标准向量 C++——深拷贝或浅拷贝 [英] std vector C++ -- deep or shallow copy

问题描述

我想知道是否复制向量我正在复制向量及其值(而这不适用于数组，并且深度复制需要循环或 memcpy).

I wonder whether copying a vector I am copying the vector with its values (whereas this is not working with array, and deep copy need a loop or memcpy).

你能提示解释吗?

问候

推荐答案

每次复制向量时，您都在进行深层复制.但是，如果您的向量是指针向量，则您将获得指针的副本，而不是指向的值

You are making a deep copy any time you copy a vector. But if your vector is a vector of pointers you are getting the copy of pointers, not the values are pointed to

例如:

std::vector<Foo> f;
std::vector<Foo> cp = f; //deep copy. All Foo copied

std::vector<Foo*> f;
std::vector<Foo*> cp = f; //deep copy (of pointers), or shallow copy (of objects).
//All pointers to Foo are copied, but not Foo themselves

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