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

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9
  10 // <type_traits>
  11 // UNSUPPORTED: c++03, c++11, c++14, c++17
  12
  13 #include <type_traits>
  14
  15 #include "test_macros.h"
  16
  17 struct A {};
  18 struct B {
  19 public:
  20     operator A() { return a; } A a;
  21 };
  22
  23 class C { };
  24 class D {
  25 public:
  26     operator C() noexcept { return c; } C c;
  27 };
  28
  29 int main(int, char**) {
  30     static_assert((std::is_nothrow_convertible<int, double>::value), "");
  31     static_assert(!(std::is_nothrow_convertible<int, char*>::value), "");
  32
  33     static_assert(!(std::is_nothrow_convertible<A, B>::value), "");
  34     static_assert((std::is_nothrow_convertible<D, C>::value), "");
  35
  36     static_assert((std::is_nothrow_convertible_v<int, double>), "");
  37     static_assert(!(std::is_nothrow_convertible_v<int, char*>), "");
  38
  39     static_assert(!(std::is_nothrow_convertible_v<A, B>), "");
  40     static_assert((std::is_nothrow_convertible_v<D, C>), "");
  41
  42     static_assert((std::is_nothrow_convertible_v<const void, void>), "");
  43     static_assert((std::is_nothrow_convertible_v<volatile void, void>), "");
  44     static_assert((std::is_nothrow_convertible_v<void, const void>), "");
  45     static_assert((std::is_nothrow_convertible_v<void, volatile void>), "");
  46
  47     static_assert(!(std::is_nothrow_convertible_v<int[], double[]>), "");
  48     static_assert(!(std::is_nothrow_convertible_v<int[], int[]>), "");
  49     static_assert(!(std::is_nothrow_convertible_v<int[10], int[10]>), "");
  50     static_assert(!(std::is_nothrow_convertible_v<int[10], double[10]>), "");
  51     static_assert(!(std::is_nothrow_convertible_v<int[5], double[10]>), "");
  52     static_assert(!(std::is_nothrow_convertible_v<int[10], A[10]>), "");
  53
  54     typedef void V();
  55     typedef int I();
  56     static_assert(!(std::is_nothrow_convertible_v<V, V>), "");
  57     static_assert(!(std::is_nothrow_convertible_v<V, I>), "");
  58
  59     return 0;
  60 }