const declaration problem

[vvarma]

I have a piece of code whose skeleton is as follows:

//all necessary includes

size_t fact(int i){
if (i==0) return(1);
else return(i*fact(i-1));
}

main(){
//some definitions
int* R;
const size_t N = 8;

const size_t Cmbnts = fact(2*N-1)/((fact(N))*(fact(N-1))); //Call this line Line-ABC
vector< vector<int> > basis(Cmbnts, vector<int>(N,0)); // Call this line Line-XYZ

for(;;){
//call to function next_combo and a necessary break, which uses neither basis nor Cmbnts
//code lines ...

R = next_combo(//relevant arguments, none including Cmbnts or basis)
cout<<"Checkpoint 2"<<endl;

//...more code lines ...
}

}

Now when I comment Line-ABC and Line-XYZ, the program compiles and runs and gives me the output as expected. But if I uncomment either Line-ABC or Line-XYZ (in the former case, I take care to replace Cmbnts appearing in Line-XYZ by a number), the program compiles but gives me a Segmentation Fault, even though neither Cmbnts nor basis are used by the function next_combo.

I have included Cmbnts and basis for further expanding the code, but am not currently using them anywhere (that they are not used anywhere is guaranteed because if I simply comment Line-ABC and Line-XYZ, I get the right output). With either line uncommented, the program calculates the value Cmbnts correctly, runs till a single call of next_combo, and throws out SegmentationFault. "Checkpoint 2" does not get printed, but "Checkpoint 1" which is within the last few lines of next_combo does get printed.

Also if I remove the empty-for-loop completely, the program runs without any SegmentationFault (without giving me the output that I want also, of course).

Any ideas will be appreciated; I have exhausted myself of ideas.

[jsmith]

fact(2*N-1) for N=8 overflows the size_t type.