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Re-implement LWG 2770 - Fix tuple_size with structured bindings.

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This patch implements the correct PR for LWG 2770. It also makes the primary
tuple_size template incomplete again which fixes part of llvm.org/PR31513.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@290846 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Fiselier
2017-01-02 23:54:13 +00:00
parent b45121da64
commit 408438494b
5 changed files with 34 additions and 29 deletions
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include/tuple
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@@ -84,7 +84,7 @@ template <class T, class Tuple>
constexpr T make_from_tuple(Tuple&& t); // C++17
// 20.4.1.4, tuple helper classes:
template <class T> class tuple_size;
template <class T> class tuple_size; // undefined
template <class... T> class tuple_size<tuple<T...>>;
template <class T>
constexpr size_t tuple_size_v = tuple_size<T>::value; // C++17