Two questions:

This is supposed to make a list of all numbers from 0 to i, can it be made to work, and if so how?

template list(int i)
{
static if(i==0)
int[] list = [0];
else
int[] list = list!(i-1) ~ i;
}

Should this hang or should the static assert kill it before it loops? (as of
0.157, it hangs)

template hang()
{
static assert(false);
const int hang = hang!();
}

"BCS" <BCS_member@pathlink.com> wrote in message news:e4oca5$8pj$1@digitaldaemon.com...

> This is supposed to make a list of all numbers from 0 to i, can it be made
> to
> work, and if so how?
>
> template list(int i)
> {
> static if(i==0)
> int[] list = [0];
> else
> int[] list = list!(i-1) ~ i;
> }

This seems to be a problem in D.  I say this because Don Clugston, who knows more about templates than anyone I've ever met, does the following:

http://svn.dsource.org/projects/ddl/trunk/meta/generatetable.d http://svn.dsource.org/projects/ddl/trunk/meta/hack/hackgenerate.d

He just uses a templated "generator" function instead of a fixed function to create the array, but the point is that you'll notice he uses that hack, which generates the array by brute force - by just creating the elements statically!

BCS wrote:
> Two questions:
> 
> This is supposed to make a list of all numbers from 0 to i, can it be made to
> work, and if so how?

It doesn't work because D doesn't have array literals yet.
(But since D *does* have char[] and dchar[] literals, you can do some nasty casts to get the effect you want).

> template list(int i)
> {
> static if(i==0)
> int[] list = [0];
> else
> int[] list = list!(i-1) ~ i;	
> }
> 
> Should this hang or should the static assert kill it before it loops? (as of
> 0.157, it hangs)
> 
> template hang()
> {
> static assert(false);
> const int hang = hang!();
> }

The file below doesn't hang for me in DMD 0.156 Windows, it gives a sensible error message:
-----
template hang()
{
	static assert(0);
	const int hang = hang!();
}

const int x = hang!();
-----
If that it fails for you, enter it in Bugzilla as a regression or Linux-only bug.

In article <e4ub7s$2v7l$1@digitaldaemon.com>, Don Clugston says...
>
>BCS wrote:
>> Two questions:
[...]
>
>It doesn't work because D doesn't have array literals yet.

???

this works (I was using it tonight):

struct fo {int i}
fo[] bar = [ {i:5}, {i:6} ];

--------------------------
>> template hang()
>> {
>> static assert(false);
>> const int hang = hang!();
>> }
[...]
>-----
>If that it fails for you, enter it in Bugzilla as a regression or Linux-only bug.
>

@#$%@ faulty memory (the gray wet stuff, not the silicon suff). Try:

template hang(int i)
{
static assert(0);
const int hang = hang!(i-1);
}

const int x = hang!(1);

this hangs 0.157 on Linux and XP (now bug #152)


OK, next question: has anyone done a sort?

static assert("abc" == sort!("bca"));

BCS wrote:
> In article <e4ub7s$2v7l$1@digitaldaemon.com>, Don Clugston says...
>> BCS wrote:
>>> Two questions:
> [...]
>> It doesn't work because D doesn't have array literals yet.
> 
> ???
> 
> this works (I was using it tonight):
> 
> struct fo {int i}
> fo[] bar = [ {i:5}, {i:6} ];
> 
> --------------------------
>>> template hang()
>>> {
>>> static assert(false);
>>> const int hang = hang!();
>>> }
> [...]
>> -----
>> If that it fails for you, enter it in Bugzilla as a regression or Linux-only bug.
>>
> 
> @#$%@ faulty memory (the gray wet stuff, not the silicon suff). Try:
> 
> template hang(int i)
> {
> static assert(0);
> const int hang = hang!(i-1);
> }
> 
> const int x = hang!(1);
> 
> this hangs 0.157 on Linux and XP (now bug #152)
> 
> 
> OK, next question: has anyone done a sort?
> 
> static assert("abc" == sort!("bca"));
> 

Here you go:

#
# template insertChar(char[] chr, char[] str)
# {
#     static if( str.length == 0 )
#         const char[] insertChar = chr;
#     else static if( chr[0] <= str[0] )
#         const char[] insertChar = chr ~ str;
#     else
#         const char[] insertChar = str[0..1] ~ insertChar!(chr, #
str[1..$]);
# }
#
# template sort(char[] str)
# {
#     static if( str.length == 0 )
#         const char[] sort = "";
#     else
#         const char[] sort = insertChar!(str[0..1], sort!(str[1..$]));
# }
#
# template slice(char[] str)
# {
#     const char[] slice = str[1..$-1];
# }
#
# pragma(msg, `sort!("bsakdjfyiu4r") == ` ~ sort!("bsakdjfyiu4r"));
#
# void
# main()
# {
# }
#

Tested it just then :)

	-- Daniel Keep

-- 

v1sw5+8Yhw5ln4+5pr6OFma8u6+7Lw4Tm6+7l6+7D a2Xs3MSr2e4/6+7t4TNSMb6HTOp5en5g6RAHCP    http://hackerkey.com/

Daniel Keep wrote:
> 
> [snip]
> #     else static if( chr[0] <= str[0] )
> #         const char[] insertChar = chr ~ str;
> #     else
> #         const char[] insertChar = str[0..1] ~ insertChar!(chr, #
> str[1..$]);

Oops, stupid mail program.  That should be

# const char[] insertChar = str[0..1] ~ insertChar!(chr, str[1..$]);

Also, you could easily generalise this by changing 'char' to whatever type you want to use.  That is left as an exercise for the reader :P

	-- Daniel

-- 

v1sw5+8Yhw5ln4+5pr6OFma8u6+7Lw4Tm6+7l6+7D a2Xs3MSr2e4/6+7t4TNSMb6HTOp5en5g6RAHCP    http://hackerkey.com/