trivially-copyable optional<T> for trivial T

This commit is contained in:
Andrzej Krzemienski
2017-10-28 16:51:13 +02:00
parent e95f9fc254
commit 2d2c3c3f6f
9 changed files with 826 additions and 21 deletions

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</h2></div></div></div>
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<span class="phrase"><a name="boost_optional.relnotes.boost_release_1_66"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_66">Boost
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">
On newer compilers <code class="computeroutput"><span class="identifier">optional</span></code>
is now trivially-copyable for trivial <code class="computeroutput"><span class="identifier">T</span></code>s.
This uses a different storage (just <code class="computeroutput"><span class="identifier">T</span></code>
rather than <code class="computeroutput"><span class="identifier">aligned_storage</span></code>).
We require the compiler to support defaulted functions and type traits.
Otherwise, we still use the the plain storage for scalar types.
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<span class="phrase"><a name="boost_optional.relnotes.boost_release_1_63"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_63">Boost
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Fixed <a href="https://svn.boost.org/trac/boost/ticket/12179" target="_top">Trac #12179</a>.
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#11203</a>.
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<span class="phrase"><a name="boost_optional.relnotes.boost_release_1_59"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_59">Boost
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<span class="phrase"><a name="boost_optional.relnotes.boost_release_1_58"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_58">Boost
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to fix C++03 compile error on <code class="computeroutput"><span class="identifier">logic_error</span><span class="special">(</span><span class="string">"..."</span><span class="special">)</span></code>"</em></span>.
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<span class="phrase"><a name="boost_optional.relnotes.boost_release_1_56"></a></span><a class="link" href="relnotes.html#boost_optional.relnotes.boost_release_1_56">Boost
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