Vectors，structs和std :: find [英] Vectors, structs and std::find

问题描述

再次，我用向量。我希望我不是太烦人了我有一个这样的结构：

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

所以我创建了一个向量：

  std :: vector< monster>怪物
  

但现在我不知道如何通过向量搜索。我想在矢量中找到怪物的ID。

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

但显然它不起作用。我只想通过结构体的.id元素进行迭代，我不知道该怎么做。帮助非常感谢。谢谢！

解决方案

std :: find_if ：

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

或者如果没有boost，则编写自己的函数对象。看起来像这样

  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））; 
  

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 !

解决方案

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));

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