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module/jni/libcxx/test/std/strings/string.view/string.view.deduct/range.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
+//
+//===----------------------------------------------------------------------===//
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+// UNSUPPORTED: libcpp-has-no-incomplete-ranges
+
+// <string_view>
+
+//  template<class Range>
+//    basic_string_view(Range&&) -> basic_string_view<ranges::range_value_t<Range>>; // C++23
+
+#include <string_view>
+#include <cassert>
+
+#include "make_string.h"
+#include "test_iterators.h"
+#include "test_macros.h"
+
+template<class CharT>
+void test() {
+  auto val = MAKE_STRING(CharT, "test");
+  auto sv = std::basic_string_view(val);
+  ASSERT_SAME_TYPE(decltype(sv), std::basic_string_view<CharT>);
+  assert(sv.size() == val.size());
+  assert(sv.data() == val.data());
+}
+
+void test() {
+  test<char>();
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+  test<wchar_t>();
+#endif
+  test<char8_t>();
+  test<char16_t>();
+  test<char32_t>();
+  test<char>();
+
+  struct Widget {
+    const char16_t *data_ = u"foo";
+    contiguous_iterator<const char16_t*> begin() const { return contiguous_iterator<const char16_t*>(data_); }
+    contiguous_iterator<const char16_t*> end() const { return contiguous_iterator<const char16_t*>(data_ + 3); }
+  };
+  std::basic_string_view bsv = Widget();
+  ASSERT_SAME_TYPE(decltype(bsv), std::basic_string_view<char16_t>);
+}
+
+int main(int, char**) {
+  test();
+
+  return 0;
+}
+