Question about version ( ) keyword

[Kagamin via Digitalmars-d]

On Monday, 21 March 2016 at 14:51:48 UTC, Vincent R wrote:
> When I see this code I cannot help thinking of something like:
>
> version( CRuntime_Glibc ) || version( FreeBSD ) || version 
> (Solaris)
> {
>     if(version(Solaris))
> 	   enum PTHREAD_BARRIER_SERIAL_THREAD = -2;
> 	else
> 	   enum PTHREAD_BARRIER_SERIAL_THREAD = -1;
> 	
>     int pthread_barrier_destroy(pthread_barrier_t*);
>     int pthread_barrier_init(pthread_barrier_t*, in 
> pthread_barrierattr_t*, uint);
>     int pthread_barrier_wait(pthread_barrier_t*);
>     int pthread_barrierattr_destroy(pthread_barrierattr_t*);
>     int pthread_barrierattr_getpshared(in 
> pthread_barrierattr_t*, int*);
>     int pthread_barrierattr_init(pthread_barrierattr_t*);
>     int pthread_barrierattr_setpshared(pthread_barrierattr_t*, 
> int);
> }
> else version (OSX) ||version (CRuntime_Bionic)
> {
> }
> else
> {
>     static assert(false, "Unsupported platform");
> }

Even shorter:

version(Solaris)
    enum PTHREAD_BARRIER_SERIAL_THREAD = -2;
else
    enum PTHREAD_BARRIER_SERIAL_THREAD = -1;
	
int pthread_barrier_destroy(pthread_barrier_t*);
int pthread_barrier_init(pthread_barrier_t*, in 
pthread_barrierattr_t*, uint);
int pthread_barrier_wait(pthread_barrier_t*);
int pthread_barrierattr_destroy(pthread_barrierattr_t*);
int pthread_barrierattr_getpshared(in pthread_barrierattr_t*, 
int*);
int pthread_barrierattr_init(pthread_barrierattr_t*);
int pthread_barrierattr_setpshared(pthread_barrierattr_t*, int);