I have a vector of class pointers std::vector<Square*> listSquares
. I want to sort it with one of the attributes of the class as the key. This is what I'm doing
bool compById(Square* a, Square* b)
{
return a->getId() < b->getId();
}
std::sort(listSquares.begin(), listSquares.end(), compById)
but the compiler says: error: no matching function for call to 'sort(std::vector::iterator, std::vector::iterator, <unresolved overloaded function type>)'
what am I doing wrong here?
In order to use compById
as a parameter to std::sort
it should not be a member function. This is wrong
class Square
{
bool compById(Square* a, Square* b)
{
return a->getId() < b->getId();
}
...
};
This is better,
class Square
{
...
};
bool compById(Square* a, Square* b)
{
return a->getId() < b->getId();
}