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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// <algorithm>
// template<InputIterator InIter, OutputIterator<auto, InIter::reference> OutIter,
// Predicate<auto, InIter::value_type> Pred>
// requires CopyConstructible<Pred>
// constexpr OutIter // constexpr after C++17
// copy_if(InIter first, InIter last, OutIter result, Pred pred);
#include <algorithm>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
#include "type_algorithms.h"
struct Pred {
TEST_CONSTEXPR_CXX14 bool operator()(int i) { return i % 3 == 0; }
};
template <class InIter>
struct TestOutIters {
template <class OutIter>
TEST_CONSTEXPR_CXX20 void operator()() {
const unsigned N = 1000;
int ia[N] = {};
for (unsigned i = 0; i < N; ++i)
ia[i] = i;
int ib[N] = {0};
OutIter r = std::copy_if(InIter(ia), InIter(ia + N), OutIter(ib), Pred());
assert(base(r) == ib + N / 3 + 1);
for (unsigned i = 0; i < N / 3 + 1; ++i)
assert(ib[i] % 3 == 0);
}
};
struct TestInIters {
template <class InIter>
TEST_CONSTEXPR_CXX20 void operator()() {
types::for_each(
types::concatenate_t<types::cpp17_input_iterator_list<int*>, types::type_list<cpp17_output_iterator<int*> > >(),
TestOutIters<InIter>());
}
};
TEST_CONSTEXPR_CXX20 bool test() {
types::for_each(types::cpp17_input_iterator_list<const int*>(), TestInIters());
return true;
}
int main(int, char**) {
test();
#if TEST_STD_VER > 17
static_assert(test());
#endif
return 0;
}
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