This is an intentional design in the generated code and the users dont have control over it to change this behaviour as of today.
Reason for the design :
In the current design, the caller function will need to create the pointer (memory) and owns it. Memory creating and the deletiong is done in the same function.
int main {
// Allocate input and output memory
int *input = (int*)(calloc(10,sizeof(int)));
int *output = (int*)calloc(10,sizeof(int)));
for (i =0;i<10;++i) {
// Fill the input
input[i] = i;
}
// Use the generated code
foo(input,output);
// Do something
//Destroy the memory
free(input);
free(output);
}
If you return the pointer as output, that pointer needs to be created inside the function, so the ownership of the memory is not clear.
int* foo(int *input) {
// does something
// Allocates the memory
int *out = (int *)(calloc(numel,sizeof(int)); // Who owns this memory ? this may be leaked.
return out; // Also the size information is lost due to array decaying into pointer.
}
The generated code contains an example main.c file which shows a sample use of the generated function. You can take a look at it :
https://www.mathworks.com/help/coder/ug/generate-and-modify-an-example-cc-main-function.html#buod5pb
Hope this will help you.
