I've read in some tutorials about maps that when you want to use a class in a map and you want to acces the map with an iterator you have to overload the < operator. I've done that and the overloaded operator works. But when I try to compile the program with that class in a map it doesn't work.
I get this error:
In function `int main()':|
no match for 'operator<' in 'loop < (&mymap)->std::map<_Key, _Tp, _Compare, _Alloc>::end [with _Key = std::string, _Tp = myclass, _Compare = std::less<std::string>, _Alloc = std::allocator<std::pair<const std::string, myclass> >]()'|
#include <iostream>
#include <map>
using namespace std;
class myclass
{
public:
int something;
bool operator < ( myclass temp)
{
return (something<temp.something);
}
};
int main()
{
std::map<string, myclass> mymap;
mymap["apple"].something = 0;
mymap["banana"].something = 1;
mymap["cherry"].something = 2;
if (mymap["apple"] < mymap["banana"])
{
cout << "The < operator works." << endl;
}
for(map<string, myclass>::iterator loop = mymap.begin() ; loop < mymap.end() ; ++loop)
{
cout << loop->second.something << endl;
}
return 0;
}
