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, Predicate<auto, Iter::value_type> Pred> 13 // requires CopyConstructible<Pred> 14 // Iter::difference_type 15 // count_if(Iter first, Iter last, Pred pred); 16 17 #include <algorithm> 18 #include <functional> 19 #include <cassert> 20 21 #include "test_iterators.h" 22 23 struct eq { 24 eq (int val) : v(val) {} 25 bool operator () (int v2) const { return v == v2; } 26 int v; 27 }; 28 29 30 int main() 31 { 32 int ia[] = {0, 1, 2, 2, 0, 1, 2, 3}; 33 const unsigned sa = sizeof(ia)/sizeof(ia[0]); 34 assert(std::count_if(input_iterator<const int*>(ia), 35 input_iterator<const int*>(ia + sa), 36 eq(2)) == 3); 37 assert(std::count_if(input_iterator<const int*>(ia), 38 input_iterator<const int*>(ia + sa), 39 eq(7)) == 0); 40 assert(std::count_if(input_iterator<const int*>(ia), 41 input_iterator<const int*>(ia), 42 eq(2)) == 0); 43 } 44