result/has_lost_consistency.html" ><code>bool has_lost_consistency() const noexcept</code></a>
    249. 

  249. <p>Returns true if a preceding swap involving this object failed to preserve the strong guarantee. Constexpr, never throws.</p><li>
    250. 

  250. 	<a href="../reference/types/basic_result/assume_value_lvalue.html" ><code>value_type &amp;assume_value() &amp; noexcept</code></a>
    251. 

  251. <p>Narrow contract lvalue reference observer of any value present. Constexpr propagating, never throws.</p><li>
    252. 

  252. 	<a href="../reference/types/basic_result/assume_value_lvalue_const.html" ><code>const value_type &amp;assume_value() const &amp; noexcept</code></a>
    253. 

  253. <p>Narrow contract const lvalue reference observer of any value present. Constexpr propagating, never throws.</p><li>
    254. 

  254. 	<a href="../reference/types/basic_result/assume_value_rvalue.html" ><code>value_type &amp;&amp;assume_value() &amp;&amp; noexcept</code></a>
    255. 

  255. <p>Narrow contract rvalue reference observer of any value present. Constexpr propagating, never throws.</p><li>
    256. 

  256. 	<a href="../reference/types/basic_result/assume_value_rvalue_const.html" ><code>const value_type &amp;&amp;assume_value() const &amp;&amp; noexcept</code></a>
    257. 

  257. <p>Narrow contract const rvalue reference observer of any value present. Constexpr propagating, never throws.</p><li>
    258. 

  258. 	<a href="../reference/types/basic_result/value_lvalue.html" ><code>value_type &amp;value() &amp;</code></a>
    259. 

  259. <p>Wide contract lvalue reference observer of any value present. Constexpr propagating.</p><li>
    260. 

  260. 	<a href="../reference/types/basic_result/value_lvalue_const.html" ><code>const value_type &amp;value() const &amp;</code></a>
    261. 

  261. <p>Wide contract const lvalue reference observer of any value present. Constexpr propagating.</p><li>
    262. 

  262. 	<a href="../reference/types/basic_result/value_rvalue.html" ><code>value_type &amp;&amp;value() &amp;&amp;</code></a>
    263. 

  263. <p>Wide contract rvalue reference observer of any value present. Constexpr propagating.</p><li>
    264. 

  264. 	<a href="../reference/types/basic_result/value_rvalue_const.html" ><code>const value_type &amp;&amp;value() const &amp;&amp;</code></a>
    265. 

  265. <p>Wide contract const rvalue reference observer of any value present. Constexpr propagating.</p><li>
    266. 

  266. 	<a href="../reference/types/basic_result/assume_error_lvalue.html" ><code>error_type &amp;assume_error() &amp; noexcept</code></a>
    267. 

  267. <p>Narrow contract lvalue reference observer of the stored error. Constexpr propagating, never throws.</p><li>
    268. 

  268. 	<a href="../reference/types/basic_result/assume_error_lvalue_const.html" ><code>const error_type &amp;assume_error() const &amp; noexcept</code></a>
    269. 

  269. <p>Narrow contract const lvalue reference observer of the stored error. Constexpr propagating, never throws.</p><li>
    270. 

  270. 	<a href="../reference/types/basic_result/assume_error_rvalue.html" ><code>error_type &amp;&amp;assume_error() &amp;&amp; noexcept</code></a>
    271. 

  271. <p>Narrow contract rvalue reference observer of the stored error. Constexpr propagating, never throws.</p><li>
    272. 

  272. 	<a href="../reference/types/basic_result/assume_error_rvalue_const.html" ><code>const error_type &amp;&amp;assume_error() const &amp;&amp; noexcept</code></a>
    273. 

  273. <p>Narrow contract const rvalue reference observer of the stored error. Constexpr propagating, never throws.</p><li>
    274. 

  274. 	<a href="../reference/types/basic_result/error_lvalue.html" ><code>error_type &amp;error() &amp;</code></a>
    275. 

  275. <p>Wide contract lvalue reference observer of the stored error. Constexpr propagating.</p><li>
    276. 

  276. 	<a href="../reference/types/basic_result/error_lvalue_const.html" ><code>const error_type &amp;error() const &amp;</code></a>
    277. 

  277. <p>Wide contract const lvalue reference observer of the stored error. Constexpr propagating.</p><li>
    278. 

  278. 	<a href="../reference/types/basic_result/error_rvalue.html" ><code>error_type &amp;&amp;error() &amp;&amp;</code></a>
    279. 

  279. <p>Wide contract rvalue reference observer of the stored error. Constexpr propagating.</p><li>
    280. 

  280. 	<a href="../reference/types/basic_result/error_rvalue_const.html" ><code>const error_type &amp;&amp;error() const &amp;&amp;</code></a>
    281. 

