while loop and vector.erase()

[Fresh Grass]

I'm using VS 2010 and I have a problem with this part of code:

getElement returns an element at i, delElement erases elements at between (and including) i and i+1.

i = 0;
	while(obj.getElement(i)) {
		switch (obj.getElement(i)) {
		case 1:
			obj.setElement(/*...*/, i-1); //assigns a value to an
			obj.delElement(i, i+1);       //element at i-1
			obj.delElement(i, i+1);
			break;
// ...
		default:
			++i;
		}
	}

I think the problem is that I'm deleting an element which is the condition/statement for the loop and the switch, even though the program shouldn't perform any while or switch checks at the time. I think what happens next is that the program goes to another match, even though it should clearly perform a break - it goes to default and increments i by 1. I tested this with breakpoints and it seems like it does at least something similar. For example, the code below works, because I'm deleting and incrementing outside of the switch:

i = 0;
	bool flag = false;
	while(obj.getElement(i)) {
		switch (obj.getElement(i)) {
		case 1:
			obj.setElement(//...//);
			flag = true;
			break;
// ...
		}
		if (flag) {
			obj.delElement(i, i+1);
			obj.delElement(i, i+1);
		} else ++i;
	}

Is this problem a standard or am I doing something wrong?

[ne555]

I don't see where you reset your flag in the second code.

Are you sure that delElement has range [ ] instead of [ ) ?
You could collapse the two deletes into one.

I think the problem is that I'm deleting an element which is the condition/statement for the loop and the switch

Doesn't matter, the check was before the delete.

I tested this with breakpoints and it seems like it does at least something similar.

I don't understand you here. Was i always incrementing?