问题描述
我在全局范围内有一个 myObjects 向量.我有一个方法，它使用 std::vector<myObject>::const_iterator 来遍历向量，并进行一些比较以找到特定元素.找到所需元素后，我希望能够返回指向它的指针(该向量存在于全局范围内).
I have a vector of myObjects in global scope.
I have a method which uses a std::vector<myObject>::const_iterator to traverse the vector, and doing some comparisons to find a specific element.
Once I have found the required element, I want to be able to return a pointer to it (the vector exists in global scope).
如果我返回&iterator，我是返回迭代器的地址还是迭代器指向的地址?
If I return &iterator, am I returning the address of the iterator or the address of what the iterator is pointing to?
我是否需要将 const_iterator 转换回一个 myObject，然后返回它的地址?
Do I need to cast the const_iterator back to a myObject, then return the address of that?
推荐答案
返回迭代器指向的东西的地址:
Return the address of the thing pointed to by the iterator:
&(*iterator)
澄清一些困惑:
vector <int> vec; // a global vector of ints
void f() {
vec.push_back( 1 ); // add to the global vector
vector <int>::iterator it = vec.begin();
* it = 2; // change what was 1 to 2
int * p = &(*it); // get pointer to first element
* p = 3; // change what was 2 to 3
}
不需要指针向量或动态分配.
No need for vectors of pointers or dynamic allocation.
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