Standard library header <any>

This header is part of the general utility library.


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


specializes the std::swap algorithm
type-safe access to the contained object
(function template)


namespace std {
  // class bad_any_cast
  class bad_any_cast;
  // class any
  class any;
  // non-member functions
  void swap(any& x, any& y) noexcept;
  template <class T, class... Args>
  any make_any(Args&& ...args);
  template <class T, class U, class... Args>
  any make_any(initializer_list<U> il, Args&& ...args);
  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;

Class std::bad_any_cast

class bad_any_cast : public bad_cast {
  const char* what() const noexcept override;

Class std::any

class any {
  // construction and destruction
  constexpr any() noexcept;
  any(const any& other);
  any(any&& other) noexcept;
  template <class ValueType> any(ValueType&& value);
  template <class ValueType, class... Args>
  explicit any(in_place_type_t<ValueType>, Args&&...);
  template <class ValueType, class U, class... Args>
  explicit any(in_place_type_t<ValueType>, initializer_list<U>, Args&&...);
  // assignments
  any& operator=(const any& rhs);
  any& operator=(any&& rhs) noexcept;
  template <class ValueType> any& operator=(ValueType&& rhs);
  // modifiers
  template <class ValueType, class... Args>
  void emplace(Args&& ...);
  template <class ValueType, class U, class... Args>
  void emplace(initializer_list<U>, Args&&...);
  void reset() noexcept;
  void swap(any& rhs) noexcept;
  // observers
  bool has_value() const noexcept;
  const type_info& type() const noexcept;

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