Vectors, structs and std::find

Question

Again me with vectors. I hope I'm not too annoying. I have a struct like this :

struct monster  {     DWORD id;     int x;     int y;     int distance;     int HP; }; 

So I created a vector :

std::vector<monster> monsters; 

But now I don't know how to search through the vector. I want to find an ID of the monster inside the vector.

DWORD monster = 0xFFFAAA; it = std::find(bot.monsters.begin(), bot.monsters.end(), currentMonster); 

But obviously it doesn't work. I want to iterate only through the .id element of the struct, and I don't know how to do that. Help is greatly appreciated. Thanks !

Answer 1

std::find_if:

it = std::find_if(bot.monsters.begin(), bot.monsters.end(),          boost::bind(&monster::id, _1) == currentMonster); 

Or write your own function object if you don't have boost. Would look like this

struct find_id : std::unary_function<monster, bool> {     DWORD id;     find_id(DWORD id):id(id) { }     bool operator()(monster const& m) const {         return m.id == id;     } };  it = std::find_if(bot.monsters.begin(), bot.monsters.end(),           find_id(currentMonster));