8 files changed, 61 insertions, 11 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index a4659ff6..b86c1879 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -13,8 +13,8 @@ endif()
 
 include(CTest)
 if(BUILD_TESTING)
-	file(GLOB misc/examples misc/examples/*.c)
-	foreach(file IN LISTS misc/examples)
+	file(GLOB_RECURSE examples misc/examples/*.c)
+	foreach(file IN LISTS examples)
 		get_filename_component(name "${file}" NAME_WE)
 		add_executable(${name} ${file})
 		#target_compile_options(${name} PRIVATE "-pthread")
diff --git a/include/stc/algo/coroutine.h b/include/stc/algo/coroutine.h
index f3e42165..84be4a4e 100644
--- a/include/stc/algo/coroutine.h
+++ b/include/stc/algo/coroutine.h
@@ -24,7 +24,6 @@
 #define STC_COROUTINE_INCLUDED
 /*
 #include <stdio.h>
-#include <stdbool.h>
 #include <stc/algo/coroutine.h>
 
 struct iterate {
@@ -61,7 +60,6 @@ int main(void) {
 enum {
     cco_state_final = -1,
     cco_state_expired = -2,
-    cco_state_illegal = -3,
 };
 
 #define cco_alive(ctx) ((ctx)->cco_state > 0)
@@ -74,8 +72,7 @@ enum {
 
 #define cco_end(retval) \
         *_state = cco_state_expired; break; \
-        default: assert(!"illegal coroutine state"); \
-                 goto _cco_final_; /* avoid unused-warning */ \
+        default: goto _cco_final_; /* avoid unused-warning */ \
     } \
     return retval
 
diff --git a/misc/examples/coread.c b/misc/examples/algo/coread.c
index c5f85e08..c5f85e08 100644
--- a/misc/examples/coread.c
+++ b/misc/examples/algo/coread.c
diff --git a/misc/examples/coroutines.c b/misc/examples/algo/coroutines.c
index 2c9e6d5c..2c9e6d5c 100644
--- a/misc/examples/coroutines.c
+++ b/misc/examples/algo/coroutines.c
diff --git a/misc/examples/forfilter.c b/misc/examples/algo/forfilter.c
index 5e1cf15e..5e1cf15e 100644
--- a/misc/examples/forfilter.c
+++ b/misc/examples/algo/forfilter.c
diff --git a/misc/examples/algo/generator.c b/misc/examples/algo/generator.c
new file mode 100644
index 00000000..fce44a52
--- /dev/null
+++ b/misc/examples/algo/generator.c
@@ -0,0 +1,53 @@
+// https://quuxplusone.github.io/blog/2019/03/06/pythagorean-triples/
+
+#include <stc/algo/coroutine.h>
+#include <stdio.h>
+
+typedef struct {
+    int n;
+    int a, b, c;
+} Triple_value, Triple;
+
+typedef struct {
+    Triple_value* ref;
+    int cco_state;
+} Triple_iter;
+
+bool Triple_next(Triple_iter* it) {
+    Triple_value* t = it->ref;
+    cco_begin(it);
+        for (t->c = 1;; ++t->c) {
+            for (t->a = 1; t->a < t->c; ++t->a) {
+                for (t->b = t->a; t->b < t->c; ++t->b) {
+                    if (t->a*t->a + t->b*t->b == t->c*t->c) {
+                        cco_yield(true);
+                        if (t->n-- == 1) cco_return;
+                    }
+                }
+            }
+        }
+        cco_final:
+            it->ref = NULL;
+    cco_end(false);
+}
+
+Triple_iter Triple_begin(Triple* t) {
+    Triple_iter it = {t}; 
+    if (t->n > 0) Triple_next(&it);
+    else it.ref = NULL;
+    return it;
+}
+
+
+int main()
+{
+    puts("Pythagorean triples with c < 100:");
+    Triple t = {INT32_MAX};
+    c_foreach (i, Triple, t)
+    {
+        if (i.ref->c < 100)
+            printf("%u: (%d, %d, %d)\n", INT32_MAX - i.ref->n + 1, i.ref->a, i.ref->b, i.ref->c);
+        else
+            (void)cco_stop(&i);
+    }
+}
diff --git a/misc/examples/prime.c b/misc/examples/algo/prime.c
index e705dcb7..e705dcb7 100644
--- a/misc/examples/prime.c
+++ b/misc/examples/algo/prime.c
diff --git a/misc/examples/triples.c b/misc/examples/algo/triples.c
index 0ce0eb37..8a46d653 100644
--- a/misc/examples/triples.c
+++ b/misc/examples/algo/triples.c
@@ -17,13 +17,13 @@ void triples_vanilla(int n) {
     done:;
 }
 
-struct tricoro {
+struct triples {
     int n;
-    int cco_state;
     int x, y, z;
+    int cco_state;
 };
 
-bool triples_coro(struct tricoro* t) {
+bool triples_coro(struct triples* t) {
     cco_begin(t);
         for (t->z = 1;; ++t->z) {
             for (t->x = 1; t->x < t->z; ++t->x) {
@@ -46,7 +46,7 @@ int main()
     triples_vanilla(6);
 
     puts("\nCoroutine triples:");
-    struct tricoro t = {6};
+    struct triples t = {6};
     while (triples_coro(&t))
         printf("{%d, %d, %d},\n", t.x, t.y, t.z);
-}
\ No newline at end of file
+}