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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03
// <tuple>
// Test the diagnostics libc++ generates for invalid reference binding.
// Libc++ attempts to diagnose the following cases:
// * Constructing an lvalue reference from an rvalue.
// * Constructing an rvalue reference from an lvalue.
#include <tuple>
#include <string>
int main() {
std::allocator<void> alloc;
// expected-error@tuple:* 4 {{static_assert failed "Attempted to construct a reference element in a tuple with an rvalue"}}
// bind lvalue to rvalue
std::tuple<int const&> t(42); // expected-note {{requested here}}
std::tuple<int const&> t1(std::allocator_arg, alloc, 42); // expected-note {{requested here}}
// bind rvalue to constructed non-rvalue
std::tuple<std::string &&> t2("hello"); // expected-note {{requested here}}
std::tuple<std::string &&> t3(std::allocator_arg, alloc, "hello"); // expected-note {{requested here}}
// FIXME: The below warnings may get emitted as an error, a warning, or not emitted at all
// depending on the flags used to compile this test.
{
// expected-warning@tuple:* 0+ {{binding reference member '__value_' to a temporary value}}
// expected-error@tuple:* 0+ {{binding reference member '__value_' to a temporary value}}
}
}
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