访问向量中的类成员 [英] Accessing class member inside a vector

问题描述

您好我是C ++的新手

我有一个矢量迭代器它，里面有一个A类，类有双变量b。

我需要访问变量所以我写了这样的东西：

It.A-> b

但它给我带来了不同的错误。

有人能告诉我正确的格式吗？

Hi I am new to C++
I have a vector iterator It, which has a Class A inside it and class has double variable b.
I need to access the variable so I wrote something like this:
It.A->b
but its throwing me different errors.
can someone tell me the correct format?

推荐答案

你需要取消引用迭代器。你想要的是

You need to dereference the iterator. What you want is

*It->b

[rev.1 - 对不起，语法错误，希望修复...]

[rev.1 - sorry, syntax error, hopefully fixed...]

作为一个评论，我不会使用带向量的迭代器，但是只需使用索引。例如：

Just as a remark, I would not use an iterator with a vector, but just use the index. For example:

    std::vector<double> vec;
    ...
    double d = vec[i];
</double>

如果你坚持使用迭代器，那么把它想象成一种指针（语法方面），因此你将其取消引用为：

If you insist in using an iterator, then think of it as being kind of a pointer (syntax wise), and hence you would dereference it as:

    std::vector<mystruct> vec;
    ...
    MyStruct* p = it;
    ... or if age is a member of MyStruct
    int age = it->age;
</mystruct>

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