重载向量下标运算符以采用char *或字符串 [英] Overload vector subscript operator to take a char * or string

问题描述

我试图重载下标运算符-我知道它是元素访问运算符-以采用char *或std :: string.

I am trying to overload the subscript operator -i know it as the element access operator- to take a char * or a std::string.

我有一个结构

struct foo
{
    int Age;
    const char *Name;
};

和一个std :: vector，它将保存该结构的多个实例.

and a std::vector that will be holding multiple instances of this struct.

std::vector<foo>bar;

我的目标是能够通过按其名称调用它们来访问bar中的每个foo.

my goal is to be able to access each foo in bar by calling them by their name.

std::cout<<"Simon's age is: "<<bar["simon"];

我一直在搜索google很长时间，试图找到一个例子或有待解决的事情，但是没有运气.

I've just been searching google for a long while trying to find an example or something to go off, with no luck.

我认为这会起作用

foo operator[](char *Name)
{
    for(int i=0;i<bar.size();i++)
    {
        if(bar[i].Name == Name){return bar[i];}
    }
}

但是显然我在做错事

我确实知道这可以通过std :: map来完成，但是我宁愿使用std :: vector，谢谢.

I do know this could be done with an std::map but i'd rather use an std::vector, thanks.

非常感谢您的帮助，但是您选择提供它.谢谢.

I would greatly appreciate your help however you choose to offer it. Thank you .

推荐答案

要执行所需的操作，需要从std :: vector继承.否则，您将无法重载其方法.

To do what you want requires inheriting from std::vector. Otherwise you can't overload its methods.

类似以下内容(未经测试).

Something like the following (untested).

struct fooVector : public std::vector<foo> {
    typedef std::vector<foo> super;
    using super::size;
...
    foo& operator[](char const* Name) {
       super& self=*this;
       for(int i=0;i<size();i++)
       {
           if( ! strcmp( self[i].Name, Name) ){return self[i];}
       }
       // Need to do something reasonable if not found
    }
};

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