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<ForwardIterator Iter, class T> 12 // requires OutputIterator<Iter, Iter::reference> 13 // && OutputIterator<Iter, const T&> 14 // && HasEqualTo<Iter::value_type, T> 15 // constexpr void // constexpr after C++17 16 // replace(Iter first, Iter last, const T& old_value, const T& new_value); 17 18 #include <algorithm> 19 #include <cassert> 20 21 #include "test_macros.h" 22 #include "test_iterators.h" 23 24 25 #if TEST_STD_VER > 17 26 TEST_CONSTEXPR bool test_constexpr() { 27 int ia[] = {0, 1, 2, 3, 4}; 28 const int expected[] = {0, 1, 5, 3, 4}; 29 30 std::replace(std::begin(ia), std::end(ia), 2, 5); 31 return std::equal(std::begin(ia), std::end(ia), std::begin(expected), std::end(expected)) 32 ; 33 } 34 #endif 35 36 template <class Iter> 37 void 38 test() 39 { 40 int ia[] = {0, 1, 2, 3, 4}; 41 const unsigned sa = sizeof(ia)/sizeof(ia[0]); 42 std::replace(Iter(ia), Iter(ia+sa), 2, 5); 43 assert(ia[0] == 0); 44 assert(ia[1] == 1); 45 assert(ia[2] == 5); 46 assert(ia[3] == 3); 47 assert(ia[4] == 4); 48 } 49 50 int main() 51 { 52 test<forward_iterator<int*> >(); 53 test<bidirectional_iterator<int*> >(); 54 test<random_access_iterator<int*> >(); 55 test<int*>(); 56 57 #if TEST_STD_VER > 17 58 static_assert(test_constexpr()); 59 #endif 60 } 61