resize dynamic memory problem

[ylxin1993]

I want to implement the class FloatArray's resize function

class FloatArray {
private:
    float * mDate;
    int mSize;
public:
    void resize(int newSize);
}

Is this right??
I wonder whether I need to use the delete[], but I can't find out when or whether use this;

void FloatArray::resize(int newSize) {
	mData = new float[newSize];
	if(newSize >= mSize) {
		// copy old elements to new array
	    for(int i = 0; i < mSize; i++)
		newArray[i] = mData[i];
	} else {	// new array is a lesser size than old array
	    for(int i = 0; i < newSize; i++)
		newArray[i] = mData[i];
	}
}

[DSLq5Di1]

I wonder whether I need to use the delete[]

Yes!

This mData = new float[newSize]; is a memory leak, any previously allocated memory pointed to by mData is lost until the application exits.

	if (newSize > 0) // sanity check, I would also avoid resizing if the new size is less than or equal to mSize.
	{
		float * newArray = new float[newSize]
		// copy old elements to new array
		...

		delete[] mData; // delete the old array
		mData = newArray; // assign the pointer to the new array
		mSize = newSize;
	}

[ylxin1993]

but if my FloatArray object have some values ,when I use the resize function, I want to copy the value to my newsize, what should I do?( I don't know where to use the delete [] .)