Inject in C

fold.c

#include <stdio.h>
#include <stdlib.h>

struct node{
	void* data;
	struct node* next;
};

void set_int_value(struct node* node, int val)
{
	// ptr->data est de type void*
	int* i = malloc(sizeof (int));
	*i = val;
	node->data = i;
}

// Permet de créer une liste chainée {1,2,3}
struct node* create_basic_list()
{
	size_t node_size = sizeof (struct node);
	
	struct node* element1 = malloc(node_size);
	struct node* element2 = malloc(node_size);
	struct node* element3 = malloc(node_size);

	element1->next = element2;
	element2->next = element3;
	element3->next = NULL;

	set_int_value(element1, 1);
	set_int_value(element2, 2);
	set_int_value(element3, 3);

	return element1;
}

void* fold(struct node* head, void* acc, void*(*fun)(void*, void*)){
	struct node* current = head;
	while(current){
		acc = fun(acc, current->data);
		current = current->next;
	}
	return acc;	
}

void* add(void* a, void* b)
{
	int* i = malloc(sizeof (int));
	*i = *((int*)a) + *((int*)b);
	return i;
}

void* sum(struct node* head)
{
	int* seed = malloc(sizeof (int));
	*seed = 0;
	return fold(head, seed, add);
}

void map(struct node* head, void(*fun)(void*))
{
	struct node* current = head;
	while(current){
		fun(current->data);
		current = current->next;
	}	
}	

void print_int(void* val){
	printf("%d\n", *((int*)val));
}

void print(struct node* head)
{
	map(head, print_int); 
}

int main(void)
{	
	struct node* l = create_basic_list();
	print_int(sum(l));	
}