generate_n.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<class Iter, IntegralLike Size, Callable Generator>
// requires OutputIterator<Iter, Generator::result_type>
// && CopyConstructible<Generator>
// constexpr void // constexpr after c++17
// generate_n(Iter first, Size n, Generator gen);
#include "test_macros.h"
#ifdef TEST_COMPILER_C1XX
#pragma warning(disable: 4244) // conversion from 'const double' to 'int', possible loss of data
#endif
#include <algorithm>
#include <cassert>
#include "test_iterators.h"
#include "user_defined_integral.h"
struct gen_test
{
TEST_CONSTEXPR int operator()() const {return 2;}
};
#if TEST_STD_VER > 17
TEST_CONSTEXPR bool test_constexpr() {
const size_t N = 5;
int ib[] = {0, 0, 0, 0, 0, 0}; // one bigger than N
auto it = std::generate_n(std::begin(ib), N, gen_test());
return it == (std::begin(ib) + N)
&& std::all_of(std::begin(ib), it, [](int x) { return x == 2; })
&& *it == 0 // don't overwrite the last value in the output array
;
}
#endif
template <class Iter, class Size>
void
test2()
{
const unsigned n = 4;
int ia[n] = {0};
assert(std::generate_n(Iter(ia), Size(n), gen_test()) == Iter(ia+n));
assert(ia[0] == 2);
assert(ia[1] == 2);
assert(ia[2] == 2);
assert(ia[3] == 2);
}
template <class Iter>
void
test()
{
test2<Iter, int>();
test2<Iter, unsigned int>();
test2<Iter, long>();
test2<Iter, unsigned long>();
test2<Iter, UserDefinedIntegral<unsigned> >();
test2<Iter, float>();
test2<Iter, double>(); // this is PR#35498
test2<Iter, long double>();
}
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;
}