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Showing content from https://en.cppreference.com/w/cpp/algorithm/../preprocessor/../header/experimental/any.html below:

Experimental library header <experimental/any> - cppreference.com

This header is part of the Library Fundamentals TS (v1, v2).

[edit] Classes Name Description

(library fundamentals TS)

exception that is thrown by a failed any_cast.
(class)

(library fundamentals TS)

Objects that hold instances of any type that satisfies the ValueType requirements.
(class) [edit] Functions swaps two any instances
(function) [edit] type-safe access to the contained object
(function template) [edit] [edit] 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

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