Last active
October 21, 2016 08:55
-
-
Save x4x/a70dde9ca317aa1d10f77d19f4223ff3 to your computer and use it in GitHub Desktop.
minimalistic list event handler in C++
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/** | |
* minimalistic event handler | |
* @author x4x | |
* @version 0.2a | |
**/ | |
#include <iostream> | |
using namespace std; | |
//#include <cstddef> | |
#include <stddef.h> | |
// event handler | |
class Handler | |
{ | |
private: | |
// linkd list for event pointers | |
struct node { | |
void (*event)(void); | |
node *next; | |
}; | |
node *root = NULL; | |
node *ptr = NULL; | |
// get last node. | |
node last() { | |
ptr = root; | |
if ( !ptr ) { //< exists a first element? | |
while( ptr->next ) { //< go to last element. | |
ptr = ptr->next; | |
} | |
return *ptr; | |
} | |
return *root; | |
} | |
public: | |
// append a event to be executed. | |
void append_event( void (*event)() ) { | |
if( !root ) { //< exists a root element | |
root = new node; //< create first element | |
ptr = root; | |
} else { | |
*ptr = last(); //< go to last element | |
ptr->next = new node; //< append new element | |
ptr = ptr->next; //< go to apendet element | |
} | |
ptr->next = NULL; //< set NULL ptr | |
ptr->event = event; //< set ptr to event | |
} | |
void trigger() { | |
ptr = root; //start with root | |
while( ptr ) { | |
(*ptr->event)(); //< execute element | |
ptr = ptr->next; //< goto next element | |
} | |
} | |
}; | |
// Test: | |
void hallo() { //< test function | |
cout << "hallo" << endl; | |
} | |
int main() { //< tests | |
Handler handler; | |
//hallo(); | |
handler.append_event( &hallo ); | |
handler.append_event( &hallo ); | |
handler.trigger(); | |
return 0; | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment