minmax_comp.pass.cpp (1773B)
1 //===----------------------------------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is dual licensed under the MIT and the University of Illinois Open 6 // Source Licenses. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 // <algorithm> 11 12 // template<class T, StrictWeakOrder<auto, T> Compare> 13 // requires !SameType<T, Compare> && CopyConstructible<Compare> 14 // pair<const T&, const T&> 15 // minmax(const T& a, const T& b, Compare comp); 16 17 #include <algorithm> 18 #include <functional> 19 #include <cassert> 20 21 #include "test_macros.h" 22 23 template <class T, class C> 24 void 25 test(const T& a, const T& b, C c, const T& x, const T& y) 26 { 27 std::pair<const T&, const T&> p = std::minmax(a, b, c); 28 assert(&p.first == &x); 29 assert(&p.second == &y); 30 } 31 32 33 int main() 34 { 35 { 36 int x = 0; 37 int y = 0; 38 test(x, y, std::greater<int>(), x, y); 39 test(y, x, std::greater<int>(), y, x); 40 } 41 { 42 int x = 0; 43 int y = 1; 44 test(x, y, std::greater<int>(), y, x); 45 test(y, x, std::greater<int>(), y, x); 46 } 47 { 48 int x = 1; 49 int y = 0; 50 test(x, y, std::greater<int>(), x, y); 51 test(y, x, std::greater<int>(), x, y); 52 } 53 #if TEST_STD_VER >= 14 54 { 55 // Note that you can't take a reference to a local var, since 56 // its address is not a compile-time constant. 57 constexpr static int x = 1; 58 constexpr static int y = 0; 59 constexpr auto p1 = std::minmax(x, y, std::greater<>()); 60 static_assert(p1.first == x, ""); 61 static_assert(p1.second == y, ""); 62 constexpr auto p2 = std::minmax(y, x, std::greater<>()); 63 static_assert(p2.first == x, ""); 64 static_assert(p2.second == y, ""); 65 } 66 #endif 67 }