On Sunday, 4 October 2015 at 18:24:08 UTC, John Colvin wrote:
On Sunday, 4 October 2015 at 18:08:55 UTC, Laeeth Isharc wrote:
On Sunday, 4 October 2015 at 17:17:14 UTC, Laeeth Isharc wrote:
On Sunday, 4 October 2015 at 16:37:34 UTC, John Colvin wrote:
On Sunday, 4 October 2015 at 15:45:55 UTC, Laeeth Isharc
wrote:
How do I persuade partial to tie itself to the appropriate
overload?
---
As far as I can see std.functional.partial only does one
argument at a time.
bars=partial!(partial!(partial!(slurpBars!BarType,
filename), startDate), endDate);
or maybe, I'm not sure, but maybe you can do:
bars=partial!(slurpBars!BarType, AliasSeq!(filename,
startDate, endDate));
If you find you really need to manually mess with overloads,
use http://dlang.org/traits.html#getOverloads. You may have
to wrap it in AliasSeq in some situations due to
grammar/parser constraints.
fwiw - still doesn't work (whether I use alias or auto,
trying each of your solutions). I'll look at getOverloads.
How do I distinguish between two overloads that return the
same type but have different arguments? It looks like
getOverloads only deals with cases where the return type is
different, judging by the docs.
getOverloads should give you all the overloads of a function,
whether they return the same or different types. The example
in the docs just happens to have different types.
In general, return types are not considered when talking about
overloads. For example, two functions that take the same
arguments but have different return types are not overloaded,
they are in conflict.
Thanks for this. The only problem then is how to manipulate what
getOverloads returns. (No need to do this now as it's not worth
it - I just wanted to try using partial if it wasn't too much
work. easier just to make an alternate declaration with the type
in its name).
Is this not a bug in the implementation of partial?
import std.functional;
import std.stdio;
void bish(T)(string arg, string barg)
{
writefln("bishs: %s, %s",arg,barg,to!T);
}
void bish(T)(int argi, string barg)
{
writefln("bishi: %s, %s",argi,barg.to!T);
}
void main(string[] args)
{
alias b=partial!(bish!string,"hello"); // this line does not
compile
alias c=partial!(b,"therex");
b("there");
c();
}
[laeeth@engine marketdata]$ dmd partial.d
partial.d(15): Error: template partial.bish matches more than one
template declaration:
partial.d(4): bish(T)(string arg, string barg)
and
partial.d(8): bish(T)(int argi, string barg)
partial knows which overload to call - I told it!
it works fine without templated arguments. so the following
works fine:
import std.functional;
import std.stdio;
void bish(string arg, string barg)
{
writefln("bishs: %s, %s",arg,barg);
}
void bish(int argi, string barg)
{
writefln("bishi: %s, %s",argi,barg);
}
void main(string[] args)
{
alias b=partial!(bish,"hello");
alias c=partial!(b,"therex");
b("there");
c();
}