向量、结构和 std::find

问题描述

再次使用向量.我希望我不会太烦人.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搜索向量.我想在向量中找到怪物的 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);

但显然它不起作用.我只想遍历结构的 .id 元素，但我不知道该怎么做.非常感谢帮助.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);

如果没有boost，也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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