generate.pass.cpp
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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<ForwardIterator Iter, Callable Generator>
// requires OutputIterator<Iter, Generator::result_type>
// && CopyConstructible<Generator>
// constexpr void // constexpr after c++17
// generate(Iter first, Iter last, Generator gen);
#include <algorithm>
#include <cassert>
#include "test_macros.h"
#include "test_iterators.h"
struct gen_test
{
TEST_CONSTEXPR int operator()() const {return 1;}
};
#if TEST_STD_VER > 17
TEST_CONSTEXPR bool test_constexpr() {
int ia[] = {0, 1, 2, 3, 4};
std::generate(std::begin(ia), std::end(ia), gen_test());
return std::all_of(std::begin(ia), std::end(ia), [](int x) { return x == 1; })
;
}
#endif
template <class Iter>
void
test()
{
const unsigned n = 4;
int ia[n] = {0};
std::generate(Iter(ia), Iter(ia+n), gen_test());
assert(ia[0] == 1);
assert(ia[1] == 1);
assert(ia[2] == 1);
assert(ia[3] == 1);
}
int main(int, char**)
{
test<forward_iterator<int*> >();
test<bidirectional_iterator<int*> >();
test<random_access_iterator<int*> >();
test<int*>();
#if TEST_STD_VER > 17
static_assert(test_constexpr());
#endif
return 0;
}