队列< string&>错误 [英] queue<string&> errors

问题描述

我有一个有趣的情况。

我有一堆容纳字符串的结构。

I have a bunch of structs that hold a string.

struct foo
{
    string mStringName;
}
vector<foo> mFoos;

我也有一个字符串引用队列

I also have a queue of string references

queue<string&> mStringQueue;

最后，我有一个接受const字符串的函数&

And finally, I have a function that accepts a const string&

void Bar(const string&);

在此情况。

//...in some loop
currentFoo = mFoos[index];

// Queue up the string name.
mStringQueue.push(currentFoo.mStringName);


//...Later on, go through our queue and pass each one to the function.

for (int queueIndex = 0; queueIndex < mStringQueue.size(); queueIndex++)
{
    Bar(mStringQueue.front());
    mStringQueue.pop();
}

这给了我以下编译错误：

This gives me the following compile error:

错误C2664：'std :: queue< _Ty> :: push'：无法将参数1从'String'转换为'String&（&）'

error C2664: 'std::queue<_Ty>::push' : cannot convert parameter 1 from 'String' to 'String &(&)'

我在definitley方面难以解决字符串引用之类的问题，因此将不胜感激

I'm definitley having trouble wrapping my mind around string references and whatnot, so any help would be greatly appreciated

推荐答案

引用类型不符合可在标准容器中使用的类型的要求。特别是它们不可复制。请注意，尽管引用的对象可以复制，但不能复制。

Reference types do not meet the requirements of types that can be used in standard containers. In particular they are not copyable. Note that while the referenced object can be copyable or not, the reference itself is never copyable.

另一种方法是存储 pointers ，可复制的。

The alternative is to store pointers, which are copyable.

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