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59 lines
1.8 KiB
C++
59 lines
1.8 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// <algorithm>
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// template<InputIterator Iter, Predicate<auto, Iter::value_type> Pred>
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// requires CopyConstructible<Pred>
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// constexpr Iter::difference_type // constexpr after C++17
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// count_if(Iter first, Iter last, Pred pred);
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#include <algorithm>
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#include <functional>
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#include <cassert>
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#include "test_macros.h"
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#include "test_iterators.h"
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struct eq {
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TEST_CONSTEXPR eq (int val) : v(val) {}
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TEST_CONSTEXPR bool operator () (int v2) const { return v == v2; }
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int v;
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};
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#if TEST_STD_VER > 17
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TEST_CONSTEXPR bool test_constexpr() {
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int ia[] = {0, 1, 2, 2, 0, 1, 2, 3};
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int ib[] = {1, 2, 3, 4, 5, 6};
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return (std::count_if(std::begin(ia), std::end(ia), eq(2)) == 3)
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&& (std::count_if(std::begin(ib), std::end(ib), eq(9)) == 0)
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;
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}
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#endif
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int main(int, char**)
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{
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int ia[] = {0, 1, 2, 2, 0, 1, 2, 3};
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const unsigned sa = sizeof(ia)/sizeof(ia[0]);
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assert(std::count_if(input_iterator<const int*>(ia),
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input_iterator<const int*>(ia + sa),
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eq(2)) == 3);
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assert(std::count_if(input_iterator<const int*>(ia),
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input_iterator<const int*>(ia + sa),
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eq(7)) == 0);
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assert(std::count_if(input_iterator<const int*>(ia),
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input_iterator<const int*>(ia),
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eq(2)) == 0);
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#if TEST_STD_VER > 17
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static_assert(test_constexpr());
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#endif
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return 0;
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}
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