appr

1 files changed, 6 insertions, 0 deletions

diff --git a/_.h b/_.h
index 5ea9f60..4e8eb40 100644
--- a/_.h
+++ b/_.h
@@ -55,6 +55,12 @@ void *_realloc(void *ptr, size_t size);
 	const auto ___y = (Y); \
 	(___x < ___y) ? ___x : ___y; \
 })
+#define appr(X, Y, S) ({ \
+	const auto __x_ = (X); \
+	const auto __y_ = (Y); \
+	const auto __s_ = (S); \
+	(__x_ > __y_) ? max(__x_ - __s_, __y_) : min(__x_ + __s_, __y_); \
+})
 
 #define STR(X) #X
 #define defer(X) if (atexit(X)) { X(); panic("defer"); }