Thread: BitFlags unsigned int

  1. #1
    Registered User
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    Jan 2007
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    BitFlags unsigned int

    I have the following bitflags

    Code:
    #define LEFT  (1<<0)
    #define RIGHT (1<<1)
    #define UP    (1<<2)
    #define DOWN  (1<<3)
    but I only assign them to unsigned int's

    is it better to use

    Code:
    #define LEFT  (1U<<0)
    #define RIGHT (1U<<1)
    #define UP    (1U<<2)
    #define DOWN  (1U<<3)
    or it doesnt matter??

  2. #2
    and the Hat of Guessing tabstop's Avatar
    Join Date
    Nov 2007
    Posts
    14,185
    Since int is guaranteed to be larger than four bits, I can't see that it matters. (int and unsigned int have to be the same size, and the conversion is transparent--i.e., it doesn't change the bit pattern unless you're not on a twos complement machine--so I don't think there's any extra work involved.)

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