Using member functions inside boolean statements.

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Hey. Is there anything I should know about boolean statements and using functions inside them?

Look at this code:

code:

void handle_tac_events(std::vector<Tac>& vTacs, std::vector<Tac>::iterator iter, std::vector<Tac>::iterator end, int& x, int& y, Board& board) {   int result;   for (; iter != end ; ++iter)   {     result = iter->handleEvents(x, y, board);     if (result == MOVED_A_TAC )     {        vTacs.push_back(Tac(iter->getColor(), board));       return;     }     else if (result == CLICKED_A_TAC)     {       return;     }   }   return; }

If i substitute "iter->handleEvents(x, y, board)" with result in the if statements why does it not ever return true? Whereas with result in its place it works fine...