Standard library header <experimental/any>

 

C++

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Concepts

Utilities library

Strings library

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Numerics library

Input/output library

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

 

This header is part of the experimental library.

Classes

Name	Description
bad_any_cast (library fundamentals TS)	exception that is thrown by a failed any_cast. (class)
any (library fundamentals TS)	Objects that hold instances of any type that satisfies the ValueType requirements. (class)

Functions

swap	swaps two any instances (function)
any_cast	type-safe access to the contained object (function template)

Synopsis

namespace std {
namespace experimental {
inline namespace fundamentals_v1 {
 
  class bad_any_cast : public bad_cast
  {
  public:
    virtual const char* what() const noexcept;
  };
 
  class any
  {
  public:
    // 6.3.1, any construct/destruct
    any() noexcept;
 
    any(const any& other);
    any(any&& x) noexcept;
 
    template <class ValueType>
        any(ValueType&& value);
 
    ~any();
 
    // 6.3.2, any assignments
    any& operator=(const any& rhs);
    any& operator=(any&& rhs) noexcept;
 
    template <class ValueType>
      any& operator=(ValueType&& rhs);
 
    // 6.3.3, any modifiers
    void clear() noexcept;
    void swap(any& rhs) noexcept;
 
    // 6.3.4, any observers
    bool empty() const noexcept;
    const type_info& type() const noexcept;
  };
 
  // 6.4, 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 fundamentals_v1
} // namespace experimental
} // namespace std