//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// <valarray>
// template<class T> class valarray;
// template <class T> unspecified begin(valarray<T>& v);
// template <class T> unspecified begin(const valarray<T>& v);
// template <class T> unspecified end(valarray<T>& v);
// template <class T> unspecified end(const valarray<T>& v);
#include <valarray>
#include <cassert>
#include <iterator>
#include <type_traits>
#include "test_macros.h"
int main(int, char**)
{
{
int a[] = {1, 2, 3, 4, 5};
std::valarray<int> v(a, 5);
const std::valarray<int>& cv = v;
using It = decltype(std::begin(v));
using CIt = decltype(std::begin(cv));
static_assert(std::is_base_of<std::random_access_iterator_tag, std::iterator_traits<It>::iterator_category>::value, "");
static_assert(std::is_base_of<std::random_access_iterator_tag, std::iterator_traits<CIt>::iterator_category>::value, "");
ASSERT_SAME_TYPE(decltype(*std::begin(v)), int&);
ASSERT_SAME_TYPE(decltype(*std::begin(cv)), const int&);
assert(&*std::begin(v) == &v[0]);
assert(&*std::begin(cv) == &cv[0]);
*std::begin(v) = 10;
assert(v[0] == 10);
ASSERT_SAME_TYPE(decltype(std::end(v)), It);
ASSERT_SAME_TYPE(decltype(std::end(cv)), CIt);
assert(&*std::prev(std::end(v)) == &v[4]);
assert(&*std::prev(std::end(cv)) == &cv[4]);
}
#if TEST_STD_VER >= 11
{
int a[] = {1, 2, 3, 4, 5};
std::valarray<int> v(a, 5);
int sum = 0;
for (int& i : v) {
sum += i;
}
assert(sum == 15);
}
{
int a[] = {1, 2, 3, 4, 5};
const std::valarray<int> cv(a, 5);
int sum = 0;
for (const int& i : cv) {
sum += i;
}
assert(sum == 15);
}
#endif
return 0;
}