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is_error_type.html

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  3. <title>is_error_type&lt;E&gt; - Boost.Outcome documentation</title>
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  13.   <div class="titlepage"><div><div><h1 style="clear: both"><code>is_error_type&lt;E&gt;</code></h1></div></div></div>
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  14.   <p>A customisable integral constant type true for <code>E</code> types which are to receive
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  15. error throwing no-value policies. Special weakened implicit construction enable
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  16. is available for integral <code>T</code> types when combined with <code>E</code> types in this
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  17. whitelist &ndash; this permits <code>boost_result&lt;int, boost::system::errc::errc_t</code> to
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  18. retain its implicit constructors, despite the fact that <code>errc_t</code> as a C enum
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  19. has an implicit conversion to <code>int</code>.</p>
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  20. 

  21. <p><em>Overridable</em>: By template specialisation into the <code>trait</code> namespace.</p>
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  22. 

  23. <p><em>Default</em>: False. Specialisations to true exist for:</p>
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  24. 

  25. <ul>
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  26. <li><p><code>&lt;boost/outcome/boost_result.hpp&gt;</code></p>
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  27. 

  28. <ul>
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  29. <li><code>boost::system::error_code</code></li>
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  30. <li><code>boost::system::errc::errc_t</code></li>
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  31. <li><code>boost::exception_ptr</code></li>
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  32. </ul></li>
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  33. 

  34. <li><p><code>&lt;boost/outcome/std_result.hpp&gt;</code></p>
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  35. 

  36. <ul>
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  37. <li><code>std::error_code</code></li>
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  38. <li><code>std::errc</code></li>
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  39. <li><code>std::exception_ptr</code></li>
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  40. </ul></li>
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  41. </ul>
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  42. 

  43. <p><em>Namespace</em>: <code>BOOST_OUTCOME_V2_NAMESPACE::trait</code></p>
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  44. 

  45. <p><em>Header</em>: <code>&lt;boost/outcome/trait.hpp&gt;</code></p>
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  46. 

  47. 

  48.         </div><p><small>Last revised: October 11, 2019 at 17:03:05 &#43;0100</small></p>
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