newbie question:why does this code work...

anagram

hi all...
i found this code in some past discussion on this forum.i do not understand why operator overloading is necessary.if i remove it iam getting errors...

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 #include <map>
 
class Keys {

public:

Keys(int k1, int k2)  

{

      key1=k1;

      key2=k2;

 }

bool operator<(const Keys &right) const {

return (key1 < right.key1 && key2 < right.key2);

}

int key1;

int key2;

};
 
int main() {

std::map<Keys, int> mymap;

mymap.insert(std:air<Keys, int>(Keys(3, 8), 5));

return 0;

}

weaknessforcats

You are using a map of Keys objects. A map is a tree of ordered values. The map insert needs to know how to compare objects by calling the < operator to preserve the order.

anagram

i get the gist of what you say.....
but plzzzzz can u explain more about the ordering a lil bit.....
it would be very helpful....

anagram

thank you for the previous explanation...

newbie question:why does this code work...

re: newbie question:why does this code work...

re: newbie question:why does this code work...

re: newbie question:why does this code work...

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