type_traits intrinsics design
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Howard Hinnant
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<ul>
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<li><a href="atomic_design.html"><tt><atomic></tt></a></li>
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<li><a href="type_traits_design.html"><tt><type_traits></tt></a></li>
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</ul>
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<title>type traits intrinsic design</title>
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<div id="content">
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<!--*********************************************************************-->
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<h1>Type traits intrinsic design</h1>
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<!--*********************************************************************-->
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<p>
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This is a survey of the type traits intrinsics clang has, and those needed.
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The names and definitions of several of the needed type traits has recently
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changed. Please see:
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<a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3142.html">N3142</a>.
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</p>
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<blockquote>
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<table border="1">
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<caption>Legend</caption>
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<tr>
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<td>clang supplies it and it is absolutely necessary</td>
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<td bgcolor="#80FF80"><tt>some_trait(T)</tt></td>
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</tr>
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<tr>
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<td>clang supplies it and it is useful</td>
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<td bgcolor="#96B9FF"><tt>some_trait(T)</tt></td>
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</tr>
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<tr>
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<td>clang supplies it and it is not needed</td>
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<td><tt>some_trait(T)</tt></td>
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</tr>
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<tr>
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<td>clang does not supply it and it is not needed</td>
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<td></td>
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</tr>
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<tr>
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<td>clang does not supply it and it is absolutely necessary</td>
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<td bgcolor="#FF5965"><tt>some_trait(T)</tt></td>
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</tr>
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</table>
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<p></p>
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<table border="1">
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<caption>Needed type traits vs clang type traits</caption>
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<tr>
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<th>libc++ Needs</th>
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<th>clang Has</th>
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</tr>
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<tr>
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<td><tt>is_union<T></tt></td>
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<td bgcolor="#80FF80"><tt>__is_union(T)</tt></td>
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</tr>
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<tr>
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<td><tt>is_class<T></tt></td>
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<td bgcolor="#96B9FF"><tt>__is_class(T)</tt></td>
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</tr>
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<tr>
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<td><tt>is_enum<T></tt></td>
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<td bgcolor="#96B9FF"><tt>__is_enum(T)</tt></td>
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</tr>
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<tr>
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<td><tt>is_pod<T></tt></td>
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<td bgcolor="#80FF80"><tt>__is_pod(T)</tt></td>
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</tr>
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<tr>
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<td><tt>has_virtual_destructor<T></tt></td>
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<td bgcolor="#80FF80"><tt>__has_virtual_destructor(T)</tt></td>
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</tr>
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<tr>
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<td><tt>is_constructible<T, Args...></tt></td>
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<td bgcolor="#FF5965"><tt>__is_constructible(T, Args...)</tt></td>
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</tr>
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<tr>
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<td><tt>is_default_constructible<T></tt></td>
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<td></td>
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</tr>
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<tr>
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<td><tt>is_copy_constructible<T></tt></td>
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<td></td>
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</tr>
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<tr>
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<td><tt>is_move_constructible<T></tt></td>
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<td></td>
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</tr>
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<tr>
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<td><tt>is_assignable<T, U></tt></td>
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<td bgcolor="#FF5965"><tt>__is_assignable(T, U)</tt></td>
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</tr>
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<tr>
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<td><tt>is_copy_assignable<T></tt></td>
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<td></td>
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</tr>
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<tr>
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<td><tt>is_move_assignable<T></tt></td>
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<td></td>
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</tr>
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<tr>
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<td><tt>is_destructible<T></tt></td>
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<td bgcolor="#FF5965"><tt>__is_destructible(T)</tt></td>
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</tr>
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<tr>
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<td><tt>is_trivially_constructible<T, Args...></tt></td>
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<td bgcolor="#FF5965"><tt>__is_trivially_constructible(T, Args...)</tt></td>
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</tr>
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<tr>
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<td><tt>is_trivially_default_constructible<T></tt></td>
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<td><tt>__has_trivial_constructor(T)</tt></td>
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</tr>
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<tr>
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<td><tt>is_trivially_copy_constructible<T></tt></td>
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<td><tt>__has_trivial_copy(T)</tt></td>
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</tr>
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<tr>
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<td><tt>is_trivially_move_constructible<T></tt></td>
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<td></td>
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</tr>
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<tr>
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<td><tt>is_trivially_assignable<T, U></tt></td>
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<td bgcolor="#FF5965"><tt>__is_trivially_assignable(T, U)</tt></td>
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</tr>
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<tr>
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<td><tt>is_trivially_copy_assignable<T></tt></td>
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<td><tt>__has_trivial_assign(T)</tt></td>
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</tr>
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<tr>
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<td><tt>is_trivially_move_assignable<T></tt></td>
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<td></td>
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</tr>
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<tr>
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<td><tt>is_trivially_destructible<T></tt></td>
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<td bgcolor="#80FF80"><tt>__has_trivial_destructor(T)</tt></td>
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</tr>
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<tr>
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<td><tt>is_nothrow_constructible<T, Args...></tt></td>
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<td bgcolor="#FF5965"><tt>__is_nothrow_constructible(T, Args...)</tt></td>
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</tr>
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<tr>
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<td><tt>is_nothrow_default_constructible<T></tt></td>
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<td><tt>__has_nothrow_constructor(T)</tt></td>
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</tr>
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<tr>
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<td><tt>is_nothrow_copy_constructible<T></tt></td>
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<td><tt>__has_nothrow_copy(T)</tt></td>
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</tr>
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<tr>
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<td><tt>is_nothrow_move_constructible<T></tt></td>
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<td></td>
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</tr>
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<tr>
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<td><tt>is_nothrow_assignable<T, U></tt></td>
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<td bgcolor="#FF5965"><tt>__is_nothrow_assignable(T, U)</tt></td>
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</tr>
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<tr>
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<td><tt>is_nothrow_copy_assignable<T></tt></td>
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<td><tt>__has_nothrow_assign(T)</tt></td>
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</tr>
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<tr>
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<td><tt>is_nothrow_move_assignable<T></tt></td>
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<td></td>
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</tr>
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<tr>
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<td><tt>is_nothrow_destructible<T></tt></td>
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<td bgcolor="#FF5965"><tt>__is_nothrow_destructible(T)</tt></td>
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</tr>
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</table>
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</blockquote>
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</div>
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