llvm/libcxx/test/std/utilities/meta/meta.rel/is_nothrow_convertible.pass.cpp

//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//

// <type_traits>
// UNSUPPORTED: c++03, c++11, c++14, c++17

#include <type_traits>

#include "test_macros.h"

struct A {};
struct B {
public:
    operator A() { return a; } A a;
};

class C { };
class D {
public:
    operator C() noexcept { return c; } C c;
};

int main(int, char**) {
    static_assert((std::is_nothrow_convertible<int, double>::value), "");
    static_assert(!(std::is_nothrow_convertible<int, char*>::value), "");

    static_assert(!(std::is_nothrow_convertible<A, B>::value), "");
    static_assert((std::is_nothrow_convertible<D, C>::value), "");

    static_assert((std::is_nothrow_convertible_v<int, double>), "");
    static_assert(!(std::is_nothrow_convertible_v<int, char*>), "");

    static_assert(!(std::is_nothrow_convertible_v<A, B>), "");
    static_assert((std::is_nothrow_convertible_v<D, C>), "");

    static_assert((std::is_nothrow_convertible_v<const void, void>), "");
    static_assert((std::is_nothrow_convertible_v<volatile void, void>), "");
    static_assert((std::is_nothrow_convertible_v<void, const void>), "");
    static_assert((std::is_nothrow_convertible_v<void, volatile void>), "");

    static_assert(!(std::is_nothrow_convertible_v<int[], double[]>), "");
    static_assert(!(std::is_nothrow_convertible_v<int[], int[]>), "");
    static_assert(!(std::is_nothrow_convertible_v<int[10], int[10]>), "");
    static_assert(!(std::is_nothrow_convertible_v<int[10], double[10]>), "");
    static_assert(!(std::is_nothrow_convertible_v<int[5], double[10]>), "");
    static_assert(!(std::is_nothrow_convertible_v<int[10], A[10]>), "");

    typedef void V();
    typedef int I();
    static_assert(!(std::is_nothrow_convertible_v<V, V>), "");
    static_assert(!(std::is_nothrow_convertible_v<V, I>), "");

    return 0;
}