You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
85 lines
2.8 KiB
C++
85 lines
2.8 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef TRANSPARENT_H
|
|
#define TRANSPARENT_H
|
|
|
|
#include "test_macros.h"
|
|
|
|
// testing transparent
|
|
#if TEST_STD_VER > 11
|
|
|
|
struct transparent_less
|
|
{
|
|
template <class T, class U>
|
|
constexpr auto operator()(T&& t, U&& u) const
|
|
noexcept(noexcept(std::forward<T>(t) < std::forward<U>(u)))
|
|
-> decltype (std::forward<T>(t) < std::forward<U>(u))
|
|
{ return std::forward<T>(t) < std::forward<U>(u); }
|
|
using is_transparent = void; // correct
|
|
};
|
|
|
|
struct transparent_less_not_referenceable
|
|
{
|
|
template <class T, class U>
|
|
constexpr auto operator()(T&& t, U&& u) const
|
|
noexcept(noexcept(std::forward<T>(t) < std::forward<U>(u)))
|
|
-> decltype (std::forward<T>(t) < std::forward<U>(u))
|
|
{ return std::forward<T>(t) < std::forward<U>(u); }
|
|
using is_transparent = void () const &; // it's a type; a weird one, but a type
|
|
};
|
|
|
|
struct transparent_less_no_type
|
|
{
|
|
template <class T, class U>
|
|
constexpr auto operator()(T&& t, U&& u) const
|
|
noexcept(noexcept(std::forward<T>(t) < std::forward<U>(u)))
|
|
-> decltype (std::forward<T>(t) < std::forward<U>(u))
|
|
{ return std::forward<T>(t) < std::forward<U>(u); }
|
|
private:
|
|
// using is_transparent = void; // error - should exist
|
|
};
|
|
|
|
struct transparent_less_private
|
|
{
|
|
template <class T, class U>
|
|
constexpr auto operator()(T&& t, U&& u) const
|
|
noexcept(noexcept(std::forward<T>(t) < std::forward<U>(u)))
|
|
-> decltype (std::forward<T>(t) < std::forward<U>(u))
|
|
{ return std::forward<T>(t) < std::forward<U>(u); }
|
|
private:
|
|
using is_transparent = void; // error - should be accessible
|
|
};
|
|
|
|
struct transparent_less_not_a_type
|
|
{
|
|
template <class T, class U>
|
|
constexpr auto operator()(T&& t, U&& u) const
|
|
noexcept(noexcept(std::forward<T>(t) < std::forward<U>(u)))
|
|
-> decltype (std::forward<T>(t) < std::forward<U>(u))
|
|
{ return std::forward<T>(t) < std::forward<U>(u); }
|
|
|
|
int is_transparent; // error - should be a type
|
|
};
|
|
|
|
struct C2Int { // comparable to int
|
|
C2Int() : i_(0) {}
|
|
C2Int(int i): i_(i) {}
|
|
int get () const { return i_; }
|
|
private:
|
|
int i_;
|
|
};
|
|
|
|
bool operator <(int rhs, const C2Int& lhs) { return rhs < lhs.get(); }
|
|
bool operator <(const C2Int& rhs, const C2Int& lhs) { return rhs.get() < lhs.get(); }
|
|
bool operator <(const C2Int& rhs, int lhs) { return rhs.get() < lhs; }
|
|
|
|
#endif
|
|
|
|
#endif // TRANSPARENT_H
|