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a281bdd51b
Incidentally, this removes some unqualified ADL calls to `begin` and `end`. Differential Revision: https://reviews.llvm.org/D119687
70 lines
2.0 KiB
C++
70 lines
2.0 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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// <valarray>
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// template<class T> class valarray;
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// template <class T> unspecified begin(valarray<T>& v);
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// template <class T> unspecified begin(const valarray<T>& v);
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// template <class T> unspecified end(valarray<T>& v);
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// template <class T> unspecified end(const valarray<T>& v);
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#include <valarray>
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#include <cassert>
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#include <iterator>
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#include <type_traits>
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#include "test_macros.h"
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int main(int, char**)
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{
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{
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int a[] = {1, 2, 3, 4, 5};
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std::valarray<int> v(a, 5);
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const std::valarray<int>& cv = v;
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using It = decltype(std::begin(v));
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using CIt = decltype(std::begin(cv));
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static_assert(std::is_base_of<std::random_access_iterator_tag, std::iterator_traits<It>::iterator_category>::value, "");
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static_assert(std::is_base_of<std::random_access_iterator_tag, std::iterator_traits<CIt>::iterator_category>::value, "");
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ASSERT_SAME_TYPE(decltype(*std::begin(v)), int&);
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ASSERT_SAME_TYPE(decltype(*std::begin(cv)), const int&);
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assert(&*std::begin(v) == &v[0]);
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assert(&*std::begin(cv) == &cv[0]);
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*std::begin(v) = 10;
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assert(v[0] == 10);
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ASSERT_SAME_TYPE(decltype(std::end(v)), It);
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ASSERT_SAME_TYPE(decltype(std::end(cv)), CIt);
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assert(&*std::prev(std::end(v)) == &v[4]);
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assert(&*std::prev(std::end(cv)) == &cv[4]);
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}
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#if TEST_STD_VER >= 11
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{
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int a[] = {1, 2, 3, 4, 5};
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std::valarray<int> v(a, 5);
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int sum = 0;
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for (int& i : v) {
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sum += i;
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}
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assert(sum == 15);
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}
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{
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int a[] = {1, 2, 3, 4, 5};
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const std::valarray<int> cv(a, 5);
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int sum = 0;
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for (const int& i : cv) {
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sum += i;
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}
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assert(sum == 15);
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}
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#endif
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return 0;
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}
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