any
此标头是一般效用图书馆。
班
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) |
功能
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) |
简介
二次
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;
}二次
类std::bad_any_cast
二次
class bad_any_cast : public bad_cast {
public:
const char* what() const noexcept override;
};二次
类std::any
二次
class any {
public:
// 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&&...);
~any();
// 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;
};二次
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