illegal constant expression

[AndreAhmed]

Hi,
I'm trying to compile QQrdecoder using Carbide and QT , but there are many compile errors
illegal constant expression

	int* ITFReader::findGuardPattern(Ref<BitArray> row, int rowOffset, const int pattern[], int patternLen){
			// TODO: This is very similar to implementation in UPCEANReader. Consider if they can be
			// merged to a single method.
			 int patternLength = patternLen;
			int counters[patternLength];

[danhicksbyron]

You're declaring the array "counters" with a size of "patternLength", which isn't a constant as required.

Have you ever programmed in C before?

[AndreAhmed]

I did define it as const and its still gives the same error , illegal constant expression

[laa-laa]

A const variable is still a variable and not a compile-time constant. Stack-based allocation needs to know the space requirements at compile time. To allocate dynamically, use heap-based allocation such as operator new:

int *counters = new int[patternLength];

[danhicksbyron]

Of course, then he needs to be sure to delete the counters object on exit. A better approach is to use a QArray<int>, unless performance is critical.