问题
I have a very quick question: What is the difference between new[ ] / delete [ ] vs new / delete in C++ when it comes to Dynamic memory?
Is new[ ] / delete [ ] not belong to Dynamic memory?
回答1:
new allocates memory for a single item and calls its constructor, and delete calls its destructor and frees its memory.
new[] allocates memory for an array of items and calls their constructors, and delete[] calls their destructors and frees the array memory.
回答2:
Both memory allocation mechanisms work with dynamic memory. The former creates/destroys a single object, the second creates/destroys a run-time sized array of objects. That's the difference.
Other than that, these two mechanisms are two completely separate independent dynamic memory management mechanisms. E.g. allocating an array consisting of 1 element using new[] is not equivalent to simply using new.
回答3:
the difference detween the two is that those with [] are those for array.
The difference is not that visible for the new keyword as there is no error possible
int *i = new int;
Object *array = new Object[100];
however you should make shure to call the good one to make shure destructor are called has the should
delete i; // ok
delete[] array; //ok
delete array; // Careffull, all destructors may not be called
来源：https://stackoverflow.com/questions/28651860/difference-between-new-delete-vs-new-delete-in-c