29.09.2010, 13:42
Quote:
|
Originally Posted by Tannz0rz
 Check this out: http://www.cplusplus.com/forum/general/1590/
Flags. Study and give the code below a try: *Note: GetBit is only there for ease of understanding, it'd be simpler just to use the comments in the functions rather than what is currently in use. Code:
#include <a_samp>
#define FILTERSCRIPT
GetBit(flag)
{
return (1 << flag);
}
FlagOn(&mask, flag)
{
mask |= flag;
// mask |= (1 << flag);
}
FlagOff(&mask, flag)
{
mask &= (~flag);
// mask &= ~(1 << flag);
}
HasFlag(mask, flag)
{
return (mask & flag);
// return (mask & (1 << flag));
}
public OnFilterScriptInit()
{
new
flags = 0x0,
i;
for(i = 0; i < 31; ++i)
{
FlagOn(flags, GetBit(i));
printf("Bit: %b, Flag Active: %i", GetBit(i), HasFlag(flags, GetBit(i)));
}
for(i = 0; i < 31; ++i)
{
FlagOff(flags, GetBit(i));
printf("Bit: %b, Flag Active: %i", GetBit(i), HasFlag(flags, GetBit(i)));
}
return 0;
}
Code:
#include <a_samp>
#define FILTERSCRIPT
Pack(&mask, byte, value)
{
mask |= ((value & 0xff) << (byte * 8));
}
UnPack(&mask, byte)
{
mask &= ~(PackGet(mask, byte) << (byte * 8));
}
PackGet(mask, byte)
{
return ((mask >> (byte * 8)) & 0xff);
}
public OnFilterScriptInit()
{
new
mask = 0x0,
i;
for(i = 0; i < 4; ++i)
{
Pack(mask, i, random(255));
printf("Byte: %i, Value: %i", i, PackGet(mask, i));
}
for(i = 0; i < 4; ++i)
{
UnPack(mask, i);
printf("Byte: %i, Value: %i", i, PackGet(mask, i));
}
return 0;
}
Enjoy! |
.I mentioned the first method in previous posts, i just never gave physical code (thank you for providing it heh). You could take it a step further and convert your functions into defines, would be faster that way.
I'm not so sure about the second method though. Im all for saving memory, but i dont think the speed difference would be worth it for 4 unsigned 8 bit integers. That's just my view though, there's nothing wrong with it at all. To be honest, i never even thought about this once. Its pretty neat at the very least.