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I try to summarize my C problem as follows:
I have a matrix and I want to be able to use some function to generate its elements.
function has no arguments
Hence I define the following:
typedef double(function)(unsigned int,unsigned int);
/* writes f(x,y) to each element x,y of the matrix*/
void apply(double ** matrix, function * f);
Now I need to generate constant functions within the code. I thought about creating a nested function and returning its pointer, but GCC manual (which allows nested functions) says:
"If you try to call the nested function through its address after the containing function has exited, all hell will break loose."
which I would kind of expect from this code:
function * createConstantFunction(const double value){
double function(unsigned int,unsigned int){
return value;
}
return &function;
}
How can I get it to work?