Deleting a pointer to a vector

Question

I have a const std::vector<double> *vecPtr inside a class. I want to correctly deallocate memory, so what should my destructor look like?

I tried ~ClassA() { delete[] vecPtr; } , but i get an error

*** Error in `./test': free(): invalid pointer: 0x00007fff8c643a98 ***
Aborted (core dumped)

Does delete[] work only if vector is filled with pointers?

EDIT:

I use vecPtr like this: vecPtr = &vec;

If i use just delete i get *** Error in ./test': double free or corruption (fasttop): 0x00000000008fcb20 ***

Answer 1

It depends on how you created vecPtr. If you used vecPtr = new std::vector<double>, you should use delete vecPtr;

If vecPtr is created by array new, such as vecPtr = new std::vector<double>[3];, you should use array delete, delete[] vecPtr;

EDIT

If you used vecPtr = &vec;, and if vec is an auto variable, which used automatic memory, or vec is a static variable or global variable, which used static memory, you should not delete it, it will be deallocated automatically. Only dynamic memory could be deleted.