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std::type_info::before

性病：：类型[医]信息：：以前

bool before( const type_info& rhs ) const;​​

回报true如果这个类型type_info的类型之前rhs在实现%27排序规则顺序中。不提供任何保证；特别是，排序顺序在同一程序的调用之间可以更改。

参数

rhs-another type information object to compare to

返回值

true如果这个类型type_info的类型之前rhs在实现%27排序规则顺序中。

例

二次

#include <iostream>
#include <typeinfo>
 
int main()
{
  if(typeid(int).before(typeid(char)))
    std::cout << "int goes before char in this implementation.\n";
  else
    std::cout << "char goes before int in this implementation.\n";
}

二次

可能的产出：

二次

char goes before int in this implementation.

二次

另见

operator==operator!=checks whether the objects refer to the same type (public member function)

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