typeindex
标准库标头<typeindex>
此标头是类型支持图书馆。
班
| type_index (C++11) | wrapper around a type_info object, that can be used as index in associative and unordered associative containers (class) |
|---|---|
| std::hash<std::type_index> (C++11) | hash support for std::type_index (class template specialization) |
前向声明
在标头中定义<functional>
散列%28C++11%29散列函数对象%28类模板%29
简介
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namespace std {
class type_index;
template <class T> struct hash;
template<> struct hash<type_index>;
}
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类std::type_index
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class type_index {
public:
type_index(const type_info& rhs) noexcept;
bool operator==(const type_index& rhs) const noexcept;
bool operator!=(const type_index& rhs) const noexcept;
bool operator< (const type_index& rhs) const noexcept;
bool operator<= (const type_index& rhs) const noexcept;
bool operator> (const type_index& rhs) const noexcept;
bool operator>= (const type_index& rhs) const noexcept;
size_t hash_code() const;
const char* name() const;
private:
const type_info* target; // exposition only
// Note that the use of a pointer here, rather than a reference,
// means that the default copy/move constructor and assignment
// operators will be provided and work as expected.
};
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