1 files changed, 62 insertions, 0 deletions
diff --git a/misc/examples/smartpointers/arc_demo.c b/misc/examples/smartpointers/arc_demo.c
new file mode 100644
index 00000000..929a48a1
--- /dev/null
+++ b/misc/examples/smartpointers/arc_demo.c
@@ -0,0 +1,62 @@
+#include <stdio.h>
+#include <string.h>
+
+void int_drop(int* x) {
+    printf("drop: %d\n", *x);
+}
+
+// carc implements its own clone method using reference counting,
+// so 'i_keyclone' is not required to be defined (ignored).
+
+#define i_type Arc          // set type name to be defined (instead of 'carc_int')
+#define i_key int
+#define i_keydrop int_drop  // optional, just to display the elements destroyed
+#define i_cmp_native        // use int comparison (x < y, x == y).
+#include <stc/carc.h>       // Arc
+
+#define i_keyboxed Arc      // note: use i_keyboxed instead of i_key for carc/cbox elements
+#include <stc/csset.h>      // csset_Arc (like: std::set<std::shared_ptr<int>>)
+
+#define i_keyboxed Arc      // note: as above.
+#include <stc/cvec.h>       // cvec_Arc (like: std::vector<std::shared_ptr<int>>)
+
+int main(void)
+{
+    const int years[] = {2021, 2012, 2022, 2015};
+
+    cvec_Arc vec = {0};
+    c_forrange (i, c_arraylen(years)) {
+        cvec_Arc_emplace(&vec, years[i]);
+        // cvec_Arc_push(&vec, Arc_from(years[i])); // alt.
+    }
+
+    cvec_Arc_sort(&vec);
+
+    printf("vec:");
+    c_foreach (i, cvec_Arc, vec)
+        printf(" %d", *i.ref->get);
+    puts("");
+
+    // add odd numbers from vec to set
+    csset_Arc set = {0};
+    c_foreach (i, cvec_Arc, vec)
+        if (*i.ref->get & 1)
+            csset_Arc_insert(&set, Arc_clone(*i.ref)); // copy shared pointer => increments counter.
+
+    // erase the two last elements in vec
+    cvec_Arc_pop_back(&vec);
+    cvec_Arc_pop_back(&vec);
+
+    printf("vec:");
+    c_foreach (i, cvec_Arc, vec) printf(" %d", *i.ref->get);
+
+    printf("\nset:");
+    c_foreach (i, csset_Arc, set) printf(" %d", *i.ref->get);
+
+    Arc p = Arc_clone(vec.data[0]);
+    printf("\n%d is now owned by %ld objects\n", *p.get, *p.use_count);
+
+    Arc_drop(&p);
+    cvec_Arc_drop(&vec);
+    csset_Arc_drop(&set);
+}