chromium/third_party/abseil-cpp/absl/strings/charset.h

// Copyright 2022 The Abseil Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// -----------------------------------------------------------------------------
// File: charset.h
// -----------------------------------------------------------------------------
//
// This file contains absl::CharSet, a fast, bit-vector set of 8-bit unsigned
// characters.
//
// Instances can be initialized as constexpr constants. For example:
//
//   constexpr absl::CharSet kJustX = absl::CharSet::Char('x');
//   constexpr absl::CharSet kMySymbols = absl::CharSet("$@!");
//   constexpr absl::CharSet kLetters = absl::CharSet::Range('a', 'z');
//
// Multiple instances can be combined that still forms a constexpr expression.
// For example:
//
//   constexpr absl::CharSet kLettersAndNumbers =
//       absl::CharSet::Range('a', 'z') | absl::CharSet::Range('0', '9');
//
// Several pre-defined character classes are available that mirror the methods
// from <cctype>. For example:
//
//   constexpr absl::CharSet kLettersAndWhitespace =
//       absl::CharSet::AsciiAlphabet() | absl::CharSet::AsciiWhitespace();
//
// To check membership, use the .contains method, e.g.
//
//   absl::CharSet hex_letters("abcdef");
//   hex_letters.contains('a');  // true
//   hex_letters.contains('g');  // false

#ifndef ABSL_STRINGS_CHARSET_H_
#define ABSL_STRINGS_CHARSET_H_

#include <cstddef>
#include <cstdint>
#include <cstring>

#include "absl/base/macros.h"
#include "absl/base/port.h"
#include "absl/strings/string_view.h"

namespace absl {

class CharSet { … };

}  // namespace absl

#endif  // ABSL_STRINGS_CHARSET_H_