libcxx/test/std/algorithms/alg.sorting/alg.min.max/max.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 // <algorithm>
  10
  11 // template<LessThanComparable T>
  12 //   const T&
  13 //   max(const T& a, const T& b);
  14
  15 #include <algorithm>
  16 #include <cassert>
  17
  18 #include "test_macros.h"
  19
  20 template <class T>
  21 void
  22 test(const T& a, const T& b, const T& x)
  23 {
  24     assert(&std::max(a, b) == &x);
  25 }
  26
  27 int main(int, char**)
  28 {
  29     {
  30     int x = 0;
  31     int y = 0;
  32     test(x, y, x);
  33     test(y, x, y);
  34     }
  35     {
  36     int x = 0;
  37     int y = 1;
  38     test(x, y, y);
  39     test(y, x, y);
  40     }
  41     {
  42     int x = 1;
  43     int y = 0;
  44     test(x, y, x);
  45     test(y, x, x);
  46     }
  47 #if TEST_STD_VER >= 14
  48     {
  49     constexpr int x = 1;
  50     constexpr int y = 0;
  51     static_assert(std::max(x, y) == x, "" );
  52     static_assert(std::max(y, x) == x, "" );
  53     }
  54 #endif
  55
  56   return 0;
  57 }