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C++20 revised the definition of what it means to be an iterator. While all _Cpp17InputIterators_ satisfy `std::input_iterator`, the reverse isn't true. D100271 introduces a new test adaptor to accommodate this new definition (`cpp20_input_iterator`). In order to help readers immediately distinguish which input iterator adaptor is _Cpp17InputIterator_, the current `input_iterator` adaptor has been prefixed with `cpp17_`. Differential Revision: https://reviews.llvm.org/D101242
49 lines
1.5 KiB
C++
49 lines
1.5 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, class T>
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// requires HasEqualTo<Iter::value_type, T>
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// constexpr Iter::difference_type // constexpr after C++17
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// count(Iter first, Iter last, const T& value);
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#include <algorithm>
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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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#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(std::begin(ia), std::end(ia), 2) == 3)
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&& (std::count(std::begin(ib), std::end(ib), 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(cpp17_input_iterator<const int*>(ia),
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cpp17_input_iterator<const int*>(ia + sa), 2) == 3);
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assert(std::count(cpp17_input_iterator<const int*>(ia),
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cpp17_input_iterator<const int*>(ia + sa), 7) == 0);
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assert(std::count(cpp17_input_iterator<const int*>(ia),
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cpp17_input_iterator<const int*>(ia), 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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