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