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Callbacks in C
The callback is basically any executable code that is passed as an argument to other code, that is expected to call back or execute the argument at a given time. We can define it in other words like this: If the reference of a function is passed to another function argument for calling, then it is called the callback function.
In C we have to use a function pointer to call the callback function. The following code is showing how the callback function is doing its task.
Example Code
#include<stdio.h>
void my_function() {
printf("This is a normal function.");
}
void my_callback_function(void (*ptr)()) {
printf("This is callback function.
");
(*ptr)(); //calling the callback function
}
main() {
void (*ptr)() = &my_function;
my_callback_function(ptr);
}Output
This is callback function. This is a normal function.
Updated on: 30-Jul-2019
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