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(This is the documentation for SDL3, which is under heavy development and the API is changing! SDL2 is the current stable version!)


Determine if a unsigned 32-bit value has exactly one bit set.

Header File

Defined in <SDL3/SDL_bits.h>


SDL_FORCE_INLINE SDL_bool SDL_HasExactlyOneBitSet32(Uint32 x);

Function Parameters

Uint32 x the 32-bit value to examine.

Return Value

(SDL_bool) Returns SDL_TRUE if exactly one bit is set in x, SDL_FALSE otherwise.


If there are no bits set (x is zero), or more than one bit set, this returns SDL_FALSE. If any one bit is exclusively set, this returns SDL_TRUE.

Note that this is a forced-inline function in a header, and not a public API function available in the SDL library (which is to say, the code is embedded in the calling program and the linker and dynamic loader will not be able to find this function inside SDL itself).

Thread Safety

It is safe to call this function from any thread.


This function is available since SDL 3.0.0.

CategoryAPI, CategoryAPIFunction, CategoryBits

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