std::type_info::before (3) Linux Manual Page

std::type_info::before – std::type_info::before

Synopsis

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

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

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