SameXandY

A functor that sees if a certain class has equal X and Y values.

#include <cassert>

#include <functional>

#include <vector>

#include <algorithm>

struct Player

{

Player(const int anyX, const int anyY) : x(anyX), y(anyY) {}

int x,y;

//And more...

};

//From http://www.richelbilderbeek.nl

template <class T>

struct SameXandY : public std::unary_function<T,bool>

{

explicit SameXandY(const T& position) : mPosition(position) {}

bool operator()(const T& position) const

{

return position.x == mPosition.x && position.y == mPosition.y;

}

private:

const T mPosition;

};

int main()

{

std::vector<Player> v;

for (int i=0; i!=10; ++i) v.push_back(Player(i,i));

assert( std::find_if(v.begin(), v.end(), SameXandY<Player>(Player(3,5))) == v.end());

assert( std::find_if(v.begin(), v.end(), SameXandY<Player>(Player(5,5))) != v.end());

}