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-rw-r--r--example.c95
1 files changed, 95 insertions, 0 deletions
diff --git a/example.c b/example.c
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+++ b/example.c
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+#include "functional.h"
+#define MAX_STR_SIZE 400
+
+typedef struct {
+ unsigned int age;
+ char* name;
+} Person;
+
+bool shouldIncludePerson(FunctionalArgs* args) {
+ const char* toExclude = args->ctxp;
+ Person* first = args->arr;
+ Person* p = &first[args->i];
+ return p->age > 30 && strcmp(toExclude, p->name);
+}
+
+void* derefPerson(int i, void* arr) {
+ Person* p = arr;
+ return (void*)&p[i];
+}
+
+int stringifyPerson(Person* p, char* out, size_t n) {
+ return snprintf(out, n, "Person %s is %d years of age, yo\n", p->name,
+ p->age);
+}
+
+void printPerson(Person* p) {
+ char personStr[MAX_STR_SIZE];
+ stringifyPerson(p, personStr, MAX_STR_SIZE);
+ printf("%s", personStr);
+}
+
+void shiftPersonLeft(FunctionalArgs* args) {
+ Person* people = args->arr;
+ for (int i = args->i; i < args->n - 1; i++) {
+ people[i] = people[i + 1];
+ }
+ args->n--;
+}
+
+void mapPersonToAge(FunctionalArgs* args) {
+ int* storage = args->storage;
+ Person* people = args->arr;
+ storage[args->i] = people[args->i].age;
+}
+
+void copyPerson(FunctionalArgs* args) {
+ Person* src = args->arr;
+ Person* dest = args->storage;
+ dest[args->i - args->offset] = src[args->i];
+}
+
+void mapExample(Functional* f) {
+ func_map(f);
+ for (int i = 0; i < f->args.n; i++) {
+ int* ages = f->args.storage;
+ printf("age[%d] = %d\n", i, ages[i]);
+ }
+}
+
+void filterExample(Functional* f) {
+ func_filter(f);
+ for (int i = 0; i < f->args.n; i++) {
+ Person* people = f->args.storage;
+ printPerson(&people[i]);
+ }
+}
+
+void findExample(Functional* f) {
+ Person* olderAndNotHarry = func_find(f);
+ printPerson(olderAndNotHarry);
+}
+
+int main() {
+ Person people[] = {{.age = 19, .name = "Alex"},
+ {.age = 42, .name = "Jenna"},
+ {.age = 55, .name = "Tom"}};
+ int ages[3];
+ Person filteredPeople[3];
+ Functional func = {
+ .args = {.i = 0,
+ .n = 3,
+ .arr = (void*)people,
+ .ctxp = (void*)"Harry",
+ .storage = filteredPeople},
+ .filter = shouldIncludePerson,
+ .map = copyPerson,
+ .derefInput = derefPerson,
+ };
+ findExample(&func);
+ filterExample(&func);
+ func.args.storage = ages;
+ func.map = mapPersonToAge;
+ func.args.n = 3;
+ mapExample(&func);
+}