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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.
//
//===----------------------------------------------------------------------===//
// <functional>
// reference_wrapper
// Test that reference wrapper meets the requirements of TriviallyCopyable,
// CopyConstructible and CopyAssignable.
#include <functional>
#include <type_traits>
#include <string>
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
class MoveOnly
{
MoveOnly(const MoveOnly&);
MoveOnly& operator=(const MoveOnly&);
int data_;
public:
MoveOnly(int data = 1) : data_(data) {}
MoveOnly(MoveOnly&& x)
: data_(x.data_) {x.data_ = 0;}
MoveOnly& operator=(MoveOnly&& x)
{data_ = x.data_; x.data_ = 0; return *this;}
int get() const {return data_;}
};
#endif
template <class T>
void test()
{
typedef std::reference_wrapper<T> Wrap;
static_assert(std::is_copy_constructible<Wrap>::value, "");
static_assert(std::is_copy_assignable<Wrap>::value, "");
// Extension up for standardization: See N4151.
static_assert(std::is_trivially_copyable<Wrap>::value, "");
}
int main()
{
test<int>();
test<double>();
test<std::string>();
#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
test<MoveOnly>();
#endif
}
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