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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>
#include <functional>
#include <cassert>
static_assert(std::is_constructible<int&, std::reference_wrapper<int>>::value, "");
static_assert(std::is_constructible<int const&, std::reference_wrapper<int>>::value, "");
int main() {
std::allocator<void> alloc;
int x = 42;
{
std::tuple<int&> t(std::ref(x));
assert(&std::get<0>(t) == &x);
std::tuple<int&> t1(std::allocator_arg, alloc, std::ref(x));
assert(&std::get<0>(t1) == &x);
}
{
auto r = std::ref(x);
auto const& cr = r;
std::tuple<int&> t(r);
assert(&std::get<0>(t) == &x);
std::tuple<int&> t1(cr);
assert(&std::get<0>(t1) == &x);
std::tuple<int&> t2(std::allocator_arg, alloc, r);
assert(&std::get<0>(t2) == &x);
std::tuple<int&> t3(std::allocator_arg, alloc, cr);
assert(&std::get<0>(t3) == &x);
}
{
std::tuple<int const&> t(std::ref(x));
assert(&std::get<0>(t) == &x);
std::tuple<int const&> t2(std::cref(x));
assert(&std::get<0>(t2) == &x);
std::tuple<int const&> t3(std::allocator_arg, alloc, std::ref(x));
assert(&std::get<0>(t3) == &x);
std::tuple<int const&> t4(std::allocator_arg, alloc, std::cref(x));
assert(&std::get<0>(t4) == &x);
}
{
auto r = std::ref(x);
auto cr = std::cref(x);
std::tuple<int const&> t(r);
assert(&std::get<0>(t) == &x);
std::tuple<int const&> t2(cr);
assert(&std::get<0>(t2) == &x);
std::tuple<int const&> t3(std::allocator_arg, alloc, r);
assert(&std::get<0>(t3) == &x);
std::tuple<int const&> t4(std::allocator_arg, alloc, cr);
assert(&std::get<0>(t4) == &x);
}
}
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