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Experimental library header <experimental/any>

From cppreference.net
C++
Standard library headers
Experimental library headers
Execution P2300
<experimental/execution>
Filesystem TS
<experimental/filesystem>
Parallelism TS (v1, v2)
experimental/algorithm
experimental/execution_policy
experimental/exception_list
experimental/numeric
<experimental/simd>
experimental/task_block
Library Fundamentals TS (v1, v2, v3)
experimental/algorithm
<experimental/any>
experimental/array
experimental/chrono
experimental/deque
experimental/forward_list
<experimental/functional>
experimental/future
experimental/iterator
experimental/list
experimental/map
experimental/memory
<experimental/memory_resource>
experimental/numeric
<experimental/optional>
experimental/propagate_const
experimental/random
experimental/ratio
experimental/regex
experimental/scope
experimental/set
experimental/source_location
experimental/string
<experimental/string_view>
experimental/system_error
experimental/tuple
experimental/type_traits
experimental/unordered_map
experimental/unordered_set
experimental/utility
experimental/vector

Concurrency TS
experimental/atomic
experimental/barrier
experimental/future
experimental/latch
Ranges TS
Coroutines TS
experimental/coroutine
Networking TS
experimental/buffer
experimental/executor
experimental/internet
experimental/io_context
<experimental/net>
experimental/netfwd
experimental/socket
experimental/timer
Reflection TS
<experimental/reflect>

此头文件是 Library Fundamentals TS 的组成部分（ v1 ， v2 ）。

类

名称 描述
(library fundamentals TS)
由失败的 any_cast 抛出的异常。
(类)
(library fundamentals TS)
可容纳满足 ValueType 要求的任意类型实例的对象。
(类)

函数

交换两个 any 实例
(函数)
对所含对象进行类型安全访问
(函数模板)

概要 

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 构造/析构
    any() noexcept;
    any(const any& other);
    any(any&& x) noexcept;
    template <class ValueType>
        any(ValueType&& value);
    ~any();
    // 6.3.2, any 赋值操作
    any& operator=(const any& rhs);
    any& operator=(any&& rhs) noexcept;
    template <class ValueType>
      any& operator=(ValueType&& rhs);
    // 6.3.3, any 修改器
    void clear() noexcept;
    void swap(any& rhs) noexcept;
    // 6.3.4, any 观察器
    bool empty() const noexcept;
    const type_info& type() const noexcept;
  };
  // 6.4, 非成员函数
  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