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<InputIterator Iter, class T> 12 // requires HasEqualTo<Iter::value_type, T> 13 // constexpr Iter::difference_type // constexpr after C++17 14 // count(Iter first, Iter last, const T& value); 15 16 #include <algorithm> 17 #include <cassert> 18 19 #include "test_macros.h" 20 #include "test_iterators.h" 21 22 #if TEST_STD_VER > 17 23 TEST_CONSTEXPR bool test_constexpr() { 24 int ia[] = {0, 1, 2, 2, 0, 1, 2, 3}; 25 int ib[] = {1, 2, 3, 4, 5, 6}; 26 return (std::count(std::begin(ia), std::end(ia), 2) == 3) 27 && (std::count(std::begin(ib), std::end(ib), 9) == 0) 28 ; 29 } 30 #endif 31 32 int main(int, char**) 33 { 34 int ia[] = {0, 1, 2, 2, 0, 1, 2, 3}; 35 const unsigned sa = sizeof(ia)/sizeof(ia[0]); 36 assert(std::count(cpp17_input_iterator<const int*>(ia), 37 cpp17_input_iterator<const int*>(ia + sa), 2) == 3); 38 assert(std::count(cpp17_input_iterator<const int*>(ia), 39 cpp17_input_iterator<const int*>(ia + sa), 7) == 0); 40 assert(std::count(cpp17_input_iterator<const int*>(ia), 41 cpp17_input_iterator<const int*>(ia), 2) == 0); 42 43 #if TEST_STD_VER > 17 44 static_assert(test_constexpr()); 45 #endif 46 47 return 0; 48 } 49