From 9058dd37ee3eda1dc004e07218cd8115e3fa4f09 Mon Sep 17 00:00:00 2001
From: Tyge Løvset <tylo@norceresearch.no>
Date: Thu, 23 Sep 2021 09:11:27 +0200
Subject: Added sptr_ex.c example + minors.

---
 docs/csptr_api.md      |  4 ++--
 examples/sptr_ex.c     | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++
 include/stc/template.h |  4 ++--
 3 files changed, 69 insertions(+), 4 deletions(-)
 create mode 100644 examples/sptr_ex.c

diff --git a/docs/csptr_api.md b/docs/csptr_api.md
index 5c15fae4..d1157162 100644
--- a/docs/csptr_api.md
+++ b/docs/csptr_api.md
@@ -76,8 +76,8 @@ void int_del(int* x) {
 #define i_key_csptr int   // refer to csptr_int definition above
 #include <stc/csset.h>    // define a sorted set of csptr_int
 
-#define i_val_csptr int
-#include <stc/cvec.h>     // define a sorted vector of csptr_int
+#define i_val_csptr int   // refer to csptr_int definition above
+#include <stc/cvec.h>     // define a vector of csptr_int
 
 int main()
 {
diff --git a/examples/sptr_ex.c b/examples/sptr_ex.c
new file mode 100644
index 00000000..4a0397ec
--- /dev/null
+++ b/examples/sptr_ex.c
@@ -0,0 +1,65 @@
+// shared_ptr-examples.cpp
+// based on https://docs.microsoft.com/en-us/cpp/cpp/how-to-create-and-use-shared-ptr-instances?view=msvc-160
+
+#include <stdio.h>
+#include <stc/cstr.h>
+#include <stc/forward.h>
+
+forward_csptr(song, struct Song);
+struct Test {
+    csptr_song song1;
+    csptr_song song2;
+};
+
+// ...
+
+struct Song
+{
+    cstr artist;
+    cstr title;
+} typedef Song;
+
+Song Song_from(const char* artist, const char* title)
+    { return (Song){cstr_from(artist), cstr_from(title)}; }
+
+void Song_del(Song* s) {
+    printf("del: %s\n", s->title.str);
+    c_del(cstr, &s->artist, &s->title);
+}
+
+#define i_val Song
+#define F_tag song
+#define i_cmp c_no_compare
+#define i_del Song_del
+#include <stc/csptr.h>
+
+#define i_val_csptr song
+#include <stc/cvec.h>
+
+void example3()
+{
+    c_auto (cvec_song, v, v2) {
+        csptr_song songs[] = {
+            csptr_song_make(Song_from("Bob Dylan", "The Times They Are A Changing")),
+            csptr_song_make(Song_from("Aretha Franklin", "Bridge Over Troubled Water")),
+            csptr_song_make(Song_from("Thalia", "Entre El Mar y Una Estrella"))
+        };
+        c_forrange (i, c_arraylen(songs))
+            cvec_song_push_back(&v, songs[i]);
+
+        c_foreach (s, cvec_song, v)
+            if (!cstr_equalto(s.ref->get->artist, "Bob Dylan"))
+                cvec_song_emplace_back(&v2, *s.ref); // calls csptr_song_clone()
+
+        cvec_song_push_back(&v2, csptr_song_make(Song_from("Pink Floyd", "Dogs")));
+
+        c_foreach (s, cvec_song, v2)
+            printf("%s - %s: refs %zu\n", s.ref->get->artist.str, s.ref->get->title.str,
+                                          *s.ref->use_count);
+    }
+}
+
+int main()
+{
+    example3();
+}
\ No newline at end of file
diff --git a/include/stc/template.h b/include/stc/template.h
index c207ae56..cc3e028f 100644
--- a/include/stc/template.h
+++ b/include/stc/template.h
@@ -139,8 +139,8 @@
   #ifndef i_keydel
     #define i_keydel c_default_del
   #endif
-#elif defined i_keydel || defined i_keyfrom || defined i_keyraw || defined i_hash || defined i_equ
-  #warning i_key-related definitions without i_key are ignored.
+#elif defined i_isset || defined i_keydel || defined i_keyfrom || defined i_keyraw || defined i_hash || defined i_equ
+  #error i_key define is missing.
 #endif
 
 #ifndef i_tag
-- 
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