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--- new:bits [2018/02/18 19:00] – created korshun
+++ new:bits [2018/02/19 12:25] – korshun
@@ Line 1: / Line 1: @@
 ====== Bit functions ======
-These functions allow you to work with variables as if they were arrays of bits.
+===== Working with bit arrays =====
-  * ''bool getbit(int a, int i)'' -- returns bit ''a[i]''
+These functions allow you to work with variables as if they were arrays of bits:
-  * ''void setbit(int a, int i)'' -- performs ''a[i] = 1''
-  * ''void clrbit(int a, int i)'' -- performs ''a[i] = 0''
+  * ''bool getbit(int a, int i)'' -- returns bit ''a[i]''.
-  * ''void tglbit(int a, int i)'' -- performs ''a[i] = !a[i]''
+  * ''int setbit(int a, int i)'' -- performs ''a[i] = 1'' and returns the result.
+  * ''int clrbit(int a, int i)'' -- performs ''a[i] = 0'' and returns the result.
+  * ''int tglbit(int a, int i)'' -- performs ''a[i] = !a[i]'' and returns the result.
+===== Unsetting bit flags =====
+''void notflag(int flags, int flag)''
+Bit flags can be applied using ''flags & SOMEFLAG''. But removing them requires a more complicated expression ''!(flags & SOMEFLAG)''.
+''notflag(flags, SOMEFLAG)'' unsets SOMEFLAG, shorthand for ''!(flags & SOMEFLAG)''.

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