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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_STRINGS_STRING_VIEW_UTIL_H_
#define BASE_STRINGS_STRING_VIEW_UTIL_H_
#include <string_view>
#include "base/compiler_specific.h"
#include "base/containers/span.h"
namespace base {
// Helper function for creating a std::string_view from a string literal that
// preserves internal NUL characters.
template <class CharT, size_t N>
std::basic_string_view<CharT> MakeStringViewWithNulChars(
const CharT (&lit LIFETIME_BOUND)[N])
ENABLE_IF_ATTR(lit[N - 1u] == CharT{0},
"requires string literal as input") {
return std::basic_string_view<CharT>(lit, N - 1u);
}
// Converts a span over byte-like elements to `std::string_view`.
//
// std:: has no direct equivalent for this; however, it eases span adoption in
// Chromium, which uses `string`s and `string_view`s in many cases that
// rightfully should be containers of `uint8_t`.
//
// TODO(C++23): Replace with direct use of the `std::string_view` range
// constructor.
constexpr auto as_string_view(span<const char> s) {
return std::string_view(s.begin(), s.end());
}
constexpr auto as_string_view(span<const unsigned char> s) {
return as_string_view(as_chars(s));
}
constexpr auto as_string_view(span<const char16_t> s) {
return std::u16string_view(s.begin(), s.end());
}
constexpr auto as_string_view(span<const wchar_t> s) {
return std::wstring_view(s.begin(), s.end());
}
} // namespace base
#endif // BASE_STRINGS_STRING_VIEW_UTIL_H_
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