I'm trying to compose as a test, where i fill a precompiled list of numbers in an array. What step am i missing to make this part work? (I i'm using gdc). it keeps complaining of a non-constant expression. Is there any way to make this work?

bool []primes = tp(1000);

bool [] tp( int max )
{
	bool[] tmp = new bool[](max);

	for ( int cnt = 2; cnt < max; cnt++ )
		tmp[cnt] = isprime( cnt );

	return tmp;
}

bool isprime( int x )
{
	for ( int cnt = 2; cnt < x; cnt++ )
		if ( x % cnt == 0 )
			return false;

	return true;
}

 Era

Era Scarecrow a écrit :
>  I'm trying to compose as a test, where i fill a precompiled list of numbers in an array. What step am i missing to make this part work? (I i'm using gdc). it keeps complaining of a non-constant expression. Is there any way to make this work?
> 
> bool []primes = tp(1000);
> 
> bool [] tp( int max )
> {
> 	bool[] tmp = new bool[](max);
> 
> 	for ( int cnt = 2; cnt < max; cnt++ )
> 		tmp[cnt] = isprime( cnt );
> 
> 	return tmp;
> }
> 
> bool isprime( int x )
> {
> 	for ( int cnt = 2; cnt < x; cnt++ )
> 		if ( x % cnt == 0 )
> 			return false;
> 
> 	return true;
> }
> 
>  Era

lol,

Some days ago I was writing the same thing to make a video showing Descent hovering over that constant and the primes would appear.

It seems this can't be interpreted:

new bool[](max);

You can't create anything on the heap when doing CTFE (afaik). I did it by using a dynamic array:

bool[] tmp;
tmp ~= false;
tmp ~= false;
for ( int cnt = 2; cnt < max; cnt++ )
  tmp ~= isprime( cnt );

And since CTFE seems to not have garbage collection, you might want to do "cnt * cnt <= x" instead of "cnt < x" ;-)

"Era Scarecrow" <rtcvb32@yahoo.com> wrote in message news:g664l0$2bia$1@digitalmars.com...
>
> I'm trying to compose as a test, where i fill a precompiled list of numbers in an array. What step am i missing to make this part work? (I i'm using gdc). it keeps complaining of a non-constant expression. Is there any way to make this work?
>
> bool []primes = tp(1000);

Completely off-topic, but a stylistic point.  Putting the brackets next to the name is a bit misleading in D, since unlike in C, type decorators do not attach to the variables but instead to the base type.  That is,

char * x, y;

in C means that x is a pointer to a char, while y is a char; but in D, they're both char*.  For that reason it's recommended that the brackets/asterisks attach to the type.

(I still can't quite figure out why you also use "bool [] tp" and "bool[] tmp".  Usually people are consistent about these things ;) )