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Implement LWG issue 2301: Mark std::tie as constexpr 

llvm-svn: 202158
This commit is contained in:
Marshall Clow 2014-02-25 16:11:46 +00:00
parent 6d6e87be9f
commit 0d1560e10e
3 changed files with 12 additions and 3 deletions
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4
libcxx/include/tuple
View File

@ -74,7 +74,7 @@ const unspecified ignore;
template <class... T> tuple<V...> make_tuple(T&&...); // constexpr in C++14
template <class... T> tuple<ATypes...> forward_as_tuple(T&&...) noexcept; // constexpr in C++14
template <class... T> tuple<T&...> tie(T&...) noexcept;
template <class... T> tuple<T&...> tie(T&...) noexcept; // constexpr in C++14
template <class... Tuples> tuple<CTypes...> tuple_cat(Tuples&&... tpls); // constexpr in C++14
// 20.4.1.4, tuple helper classes:
@ -796,7 +796,7 @@ constexpr _T1&& get(tuple<_Args...>&& __tup) noexcept
// tie
template <class ..._Tp>
inline _LIBCPP_INLINE_VISIBILITY
inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX11
tuple<_Tp&...>
tie(_Tp&... __t) _NOEXCEPT
{

9
libcxx/test/utilities/tuple/tuple.tuple/tuple.creation/tie.pass.cpp
View File

@ -27,4 +27,13 @@ int main()
assert(i == 42);
assert(s == "C++");
}
#if _LIBCPP_STD_VER > 11
{
static constexpr int i = 42;
static constexpr double f = 1.1;
constexpr std::tuple<const int &, const double &> t = std::tie(i, f);
static_assert ( std::get<0>(t) == 42, "" );
static_assert ( std::get<1>(t) == 1.1, "" );
}
#endif
}

2
libcxx/www/cxx1y_status.html
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@ -240,7 +240,7 @@
<tr><td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2258">2258</a></td><td>a.erase(q1, q2) unable to directly return q2</td><td>Issaquah</td><td>Complete</td></tr>
<tr><td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2263">2263</a></td><td>Comparing iterators and allocator pointers with different const-character</td><td>Issaquah</td><td></td></tr>
<tr><td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2293">2293</a></td><td>Wrong facet used by num_put::do_put</td><td>Issaquah</td><td>Complete</td></tr>
<tr><td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2301">2301</a></td><td>Why is std::tie not constexpr?</td><td>Issaquah</td><td></td></tr>
<tr><td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2301">2301</a></td><td>Why is std::tie not constexpr?</td><td>Issaquah</td><td>Complete</td></tr>
<tr><td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2304">2304</a></td><td>Complexity of count in unordered associative containers</td><td>Issaquah</td><td>Complete</td></tr>
<tr><td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2306">2306</a></td><td>match_results::reference should be value_type&, not const value_type&</td><td>Issaquah</td><td></td></tr>
<tr><td><a href="http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-defects.html#2308">2308</a></td><td>Clarify container destructor requirements w.r.t. std::array</td><td>Issaquah</td><td>Complete</td></tr>