delete p

[phztfte1]

I know that the delete p works, but I cannot visualize what is happening. I changed it to delete[] p because I think the memory elements should be delete to prevent a memory leak but that crashes. Please explain what is going on.

#include "std_lib_facilities.h"

int main()
{
	vector<double>* p = new vector<double>(10);
	int n = 0;
	for (double d; cin >> d;) {
		if (n == p->size()) {
			vector<double>* q = new vector<double>(p->size() * 2);
			copy(p->begin(), p->end(), q->begin());
			delete p;	// <-- Please explain to me what this does.  I see this
						// as deleting the pointer value but what about the 
						// elements the pointer points to.
			p = q;
		}
		(*p)[n] = d;
		++n;
	}
}

[helios]

delete[] is only used to delete arrays, which are allocated with new type[size]. p points to an std::vector<double> which is a single object. The fact that this particular type implements a sequence type that can hold multiple objects is of no concern to you. This detail is dealt with by the std::vector implementation.

Rule of thumb: new type[size] has to be matched with a delete[], and new type has to be matched with a delete.

[phztfte1]

Thank you, helios.