simple_token.h

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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#ifndef BASE_SIMPLE_TOKEN_H_
#define BASE_SIMPLE_TOKEN_H_
 
#include <functional>
#include <optional>
#include <string>
 
namespace base {
 
// A simple string wrapping token.
class SimpleToken {
 public:
  // Create a random SimpleToken.
  static SimpleToken Create();
 
  // Creates an empty SimpleToken.
  // Assign to it with Create() before using it.
  SimpleToken() = default;
  ~SimpleToken() = default;
  // Creates an token that wrapps the input string.
  SimpleToken(const std::string& token);
 
  // Hex representation of the unguessable token.
  std::string ToString() const { return token_; }
 
  explicit constexpr operator bool() const { return !token_.empty(); }
 
  constexpr bool operator<(const SimpleToken& other) const {
    return token_.compare(other.token_) < 0;
  }
 
  constexpr bool operator==(const SimpleToken& other) const {
    return token_.compare(other.token_) == 0;
  }
 
  constexpr bool operator!=(const SimpleToken& other) const {
    return !(*this == other);
  }
 
 private:
  std::string token_;
};
 
std::ostream& operator<<(std::ostream& out, const SimpleToken& token);
 
std::optional<base::SimpleToken> ValueToSimpleToken(std::string str);
 
std::string SimpleTokenToValue(const SimpleToken& token);
 
size_t SimpleTokenHash(const SimpleToken& SimpleToken);
 
}  // namespace base
 
#endif  // BASE_SIMPLE_TOKEN_H_