Add tests for class template deduction on std::tuple.
llvm-svn: 304967
Cr-Mirrored-From: sso://chromium.googlesource.com/_direct/external/github.com/llvm/llvm-project
Cr-Mirrored-Commit: baaee2069003453affb97e55eb99199b3dee83d1
diff --git a/include/tuple b/include/tuple
index aa4713f..a52b934 100644
--- a/include/tuple
+++ b/include/tuple
@@ -929,6 +929,16 @@
void swap(tuple&) _NOEXCEPT {}
};
+#ifdef __cpp_deduction_guides
+// NOTE: These are not yet standardized, but are required to simulate the
+// implicit deduction guide that should be generated had libc++ declared the
+// tuple-like constructors "correctly"
+template <class _Alloc, class ..._Args>
+tuple(allocator_arg_t, const _Alloc&, tuple<_Args...> const&) -> tuple<_Args...>;
+template <class _Alloc, class ..._Args>
+tuple(allocator_arg_t, const _Alloc&, tuple<_Args...>&&) -> tuple<_Args...>;
+#endif
+
template <class ..._Tp>
inline _LIBCPP_INLINE_VISIBILITY
typename enable_if