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-rw-r--r--kit/move_back.h49
1 files changed, 49 insertions, 0 deletions
diff --git a/kit/move_back.h b/kit/move_back.h
new file mode 100644
index 0000000..1885f5d
--- /dev/null
+++ b/kit/move_back.h
@@ -0,0 +1,49 @@
+#ifndef KIT_MOVE_BACK_H
+#define KIT_MOVE_BACK_H
+
+#include "types.h"
+
+#include <string.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define KIT_MOVE_BACK_INL(new_size, array, ...) \
+ do { \
+ i64 index_; \
+ i64 end_ = (array).size; \
+ u8 temp_[sizeof *(array).values]; \
+ for (index_ = 0; index_ < end_;) { \
+ if (__VA_ARGS__) { \
+ end_--; \
+ if (index_ != end_) { \
+ memcpy(temp_, (array).values + end_, \
+ sizeof *(array).values); \
+ (array).values[end_] = (array).values[index_]; \
+ memcpy((array).values + index_, temp_, \
+ sizeof *(array).values); \
+ } \
+ } else \
+ index_++; \
+ } \
+ (new_size) = end_; \
+ } while (0)
+
+#define KIT_MOVE_BACK(new_size, array, value, cond) \
+ KIT_MOVE_BACK_INL(new_size, array, \
+ (cond) ((array).values[index_], (value)))
+
+#define KIT_MOVE_BACK_REF(new_size, array, value, cond) \
+ KIT_MOVE_BACK_INL(new_size, array, \
+ (cond) ((array).values + index_, (value)))
+
+#ifdef __cplusplus
+}
+#endif
+
+#define MOVE_BACK_INL KIT_MOVE_BACK_INL
+#define MOVE_BACK KIT_MOVE_BACK
+#define MOVE_BACK_REF KIT_MOVE_BACK_REF
+
+#endif