Standard library header <any>

 

C++

Language

Standard library headers

Concepts

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> <cfloat> <cstdint> <new> <typeinfo> <exception> <ciso646>	<exception_list> <initializer_list> <csignal> <csetjmp> <cstdalign> <cstdarg> <cstdbool> <ctime>
Diagnostics
<stdexcept> <cassert>	<cerrno> <system_error>
General utilities
<utility> <tuple> <optional> <any> <memory> <memory_resource> <scoped_allocator> <cstdlib>	<bitset> <functional> <type_traits> <ratio> <chrono> <ctime> <typeindex>
Strings
<string> <cctype> <cwctype> <cstring>	<string_view> <cwchar> <cuchar>
Localization
<locale> <codecvt> <clocale>

Containers
<array> <deque> <forward_list> <list> <vector>	<map> <set> <unordered_map> <unordered_set> <queue> <stack>
Iterators
<iterator>
Algorithms
<algorithm>	<execution_policy>
Numerics
<cfenv> <complex> <random> <valarray>	<numeric> <cmath> <ctgmath>
Input/Output
<iosfwd> <iostream> <ios> <streambuf> <istream> <ostream>	<iomanip> <sstream> <fstream> <filesystem> <cstdio> <cinttypes>
Regular expressions
<regex>
Thread support
<thread> <mutex> <atomic>	<shared_mutex> <condition_variable> <future>

 

This header is part of the general utility library.

Classes

Name	Description
any (since C++17)	Objects that hold instances of any CopyConstructible type. (class)
bad_any_cast (C++17)	exception thrown by the value-returning forms of any_cast on a type mismatch (class)

Functions

std::swap(std::any) (C++17)	specializes the std::swap algorithm (function)
any_cast (C++17)	type-safe access to the contained object (function template)

Synopsis

namespace std {
 
  class bad_any_cast : public bad_cast
  {
  public:
    virtual const char* what() const noexcept;
  };
 
  class any
  {
  public:
    // any construct/destruct
    any() noexcept;
 
    any(const any& other);
    any(any&& x) noexcept;
 
    template <class ValueType>
        any(ValueType&& value);
 
    ~any();
 
    // any assignments
    any& operator=(const any& rhs);
    any& operator=(any&& rhs) noexcept;
 
    template <class ValueType>
      any& operator=(ValueType&& rhs);
 
    // any modifiers
    void clear() noexcept;
    void swap(any& rhs) noexcept;
 
    // any observers
    bool empty() const noexcept;
    const type_info& type() const noexcept;
  };
 
  // Non-member functions
  void swap(any& x, any& y) noexcept;
 
  template<class ValueType>
    ValueType any_cast(const any& operand);
  template<class ValueType>
    ValueType any_cast(any& operand);
  template<class ValueType>
    ValueType any_cast(any&& operand);
 
  template<class ValueType>
    const ValueType* any_cast(const any* operand) noexcept;
  template<class ValueType>
    ValueType* any_cast(any* operand) noexcept;
 
} // namespace std