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标准库头文件 <typeindex> (C++11)

来自 cppreference.com
< cpp‎ | header
 
 
标准库头文件
语言支持
概念
<concepts> (C++20)
诊断
<system_error> (C++11)

内存管理
<memory_resource> (C++17)  
元编程
<type_traits> (C++11)
<ratio> (C++11)
通用实用程序
<utility>
<tuple> (C++11)
<optional> (C++17)
<variant> (C++17)
<any> (C++17)
<debugging> (C++26)
<expected> (C++23)
<bitset>
<functional>
<typeindex> (C++11)
<execution> (C++17)

<charconv> (C++17)
<format> (C++20)
<bit> (C++20)

字符串
<cuchar> (C++11)

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<flat_set> (C++23)
<span> (C++20)
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<cfenv> (C++11)
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<cstdio>
<cinttypes> (C++11)
<strstream> (C++98/26*)
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<stop_token> (C++20)
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<condition_variable> (C++11)  
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<barrier> (C++20)
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C 兼容性
<cstdbool> (C++11/17/20*)  
<ccomplex> (C++11/17/20*)
<ctgmath> (C++11/17/20*)

<cstdalign> (C++11/17/20*)

<ciso646> (直到 C++20)

 

此头文件是 类型支持 库的一部分。

内容

包含

(C++20)
三元比较运算符 支持[编辑]

围绕 type_info 对象的包装器,可作为关联容器和无序关联容器的索引使用
(类) [编辑]
std::type_index 的哈希支持
(类模板特化) [编辑]
前向声明
在头文件 <functional> 中定义
(C++11)
哈希函数对象
(类模板) [编辑]

[编辑] 概述

#include <compare>
 
namespace std {
  class type_index;
  template<class T> struct hash;
  template<> struct hash<type_index>;
}

[编辑] std::type_index

namespace std {
  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;
    strong_ordering operator<=>(const type_index& rhs) const noexcept;
    size_t hash_code() const noexcept;
    const char* name() const noexcept;
 
  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.
  };
}