• BCS <BCS_member pathlink.com> May 20 2006
• "Jarrett Billingsley" <kb3ctd2 yahoo.com> May 20 2006
• Don Clugston <dac nospam.com.au> May 22 2006
• BCS <BCS_member pathlink.com> May 23 2006
• Daniel Keep <daniel.keep.lists gmail.com> May 23 2006
• Daniel Keep <daniel.keep.lists gmail.com> May 23 2006

BCS <BCS_member pathlink.com> writes:

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!();
}

"Jarrett Billingsley" <kb3ctd2 yahoo.com> writes:

"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! 

Don Clugston <dac nospam.com.au> writes:

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.

BCS <BCS_member pathlink.com> writes:

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"));

Daniel Keep <daniel.keep.lists gmail.com> writes:

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 <daniel.keep.lists gmail.com> writes:

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/