Jared Updike wrote:
http://www.haskell.org/onlinereport/decls.html#default-decls
http://www.haskell.org/tutorial/numbers.html#sect10.4
I still don't see, why it works for show but not for my_show.
On 1/12/06, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote:
[...]
class (Show a) = My_show a where
On Thu, 12 Jan 2006 [EMAIL PROTECTED] wrote:
What does the Haskell type system do with expressions such as these . . .
?
show 1
show (1+2)
The type of the subexpressions 1 and 1+2 are ambiguous since they
have type (Num a) = a. I'm under the assumption before 1+2 is
evaluated, the 1 and
Am Freitag, 13. Januar 2006 01:31 schrieb Cale Gibbard:
On 12/01/06, Marc Weber [EMAIL PROTECTED] wrote:
I think one simple example like ((+1).(\x-x**2)) in continuation style
would make me understand a lot more..
Marc
The basic idea about the continuation monad is that the entire
Am Freitag, 13. Januar 2006 11:12 schrieb Christian Maeder:
Jared Updike wrote:
http://www.haskell.org/onlinereport/decls.html#default-decls
http://www.haskell.org/tutorial/numbers.html#sect10.4
I still don't see, why it works for show but not for my_show.
Says the report:
Ambiguities in
On 13/01/06, Daniel Fischer [EMAIL PROTECTED] wrote:
Am Freitag, 13. Januar 2006 11:12 schrieb Christian Maeder:
Jared Updike wrote:
http://www.haskell.org/onlinereport/decls.html#default-decls
http://www.haskell.org/tutorial/numbers.html#sect10.4
I still don't see, why it works for
Cale Gibbard wrote:
Snip
So long as we're going to have a defaulting mechanism, it seems a bit
odd to restrict it to Num, and to classes in the Prelude.
Instead of having literals such as 1 that could be Int, Integer, or Float
etc, why not just have one Number type declared as something
On 13/01/06, Brian Hulley [EMAIL PROTECTED] wrote:
Cale Gibbard wrote:
Snip
So long as we're going to have a defaulting mechanism, it seems a bit
odd to restrict it to Num, and to classes in the Prelude.
Instead of having literals such as 1 that could be Int, Integer, or Float
etc, why
Christian Maeder wrote:
Jared Updike wrote:
http://www.haskell.org/onlinereport/decls.html#default-decls
http://www.haskell.org/tutorial/numbers.html#sect10.4
I still don't see, why it works for show but not for my_show.
On 1/12/06, [EMAIL PROTECTED] [EMAIL PROTECTED]
wrote:
[...]
Hello,
I'd like to put forth two situations in which I miss the ability to use
inheritance in Haskell, and then see if maybe somebody has some insight
that I'm missing out on.
Situation #1: In HDBC, there is a Connection type that is more or less
equivolent to a class on a OOP language. In
Hi,
I'm trying to split a string into a list of substrings, where substrings
are delimited by blank lines.
This feels like it *should* be a primitive operation, but I can't seem
to find one that works. It's neither a fold nor a partition, since each
chunk is separated by a 2-character sequence.
On 13/01/06, John Goerzen [EMAIL PROTECTED] wrote:
Hello,
I'd like to put forth two situations in which I miss the ability to use
inheritance in Haskell, and then see if maybe somebody has some insight
that I'm missing out on.
Situation #1: In HDBC, there is a Connection type that is more
On 1/13/06, Adam Turoff [EMAIL PROTECTED] wrote:
Hi,
I'm trying to split a string into a list of substrings, where substrings
are delimited by blank lines.
This feels like it *should* be a primitive operation, but I can't seem
to find one that works. It's neither a fold nor a partition,
On 1/13/06, Sebastian Sylvan [EMAIL PROTECTED] wrote:
On 1/13/06, Adam Turoff [EMAIL PROTECTED] wrote:
Hi,
I'm trying to split a string into a list of substrings, where substrings
are delimited by blank lines.
This feels like it *should* be a primitive operation, but I can't seem
to
That works except it loses single newline characters.
let s = 1234\n5678\n\nabcdefghijklmnopq\n\n,,.,.,.
Prelude blocks s
[12345678,abcdefghijklmnopq,,,.,.,.]
Jared.
On 1/13/06, Sebastian Sylvan [EMAIL PROTECTED] wrote:
On 1/13/06, Sebastian Sylvan [EMAIL PROTECTED] wrote:
On 1/13/06, Adam
On 2006-01-13 at 13:32PST Jared Updike wrote:
That works except it loses single newline characters.
let s = 1234\n5678\n\nabcdefghijklmnopq\n\n,,.,.,.
Prelude blocks s
[12345678,abcdefghijklmnopq,,,.,.,.]
Also the argument to groupBy ought to be some sort of
equivalence relation.
blocks =
On Jan 13, 2006, at 4:35 PM, Jon Fairbairn wrote:
On 2006-01-13 at 13:32PST Jared Updike wrote:
That works except it loses single newline characters.
let s = 1234\n5678\n\nabcdefghijklmnopq\n\n,,.,.,.
Prelude blocks s
[12345678,abcdefghijklmnopq,,,.,.,.]
Also the argument to groupBy ought
On 1/13/06, Sebastian Sylvan [EMAIL PROTECTED] wrote:
blocks = map concat . groupBy (const (not . null)) . lines
Thanks. That's a little more involved than I was looking for, but that
certainly looks better than pattern matching on ('\n':'\n':rest). ;-)
For the record, lines removes the
I have HDBC running with Sqlite3, but I'm getting a SqlError due to a
locked table. Please excuse my SQL ignorance, but what may be causing
the problem? In SQL, are we not allowed to select, update, and delete
from a table within a single transaction? If not, what are the rules
for
Daniel Fischer wrote:
Now the question is, could that restriction be lifted, i.e., would it be
possible/worthwhile to let defaulting also take place if user defined classes
are involved?
The current defaulting mechanism in Haskell is very, very conservative.
You could easily relax the
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