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// Copyright 2018 The Chromium 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_TYPE_ID_H_
#define BASE_TYPE_ID_H_
#include <stdint.h>
#include <string>
#include "base/base_export.h"
#include "base/compiler_specific.h"
#include "base/logging.h"
#include "base/strings/string_piece.h"
#include "build/build_config.h"
namespace base {
// Not ready for public consumption yet.
namespace experimental {
// A substitute for RTTI that uses the linker to uniquely reserve an address in
// the binary for each type.
class TypeId {
bool constexpr operator==(const TypeId& other) const {
return type_id_ == other.type_id_;
bool constexpr operator!=(const TypeId& other) const {
return !(*this == other);
template <typename Type>
static constexpr TypeId Create() {
return TypeId(&TypeTag<Type>::dummy_var, PRETTY_FUNCTION);
std::string ToString() const;
template <typename Type>
struct TypeTag {
constexpr static char dummy_var = 0;
constexpr TypeId(const void* type_id, const char* function_name)
type_id_(type_id) {
const char* const function_name_;
const void* const type_id_;
template <typename Type>
constexpr char TypeId::TypeTag<Type>::dummy_var;
BASE_EXPORT std::ostream& operator<<(std::ostream& out, const TypeId& type_id);
} // namespace experimental
} // namespace base
#endif // BASE_TYPE_ID_H_