STL:

[Sneha2015]

STL

[MiiNiPaa]

If someone could clarify/rectify the error

error: no match for 'operator<' (operand types are 'const KeyInfo' and 'const KeyInfo')
{ return __x < __y; } " 

It is simple.

If for some type foo following code not compiles:

foo x, y;
x < y;

Then this type cannot be used as key in map without either defining operator< or providing own comparator function to the map.

[Sneha2015]

namespace std
{
template<> struct less<KeyInfo>
{
bool operator() (const KeyInfo& lhs, const KeyInfo& rhs)
{
return lhs.bits < rhs.bits;
}
};
}

Many thanks "MiiNiPaa (8057)" I added the above and it compiles now