NAME

std::type_info::before - std::type_info::before

Synopsis

bool before( const type_info& rhs ) const; (until C++11)
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.

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

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