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I have declared typedef void (*DoRunTimeChecks)();
How do I store that as a field in a struct? How do I assign it? How do I call the fn()?
783
Function pointers can be stored in variables, structs, unions, and arrays and passed to and from functions just like any other pointer type. They can also be called: a variable of type function pointer can be used in place of a function name.
Whenever you have pointers inside a structure, you have to use malloc() or calloc() , otherwise they will be stored wherever string constants are stored. Use a pointer to store the address, and use a memory allocation function to allocate just the amount of memory needed for a string.
No, structure supports only a pointer to a function.
Just put it in like you would any other field:
struct example {
int x;
DoRunTimeChecks y;
};
void Function(void)
{
}
struct example anExample = { 12, Function };
To assign to the field:
anExample.y = Function;
To call the function:
anExample.y();
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