  281. <p>Wide contract const rvalue reference observer of the stored error. Constexpr propagating.</p><li>
    282. 

  282. 	<a href="../reference/types/basic_result/equality_basic_result.html" ><code>bool operator==(const basic_result&lt;A, B, C&gt; &amp;) const</code></a>
    283. 

  283. <p>Returns true if this result compares equal to the other result. Constexpr and noexcept propagating.</p><li>
    284. 

  284. 	<a href="../reference/types/basic_result/inequality_success_type.html" ><code>bool operator==(const success_type&lt;A&gt; &amp;) const</code></a>
    285. 

  285. <p>Returns true if this result compares equal to the success type sugar. Constexpr and noexcept propagating.</p><li>
    286. 

  286. 	<a href="../reference/types/basic_result/equality_failure_type.html" ><code>bool operator==(const failure_type&lt;A, void&gt; &amp;) const</code></a>
    287. 

  287. <p>Returns true if this result compares equal to the failure type sugar. Constexpr and noexcept propagating.</p><li>
    288. 

  288. 	<a href="../reference/types/basic_result/inequality_basic_result.html" ><code>bool operator!=(const basic_result&lt;A, B, C&gt; &amp;) const</code></a>
    289. 

  289. <p>Returns true if this result does not compare equal to the other result. Constexpr and noexcept propagating.</p><li>
    290. 

  290. 	<a href="../reference/types/basic_result/equality_success_type.html" ><code>bool operator!=(const success_type&lt;A&gt; &amp;) const</code></a>
    291. 

  291. <p>Returns true if this result does not compare equal to the success type sugar. Constexpr and noexcept propagating.</p><li>
    292. 

  292. 	<a href="../reference/types/basic_result/inequality_failure_type.html" ><code>bool operator!=(const failure_type&lt;A, void&gt; &amp;) const</code></a>
    293. 

  293. <p>Returns true if this result does not compare equal to the failure type sugar. Constexpr and noexcept propagating.</p><li>
    294. 

  294. 	<a href="../reference/types/basic_result/swap.html" ><code>void swap(basic_result &amp;)</code></a>
    295. 

  295. <p>Swap one basic_result with another, with the strong guarantee. Noexcept propagating.</p><li>
    296. 

  296. 	<a href="../reference/types/basic_result/as_failure_lvalue.html" ><code>auto as_failure() const &amp;</code></a>
    297. 

  297. <p>Return the output from free function <code>failure()</code> containing a copy of any errored state.</p><li>
    298. 

  298. 	<a href="../reference/types/basic_result/as_failure_rvalue.html" ><code>auto as_failure() &amp;&amp;</code></a>
    299. 

  299. <p>Return the output from free function <code>failure()</code> containing a move of any errored state.</p></li></ol><li>
    300. 

  300. 	<a href="../reference/types/bad_outcome_access.html" ><code>bad_outcome_access</code></a>
    301. 

  301. <p>Exception type publicly inheriting from <code>std::logic_error</code> indicating an incorrect observation of value or error or exception occurred.</p><li>
    302. 

  302. 	<a href="../reference/types/bad_result_access_with.html" ><code>bad_result_access_with&lt;EC&gt;</code></a>
    303. 

  303. <p>Exception type publicly inheriting from <code>bad_result_access</code> indicating an incorrect observation of value occurred, supplying the error value.</p><li>
    304. 

  304. 	<a href="../reference/types/bad_result_access.html" ><code>bad_result_access</code></a>
    305. 

  305. <p>Exception type publicly inheriting from <code>std::logic_error</code> indicating an incorrect observation of value or error occurred.</p><li>
    306. 

  306. 	<a href="../reference/types/failure_type.html" ><code>failure_type&lt;EC, EP = void&gt;</code></a>
    307. 

  307. <p>Type sugar for constructing an unsuccessful result or outcome.</p><li>
    308. 

  308. 	<a href="../reference/types/in_place_type_t.html" ><code>in_place_type_t&lt;T&gt;</code></a>
    309. 

  309. <p>Either <code>std::in_place_type_t&lt;T&gt;</code> or a local emulation, depending on the <code>BOOST_OUTCOME_USE_STD_IN_PLACE_TYPE</code> macro.</p><li>
    310. 

  310. 	<a href="../reference/types/success_type.html" ><code>success_type&lt;T&gt;</code></a>
    311. 

  311. <p>Type sugar for constructing a successful result or outcome.</p></li></ol>
    312. 

  312. 

  313. 

  314. 

  315. 

  316. 

  317. 

  318. 

  319. 

  320.         </div><p><small>Last revised: December 13, 2018 at 21:10:19 UTC</small></p>
    321. 

  321. <hr>
    322. 

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    323. 

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