Thanks for you answer . I have the idea to see in the SDL port (I work
on the SDL2 port) which is finished and has the same problems. They
solve the problem like this :
pub fn unfold_bits(bitflags: u32) -> ~[SDL_WindowFlags] {
let flags = [SDL_WINDOW_FULLSCREEN,
SDL_WINDOW_OPENGL,
SDL_WINDOW_SHOWN,
SDL_WINDOW_HIDDEN,
SDL_WINDOW_BORDERLESS,
SDL_WINDOW_RESIZABLE,
SDL_WINDOW_MINIMIZED,
SDL_WINDOW_MAXIMIZED,
SDL_WINDOW_INPUT_GRABBED,
SDL_WINDOW_INPUT_FOCUS,
SDL_WINDOW_MOUSE_FOCUS,
SDL_WINDOW_FULLSCREEN_DESKTOP,
SDL_WINDOW_FOREIGN
];
flags.iter().filter_map(|&flag| {
if bitflags & (flag as u32) != 0 { Some(flag) }
else { None }
}).collect()
}
Philippe
Le 15/01/2014 17:36, SiegeLord a écrit :
On 01/15/2014 11:29 AM, Nicolas Silva wrote:
I think enums are not a good fit for bitwise operations, it's not really
meant for that.
I came to the same conclusion and came up with a nice macro to
automate that, seen here:
https://github.com/SiegeLord/RustAllegro/blob/master/src/rust_util.rs#L3..L56
and used here
https://github.com/SiegeLord/RustAllegro/blob/master/src/allegro/internal/bitmap_like.rs#L9..L23
.
This enables a nice, C-like API when composing/extracting flags via
the bit-or and bit-and operators.
-SL
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