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。我有一个这样的结构：

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;
};

所以我创建了一个向量：

So I created a vector :

std::vector<monster> monsters;

但现在我不知道如何通过向量搜索。我想在向量中找到一个怪物的ID。

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);

但显然它不工作。我想只通过结构的.id元素进行迭代，我不知道如何做。帮助非常感谢。谢谢！

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 !

推荐答案

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，可以编写自己的函数对象。看起来像这样

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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