libcxx/test/std/containers/sequences/array/compare.verify.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 // <array>
  10
  11 // template <class T, size_t N>
  12 //   bool operator==(const array<T,N>& x, const array<T,N>& y);    // constexpr in C++20
  13 // template <class T, size_t N>
  14 //   bool operator!=(const array<T,N>& x, const array<T,N>& y);    // removed in C++20
  15 // template <class T, size_t N>
  16 //   bool operator<(const array<T,N>& x, const array<T,N>& y);     // removed in C++20
  17 // template <class T, size_t N>
  18 //   bool operator>(const array<T,N>& x, const array<T,N>& y);     // removed in C++20
  19 // template <class T, size_t N>
  20 //   bool operator<=(const array<T,N>& x, const array<T,N>& y);    // removed in C++20
  21 // template <class T, size_t N>
  22 //   bool operator>=(const array<T,N>& x, const array<T,N>& y);    // removed in C++20
  23
  24 #include <array>
  25
  26 #include "test_macros.h"
  27
  28 template <int>
  29 struct NoCompare {};
  30
  31 int main(int, char**) {
  32   {
  33     typedef NoCompare<0> T;
  34     typedef std::array<T, 3> C;
  35     C c1 = {{}};
  36     // expected-error@*:* 2 {{invalid operands to binary expression}}
  37     TEST_IGNORE_NODISCARD(c1 == c1);
  38     TEST_IGNORE_NODISCARD(c1 < c1);
  39   }
  40   {
  41     typedef NoCompare<1> T;
  42     typedef std::array<T, 3> C;
  43     C c1 = {{}};
  44     // expected-error@*:* 2 {{invalid operands to binary expression}}
  45     TEST_IGNORE_NODISCARD(c1 != c1);
  46     TEST_IGNORE_NODISCARD(c1 > c1);
  47   }
  48   {
  49     typedef NoCompare<2> T;
  50     typedef std::array<T, 0> C;
  51     C c1 = {{}};
  52     // expected-error@*:* 2 {{invalid operands to binary expression}}
  53     TEST_IGNORE_NODISCARD(c1 == c1);
  54     TEST_IGNORE_NODISCARD(c1 < c1);
  55   }
  56
  57   return 0;
  58 }