当向量被分配时，它们使用堆或堆栈上的内存吗？ [英] When vectors are allocated, do they use memory on the heap or the stack?

问题描述

以下所有语句是否真实？

Are all of the following statements true?

vector<Type> vect; //allocates vect on stack and each of the Type (using std::allocator) also will be on the stack

vector<Type> *vect = new vector<Type>; //allocates vect on heap and each of the Type will be allocated on stack

vector<Type*> vect; //vect will be on stack and Type* will be on heap. 

内部分配的内存类型在向量或任何其他STL容器中？

How is the memory allocated internally for Type in a vector or any other STL container?

推荐答案

vector<Type> vect;

将分配向量 info，而是在自由存储（heap）上的元素。

will allocate the vector, i.e. the header info, on the stack, but the elements on the free store ("heap").

vector<Type> *vect = new vector<Type>;

分配免费商店中的一切。

allocates everything on the free store.

vector<Type*> vect;

将在堆栈上分配向量在自由存储上的一堆指针，但是这些点是由你如何使用它们（你可以将元素0指向自由存储和元素1指向堆栈，说）决定。

will allocate the vector on the stack and a bunch of pointers on the free store, but where these point is determined by how you use them (you could point element 0 to the free store and element 1 to the stack, say).

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