std::type_info::before - cppreference.com

bool before( const type_info& rhs ) const;

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.

Parameters

Return value

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

Example

#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";
}

char goes before int in this implementation.

See also