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module/jni/libcxx/test/std/numerics/numarray/valarray.range/begin-end.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
+//
+//===----------------------------------------------------------------------===//
+
+// <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;
+}