Standard library header <typeinfo>

 

C++

Language

Headers

Freestanding and hosted implementations

Named requirements

Language support library

Concepts library (C++20)

Diagnostics library

Utilities library

Strings library

Containers library

Algorithms library

Iterators library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Filesystem library (C++17)

Technical Specifications

 

Standard Library header files

Language Support
<cstddef> <limits> <climits> <contract>	<cfloat> <cstdint> <new> <version>	<typeinfo> <exception> <initializer_list>	<csignal> <csetjmp> <cstdarg>
Concepts
<concepts>
Diagnostics
<stdexcept>	<cassert>	<cerrno>	<system_error>
General utilities
<utility> <memory> <memory_resource> <scoped_allocator>     <compare>	<bitset> <tuple> <optional> <any> <variant>	<type_traits> <ratio> <chrono> <typeindex> <functional>	<ctime> <cstdlib>
Strings
<string> <string_view>	<cctype> <cwctype>	<cwchar> <cuchar>	<cstring> <charconv>
Localization
<locale>	<codecvt>	<clocale>
Containers
<span> <array> <vector>	<deque> <forward_list> <list>	<map> <set> <queue>	<unordered_map> <unordered_set> <stack>
Iterators
<iterator>
Algorithms
<algorithm>	<execution>
Numerics
<complex> <random>	<valarray> <numeric>	<cfenv> <cmath>	<bit>
Input/Output
<iosfwd> <ios> <iomanip> <streambuf>	<istream> <ostream> <iostream>	<sstream> <fstream> <syncstream>	<cstdio> <cinttypes> <strstream>
Regular expressions
<regex>
Filesystem support
<filesystem>
Thread support
<thread> <atomic>	<mutex> <shared_mutex>	<condition_variable> <future>
C compatibility
<ciso646> <cstdalign>	<cstdbool> <ccomplex>	<ctgmath>

 

This header is part of the type support library.

Classes

type_info	contains some type's information, generated by the implementation. This is the class returned by the typeid operator. (class)
bad_typeid	exception that is thrown if an argument in a typeid expression is null (class)
bad_cast	exception that is thrown by an invalid dynamic_cast expression, i.e. a cast of reference type fails (class)

Synopsis

namespace std {
  class type_info;
  class bad_cast;
  class bad_typeid;
}

Class std::type_info

class type_info {
public:
  virtual ~type_info();
  bool operator==(const type_info& rhs) const noexcept;
  bool operator!=(const type_info& rhs) const noexcept;
  bool before(const type_info& rhs) const noexcept;
  size_t hash_code() const noexcept;
  const char* name() const noexcept;
  type_info(const type_info& rhs) = delete; // cannot be copied
  type_info& operator=(const type_info& rhs) = delete; // cannot be copied
};

Class std::bad_cast

class bad_cast : public exception {
public:
  bad_cast() noexcept;
  bad_cast(const bad_cast&) noexcept;
  bad_cast& operator=(const bad_cast&) noexcept;
  const char* what() const noexcept override;
};

Class std::bad_typeid

class bad_typeid : public exception {
public:
  bad_typeid() noexcept;
  bad_typeid(const bad_typeid&) noexcept;
  bad_typeid& operator=(const bad_typeid&) noexcept;
  const char* what() const noexcept override;
};