Improved docs/ex. Fix range bug when container is empty cvec/cdeq.

1 files changed, 5 insertions, 4 deletions

diff --git a/include/stc/cvec.h b/include/stc/cvec.h
index c734abb6..170bf741 100644
--- a/include/stc/cvec.h
+++ b/include/stc/cvec.h
@@ -66,6 +66,7 @@ int main() {
 
 struct cvec_rep { size_t size, cap; unsigned data[1]; };
 #define cvec_rep_(self) c_unchecked_container_of((self)->data, struct cvec_rep, data)
+#define it2_ref_(it1, it2) (it1.ref && !it2.ref ? it2.end : it2.ref)
 #endif // CVEC_H_INCLUDED
 
 #ifndef _i_prefix
@@ -181,7 +182,7 @@ _cx_memb(_erase_at)(_cx_self* self, _cx_iter it) {
 }
 STC_INLINE _cx_iter
 _cx_memb(_erase_range)(_cx_self* self, _cx_iter i1, _cx_iter i2) {
-    return _cx_memb(_erase_range_p)(self, i1.ref, (i2.ref ? i2.ref : i2.end));
+    return _cx_memb(_erase_range_p)(self, i1.ref, it2_ref_(i1, i2));
 }
 
 STC_INLINE const _cx_value*
@@ -242,7 +243,7 @@ _cx_memb(_lower_bound)(const _cx_self* self, _cx_raw raw) {
 
 STC_INLINE void
 _cx_memb(_sort_range)(_cx_iter i1, _cx_iter i2, int(*cmp)(const _cx_value*, const _cx_value*)) {
-    qsort(i1.ref, (i2.ref ? i2.ref : i2.end) - i1.ref, sizeof(_cx_value),
+    qsort(i1.ref, it2_ref_(i1, i2) - i1.ref, sizeof(_cx_value),
           (int(*)(const void*, const void*)) cmp);
 }
 
@@ -404,7 +405,7 @@ _cx_memb(_emplace_range)(_cx_self* self, _cx_value* pos,
 #if !c_option(c_no_cmp)
 STC_DEF _cx_iter
 _cx_memb(_find_in)(_cx_iter i1, _cx_iter i2, _cx_raw raw) {
-    const _cx_value* p2 = i2.ref ? i2.ref : i2.end;
+    const _cx_value* p2 = it2_ref_(i1, i2);
     for (; i1.ref != p2; ++i1.ref) {
         const _cx_raw r = i_keyto(i1.ref);
         if (i_eq((&raw), (&r)))
@@ -416,7 +417,7 @@ _cx_memb(_find_in)(_cx_iter i1, _cx_iter i2, _cx_raw raw) {
 STC_DEF _cx_iter
 _cx_memb(_binary_search_in)(_cx_iter i1, _cx_iter i2, const _cx_raw raw,
                             _cx_iter* lower_bound) {
-    const _cx_value* p2 = i2.ref ? i2.ref : i2.end;
+    const _cx_value* p2 = it2_ref_(i1, i2);
     _cx_iter mid = i1;
     while (i1.ref != p2) {
         mid.ref = i1.ref + (p2 - i1.ref)/2;