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SDL_stdinc.h: Add an SDL_clamp() function 

Add a function to clamp a value to a range.

SDL_clamp(x, a, b) is equivalent to SDL_min(a, SDL_max(x, b)): it
ensures that x is not smaller than a, nor larger than b.

While, as best I can tell, this isn't actually standardised anywhere,
it's a very useful function/macro to have.
This commit is contained in:
David Gow 2021-08-13 21:43:00 +08:00 committed by Sam Lantinga
parent 07a2d71e90
commit 35c1bbfa49
1 changed files with 1 additions and 0 deletions
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include/SDL_stdinc.h
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@ -444,6 +444,7 @@ extern DECLSPEC int SDLCALL SDL_abs(int x);
/* NOTE: these double-evaluate their arguments, so you should never have side effects in the parameters */ /* NOTE: these double-evaluate their arguments, so you should never have side effects in the parameters */
#define SDL_min(x, y) (((x) < (y)) ? (x) : (y)) #define SDL_min(x, y) (((x) < (y)) ? (x) : (y))
#define SDL_max(x, y) (((x) > (y)) ? (x) : (y)) #define SDL_max(x, y) (((x) > (y)) ? (x) : (y))
#define SDL_clamp(x, a, b) ((x) < (a)) ? (a) : (((x) > (b)) ? (b) : (x))
extern DECLSPEC int SDLCALL SDL_isalpha(int x); extern DECLSPEC int SDLCALL SDL_isalpha(int x);
extern DECLSPEC int SDLCALL SDL_isalnum(int x); extern DECLSPEC int SDLCALL SDL_isalnum(int x);