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std::type_info:: before

From cppreference.net
C++
Utilities library
Type support
std::type_info
bool before ( const type_info & rhs ) const ;
(noexcept since C++11)

Returns true if the type of this type_info precedes the type of rhs in the implementation's collation order. No guarantees are given; in particular, the collation order can change between the invocations of the same program.

Contents

Parameters

rhs - another type information object to compare to

Return value

true if the type of this type_info precedes the type of rhs in the implementation's collation order.

Example

Run this code 
#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";
}

Possible output: 

char goes before int in this implementation.

See also

(removed in C++20)
checks whether the objects refer to the same type
(public member function)