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type_traits_design.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<!-- Material used from: HTML 4.01 specs: http://www.w3.org/TR/html401/ -->
<html>
<head>
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<title>type traits intrinsic design</title>
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<body>
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<div>
<a href="https://llvm.org/">LLVM Home</a>
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<label>libc++ Info</label>
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<div id="content">
<!--*********************************************************************-->
<h1>Type traits intrinsic design</h1>
<!--*********************************************************************-->
<p>
This is a survey of the type traits intrinsics clang has, and those needed.
The names and definitions of several of the needed type traits has recently
changed. Please see:
<a href="https://wg21.link/n3142">N3142</a>.
</p>
<blockquote>
<table border="1">
<caption>Legend</caption>
<tr>
<td>clang supplies it and it is absolutely necessary</td>
<td bgcolor="#80FF80"><tt>some_trait(T)</tt></td>
</tr>
<tr>
<td>clang supplies it and it is useful</td>
<td bgcolor="#96B9FF"><tt>some_trait(T)</tt></td>
</tr>
<tr>
<td>clang supplies it and it is not needed</td>
<td><tt>some_trait(T)</tt></td>
</tr>
<tr>
<td>clang does not supply it and it is not needed</td>
<td></td>
</tr>
<tr>
<td>clang does not supply it and it is absolutely necessary</td>
<td bgcolor="#FF5965"><tt>some_trait(T)</tt></td>
</tr>
</table>
<p></p>
<table border="1">
<caption>Needed type traits vs clang type traits</caption>
<tr>
<th>libc++ Needs</th>
<th>clang Has</th>
</tr>
<tr>
<td><tt>is_union<T></tt></td>
<td bgcolor="#80FF80"><tt>__is_union(T)</tt></td>
</tr>
<tr>
<td><tt>is_class<T></tt></td>
<td bgcolor="#96B9FF"><tt>__is_class(T)</tt></td>
</tr>
<tr>
<td><tt>is_enum<T></tt></td>
<td bgcolor="#96B9FF"><tt>__is_enum(T)</tt></td>
</tr>
<tr>
<td><tt>is_pod<T></tt></td>
<td bgcolor="#80FF80"><tt>__is_pod(T)</tt></td>
</tr>
<tr>
<td><tt>has_virtual_destructor<T></tt></td>
<td bgcolor="#80FF80"><tt>__has_virtual_destructor(T)</tt></td>
</tr>
<tr>
<td><tt>is_constructible<T, Args...></tt></td>
<td></td>
</tr>
<tr>
<td><tt>is_default_constructible<T></tt></td>
<td></td>
</tr>
<tr>
<td><tt>is_copy_constructible<T></tt></td>
<td></td>
</tr>
<tr>
<td><tt>is_move_constructible<T></tt></td>
<td></td>
</tr>
<tr>
<td><tt>is_assignable<T, U></tt></td>
<td></td>
</tr>
<tr>
<td><tt>is_copy_assignable<T></tt></td>
<td></td>
</tr>
<tr>
<td><tt>is_move_assignable<T></tt></td>
<td></td>
</tr>
<tr>
<td><tt>is_destructible<T></tt></td>
<td></td>
</tr>
<tr>
<td><tt>is_trivially_constructible<T, Args...></tt></td>
<td bgcolor="#80FF80"><tt>__is_trivially_constructible(T, U)</tt></td>
</tr>
<tr>
<td><tt>is_trivially_default_constructible<T></tt></td>
<td bgcolor="#80FF80"><tt>__has_trivial_constructor(T)</tt></td>
</tr>
<tr>
<td><tt>is_trivially_copy_constructible<T></tt></td>
<td><tt>__has_trivial_copy(T)</tt></td>
</tr>
<tr>
<td><tt>is_trivially_move_constructible<T></tt></td>
<td></td>
</tr>
<tr>
<td><tt>is_trivially_assignable<T, U></tt></td>
<td bgcolor="#80FF80"><tt>__is_trivially_assignable(T, U)</tt></td>
</tr>
<tr>
<td><tt>is_trivially_copy_assignable<T></tt></td>
<td><tt>__has_trivial_assign(T)</tt></td>
</tr>
<tr>
<td><tt>is_trivially_move_assignable<T></tt></td>
<td></td>
</tr>
<tr>
<td><tt>is_trivially_destructible<T></tt></td>
<td bgcolor="#80FF80"><tt>__has_trivial_destructor(T)</tt></td>
</tr>
<tr>
<td><tt>is_nothrow_constructible<T, Args...></tt></td>
<td></td>
</tr>
<tr>
<td><tt>is_nothrow_default_constructible<T></tt></td>
<td><tt>__has_nothrow_constructor(T)</tt></td>
</tr>
<tr>
<td><tt>is_nothrow_copy_constructible<T></tt></td>
<td><tt>__has_nothrow_copy(T)</tt></td>
</tr>
<tr>
<td><tt>is_nothrow_move_constructible<T></tt></td>
<td></td>
</tr>
<tr>
<td><tt>is_nothrow_assignable<T, U></tt></td>
<td></td>
</tr>
<tr>
<td><tt>is_nothrow_copy_assignable<T></tt></td>
<td><tt>__has_nothrow_assign(T)</tt></td>
</tr>
<tr>
<td><tt>is_nothrow_move_assignable<T></tt></td>
<td></td>
</tr>
<tr>
<td><tt>is_nothrow_destructible<T></tt></td>
<td></td>
</tr>
<tr>
<td><tt>is_trivial<T></tt></td>
<td bgcolor="#80FF80"><tt>__is_trivial(T)</tt></td>
</tr>
<tr>
<td><tt>is_trivially_copyable<T></tt></td>
<td bgcolor="#80FF80"><tt>__is_trivially_copyable(T)</tt></td>
</tr>
<tr>
<td><tt>is_standard_layout<T></tt></td>
<td bgcolor="#80FF80"><tt>__is_standard_layout(T)</tt></td>
</tr>
<tr>
<td><tt>is_literal_type<T></tt></td>
<td bgcolor="#80FF80"><tt>__is_literal_type(T)</tt></td>
</tr>
<tr>
<td><tt>is_convertible<T, U></tt></td>
<td bgcolor="#80FF80"><tt>__is_convertible_to(T, U)</tt></td>
</tr>
<tr>
<td><tt>is_base_of<T, U></tt></td>
<td bgcolor="#80FF80"><tt>__is_base_of(T, U)</tt></td>
</tr>
<tr>
<td><tt>underlying_type<T></tt></td>
<td bgcolor="#80FF80"><tt>__underlying_type(T)</tt></td>
</tr>
<tr>
<td><tt>is_polymorphic<T></tt></td>
<td><tt>__is_polymorphic(T)</tt></td>
</tr>
<tr>
<td><tt>is_empty<T></tt></td>
<td><tt>__is_empty(T)</tt></td>
</tr>
<tr>
<td><tt>is_abstract<T></tt></td>
<td><tt>__is_abstract(T)</tt></td>
</tr>
</table>
</blockquote>
</div>
</body>
</html>