Doc: Noted that macro parameters in chartype.h are allowed to have side-effects.

diff --git a/ucw/chartype.h b/ucw/chartype.h
index f9c80522cf8c4ba0f6aed3fd1a7be52889cb5bee..055b540ac9168ea6f8be1b1bd1a12eb17bebf8f2 100644 (file)
--- a/ucw/chartype.h
+++ b/ucw/chartype.h
@@ -15,7 +15,8 @@
  * This way we bypass most possible problems with different compilation environments.
  *
  * All functions and macros accept any numbers and if it is necessary, they simply ignore higher bits.
- * It does not matter whether a parameter is signed or unsigned.
+ * It does not matter whether a parameter is signed or unsigned. Parameters are evaluated exactly once,
+ * so they can have side-effects.
  ***/
 
 #define _C_UPPER 1                     /* Upper-case letters */