Programming Flags

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  • if enum has "_FLAG" in it's name, it means it's a "flag" enum
  • flags are used to specify multiple options in one variable (most commonly UInt), where each option is assigned to a certain bit
  • having such options like FLAG_1, FLAG_2, FLAG_3 you can do the following: 
  x  = (FLAG_1 | FLAG_2); // assign to x FLAG_1 and FLAG_2 enabled
  x |=  FLAG_3; // enable  FLAG_3
  x ^=  FLAG_3; // toggle  FLAG_3
  x &= ~FLAG_3; // disable FLAG_3
  if(   x&FLAG_3  ); // check if FLAG_3 is  enabled
  if( !(x&FLAG_3) ); // check if FLAG_3 is disabled
  • If you're not familiar with bitwise operations, you can use following functions:
    • FlagTest - check if a flag is enabled
    • FlagEnable - enable a flag
    • FlagDisable - disable a flag
    • FlagToggle - toggle flag
    • FlagSet - set if flag should be enabled or disabled
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