std::map operator<

[Chris Forone]

how is it possible with a userdefined class with the only overloaded
operator< (less than) to find the right object (function .find could not
know if greater or equal)?

thanks for your patience

 

[Kai-Uwe Bux]

how is it possible with a userdefined class with the only overloaded
operator< (less than) to find the right object (function .find could not
know if greater or equal)?

Two keys a and b are considered equal if neither a < b nor b < a. The
requirement that operator< defines a strict weak ordering ensure that

a ~ b := ( neither a < b nor b < a )

defines an equivalence relation.


Best

Kai-Uwe Bux

 

[Chris Forone]

Two keys a and b are considered equal if neither a < b nor b < a. The
requirement that operator< defines a strict weak ordering ensure that

a ~ b := ( neither a < b nor b < a )

defines an equivalence relation.


Best

Kai-Uwe Bux

wow thanx a lot!!!