Reshaping A Dynamic Array Using Function Parameters

Question

Today I found this is in an example file given to me by a company:

void mySgemm( int m, int n, int k, float alpha, float beta, float a[m][n],   float b[n][k], float c[m][k], int accelerate )

Called with:

a_cpu = malloc(..);
b_cpu = malloc(..);
c_cpu = malloc(..);
mySgemm(m, n, k, a, b, a_cpu, b_cpu, c_cpu, true);

I can't compile my own similar example, frankly I've never even seen someone take a dynamic array and shape it as such using the function parameters themselves.

Is this a legal call?

What boggles my mind is that in the mySgemm function they access a,b,c as double arrays, so the array is essentially being reshaped!?

It is not legal in C++. C++ has no variable-size arrays. It could be legal in C99, depending on how things are declared. — n. m. could be an AI, Apr 11 '13 at 20:10

score 1 · Accepted Answer · answered Apr 11 '13 at 20:14

1

no, it's not valid c++.

i guess the formal argument declarations would pass in c99, as variadic arrays, but i'm not so sure that the actual arguments for those would be accepted

answered Apr 11 '13 at 20:14

Cheers and hth. - Alf

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*actual arguments for those would be accepted* They would not. – Apr 11 '13 at 20:15

Reshaping A Dynamic Array Using Function Parameters

1 Answers1