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  3. <title>Policies - Boost.Outcome documentation</title>
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  13. 

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

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

  16. 	<a href="../reference/policies/base.html" ><code>base</code></a>
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  17. <p>Base class of most policy classes defining the narrow observer policies.</p><ol><li>
    18. 

  18. 	<a href="../reference/policies/base/ub.html" ><code>static void _ub(Impl &amp;&amp;)</code></a>
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  19. <p>Special function which causes noticeable hard undefined behaviour.</p><li>
    20. 

  20. 	<a href="../reference/policies/base/has_value.html" ><code>static bool _has_value(Impl &amp;&amp;) noexcept</code></a>
    21. 

  21. <p>Returns true if a value is present in the implementation passed in. Constexpr, never throws.</p><li>
    22. 

  22. 	<a href="../reference/policies/base/has_error.html" ><code>static bool _has_error(Impl &amp;&amp;) noexcept</code></a>
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  23. <p>Returns true if an error is present in the implementation passed in. Constexpr, never throws.</p><li>
    24. 

  24. 	<a href="../reference/policies/base/has_exception.html" ><code>static bool _has_exception(Impl &amp;&amp;) noexcept</code></a>
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  25. <p>Returns true if an exception is present in the implementation passed in. Constexpr, never throws.</p><li>
    26. 

  26. 	<a href="../reference/policies/base/has_error_is_errno.html" ><code>static bool _has_error_is_errno(Impl &amp;&amp;) noexcept</code></a>
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  27. <p>Returns true if the error code in the implementation passed in has a domain or category matching that of POSIX <code>errno</code>. Constexpr, never throws.</p><li>
    28. 

  28. 	<a href="../reference/policies/base/value.html" ><code>static auto &amp;&amp;_value(Impl &amp;&amp;) noexcept</code></a>
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  29. <p>Returns a reference to the value in the implementation passed in. Constexpr, never throws.</p><li>
    30. 

  30. 	<a href="../reference/policies/base/error.html" ><code>static auto &amp;&amp;_error(Impl &amp;&amp;) noexcept</code></a>
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  31. <p>Returns a reference to the error in the implementation passed in. Constexpr, never throws.</p><li>
    32. 

  32. 	<a href="../reference/policies/base/exception.html" ><code>static auto &amp;&amp;_exception(Impl &amp;&amp;) noexcept</code></a>
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  33. <p>Returns a reference to the exception in the implementation passed in. Constexpr, never throws.</p><li>
    34. 

  34. 	<a href="../reference/policies/base/set_has_value.html" ><code>static void _set_has_value(Impl &amp;&amp;, bool) noexcept</code></a>
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  35. <p>Sets whether the implementation has a value. Constexpr, never throws.</p><li>
    36. 

  36. 	<a href="../reference/policies/base/set_has_error.html" ><code>static void _set_has_error(Impl &amp;&amp;, bool) noexcept</code></a>
    37. 

  37. <p>Sets whether the implementation has an error. Constexpr, never throws.</p><li>
    38. 

  38. 	<a href="../reference/policies/base/set_has_exception.html" ><code>static void _set_has_exception(Impl &amp;&amp;, bool) noexcept</code></a>
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  39. <p>Sets whether the implementation has an exception. Constexpr, never throws.</p><li>
    40. 

  40. 	<a href="../reference/policies/base/set_has_error_is_errno.html" ><code>static void _set_has_exception(Impl &amp;&amp;, bool) noexcept</code></a>
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  41. <p>Sets whether the implementation&rsquo;s error code has a domain or category matching that of POSIX <code>errno</code>. Constexpr, never throws.</p><li>
    42. 

  42. 	<a href="../reference/policies/base/narrow_value_check.html" ><code>static void narrow_value_check(Impl &amp;&amp;) noexcept</code></a>
    43. 

  43. <p>Observer policy performing hard UB if no value is present. Constexpr, never throws.</p><li>
    44. 

  44. 	<a href="../reference/policies/base/narrow_error_check.html" ><code>static void narrow_error_check(Impl &amp;&amp;) noexcept</code></a>
    45. 

  45. <p>Observer policy performing hard UB if no error is present. Constexpr, never throws.</p><li>
    46. 

  46. 	<a href="../reference/policies/base/narrow_exception_check.html" ><code>static void narrow_exception_check(Impl &amp;&amp;) noexcept</code></a>
    47. 

  47. <p>Observer policy performing hard UB if no exception is present. Constexpr, never throws.</p></li></ol><li>
    48. 

  48. 	<a href="../reference/policies/all_narrow.html" ><code>all_narrow</code></a>
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  49. <p>Policy class defining that hard undefined behaviour should occur on incorrect narrow and wide value, error or exception observation. Inherits publicly from <code>base</code>.</p><li>
    50. 

  50. 	<a href="../reference/policies/error_code_throw_as_system_error_outcome.html" ><code>error_code_throw_as_system_error&lt;T, EC, EP&gt;</code></a>
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  51. <p>Policy class defining that <code>EP</code> ought to be rethrown if possible, then the ADL discovered free function <code>outcome_throw_as_system_error_with_payload()</code> should be called on incorrect wide value observation. Inherits publicly from <code>base</code>. Can only be used with <code>basic_outcome</code>.</p><li>
    52. 

  52. 	<a href="../reference/policies/error_code_throw_as_system_error_result.html" ><code>error_code_throw_as_system_error&lt;T, EC, void&gt;</code></a>
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  53. <p>Policy class defining that the ADL discovered free function <code>outcome_throw_as_system_error_with_payload()</code> should be called on incorrect wide value observation. Inherits publicly from <code>base</code>. Can only be used with <code>basic_result</code>.</p><li>
    54. 

  54. 	<a href="../reference/policies/exception_ptr_rethrow_outcome.html" ><code>exception_ptr_rethrow&lt;T, EC, EP&gt;</code></a>
    55. 

  55. <p>Policy class defining that the ADL discovered free function <code>rethrow_exception()</code> should be called on incorrect wide value observation. Inherits publicly from <code>base</code>. Can only be used with <code>basic_outcome</code>.</p><li>
    56. 

  56. 	<a href="../reference/policies/exception_ptr_rethrow_result.html" ><code>exception_ptr_rethrow&lt;T, EC, void&gt;</code></a>
    57. 

  57. <p>Policy class defining that the ADL discovered free function <code>rethrow_exception()</code> should be called on incorrect wide value observation. Inherits publicly from <code>base</code>. Can only be used with <code>basic_result</code>.</p><li>
    58. 

  58. 	<a href="../reference/policies/fail_to_compile_observers.html" ><code>fail_to_compile_observers</code></a>
    59. 

  59. <p>Policy class defining that a static assertion should occur upon compilation of the wide value, error or exception observation. Inherits publicly from <code>base</code>.</p><li>
    60. 

  60. 	<a href="../reference/policies/terminate.html" ><code>terminate</code></a>
    61. 

  61. <p>Policy class defining that <code>std::terminate()</code> should be called on incorrect wide value, error or exception observation. Inherits publicly from <code>base</code>.</p><li>
    62. 

  62. 	<a href="../reference/policies/throw_bad_result_access.html" ><code>throw_bad_result_access&lt;EC&gt;</code></a>
    63. 

  63. <p>Policy class defining that <code>bad_result_access_with&lt;EC&gt;</code> should be thrown on incorrect wide value observation. Inherits publicly from <code>base</code>.</p></li></ol>
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  72.         </div><p><small>Last revised: December 13, 2018 at 21:10:19 UTC</small></p>
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