opDispatch(string name, E...) (E e) question.
How do I call opDispatch(string name, E...)(E elements) ?
What I want to archive is to call f.i. fm.list with an arbitrary number
of arguments without using
fm.list(1, abc, 4L, 3.33);
Instead I would prefer
fm.list = (1, abc, 4L, 3.33);
Is this somehow possible ?
import std.variant;
import std.conv;
auto fm = FlexMap();
fm.ten = 10;
fm.ten = [Ten, Zehn, Tein];
fm.list = [20, 10, 2, 2, 44 ] ;
fm.list = Hello opDispatch;
struct FlexMap
{
Variant[] [string] map;
Variant[] opDispatch(string name)()
{
return map[name];
}
Variant[] opDispatch(string name, E...)(E elements)
{
foreach(element; elements)
map[name] ~= to!Variant(element);
return map[name];
}
Variant[] opDispatch(string name, T) (T t)
{
map[name] ~= to!Variant(t);
return map[name];
}
}
Another question :
How do I bring in :
opDispatch(string name, T) (T[] t)
into FlexMap ?
TIA, Bjoern
Re: opDispatch(string name, E...) (E e) question.
On 26 March 2012 09:45, bls bizp...@orange.fr wrote: How do I call opDispatch(string name, E...)(E elements) ? What I want to archive is to call f.i. fm.list with an arbitrary number of arguments without using fm.list(1, abc, 4L, 3.33); Instead I would prefer fm.list = (1, abc, 4L, 3.33); You can use @property on opDispatch to use setter/getter notation, however I wouldn't rely on that functionality long-term if you want to keep the same function-call syntax (since -property flag is supposed to enforce proper parenthesis use on `@property`s). fm.list = (1, abc, 4L, 3.33); I'm hoping you mean `fm.list = [1, abc, 4L, 3.33];` I think that using the right template parameters, you can use the same code for (T...)(T el) and (T)(T[]), I just can't remember what that is... Another question : How do I bring in : opDispatch(string name, T) (T[] t) -- James Miller
Re: opDispatch(string name, E...) (E e) question.
On 03/25/2012 02:04 PM, James Miller wrote:
On 26 March 2012 09:45, blsbizp...@orange.fr wrote:
How do I call opDispatch(string name, E...)(E elements) ?
What I want to archive is to call f.i. fm.list with an arbitrary number of
arguments without using
fm.list(1, abc, 4L, 3.33);
Instead I would prefer
fm.list = (1, abc, 4L, 3.33);
You can use @property on opDispatch to use setter/getter notation,
however I wouldn't rely on that functionality long-term if you want to
keep the same function-call syntax (since -property flag is supposed
to enforce proper parenthesis use on `@property`s).
fm.list = (1, abc, 4L, 3.33);
I'm hoping you mean `fm.list = [1, abc, 4L, 3.33];` I think that
using the right template parameters, you can use the same code for
(T...)(T el) and (T)(T[]), I just can't remember what that is...
Ouch, yep, I mean [1, abc, 4L, 3.33]
But I have no clue how to implement it.
Another question :
How do I bring in :
opDispatch(string name, T) (T[] t)
--
James Miller
(T) (T[] t) AND (T) (T t) seems not to work.
snip
struct FlexMap
{
Variant[] [string] map;
Variant[] opDispatch(string name)()
{
return map[name];
}
Variant[] opDispatch(string name, E...)(E elements)
{
foreach(element; elements)
map[name] ~= to!Variant(element);
return properties[name];
}
Variant[] opDispatch(string name, T) (T t)
{
map[name] ~= to!Variant(t);
return map[name];
}
// No go
Variant[] opDispatch(string name, T) (T[] t) {}
}
Re: opDispatch(string name, E...) (E e) question.
On 26 March 2012 10:34, bls bizp...@orange.fr wrote:
(T) (T[] t) AND (T) (T t) seems not to work.
Ok, so looking here: http://dlang.org/function.html, I have determined
that, if you are using Variant arrays (though I'm not sure if you can
do that using literals...) you can use the syntax from this example:
int test() {
return sum(1, 2, 3) + sum(); // returns 6+0
}
int func() {
int[3] ii = [4, 5, 6];
return sum(ii); // returns 15
}
int sum(int[] ar ...) {
int s;
foreach (int x; ar)
s += x;
return s;
}
You'll probably need to do some experimentation to figure out how
Variant fits into that properly, but it shouldn't be too hard.
Also, remember that opDispatch takes the name of the function as the
last parameter, so watch out for that.
--
James Miller
Re: opDispatch(string name, E...) (E e) question.
On 03/25/2012 02:59 PM, James Miller wrote: Ok, so looking here:http://dlang.org/function.html, I have determined that, if you are using Variant arrays (though I'm not sure if you can do that using literals...) you can use the syntax from this example: Thanks James.. will give it tomorrow a new try. At least Variant[] va = [1, 2.3222, abc]; is not working. Guess I have to give up the opDispatch() thing and create it a bit more traditional :) Bjoern oh, beside you mean : opDispatch(string name, T) (T[] t...)
Re: opDispatch(string name, E...) (E e) question.
On 03/25/12 22:45, bls wrote:
How do I call opDispatch(string name, E...)(E elements) ?
What I want to archive is to call f.i. fm.list with an arbitrary number of
arguments without using
fm.list(1, abc, 4L, 3.33);
Instead I would prefer
fm.list = (1, abc, 4L, 3.33);
Is this somehow possible ?
Well, you can do
template ID(A...) { alias A ID; }
fm.list = ID!(1, abc, 4L, 3.33);
but is that any better than your first version above?...
artur
Re: opDispatch(string name, E...) (E e) question.
Thanks Artur,
On 03/25/2012 03:18 PM, Artur Skawina wrote:
On 03/25/12 22:45, bls wrote:
How do I call opDispatch(string name, E...)(E elements) ?
What I want to archive is to call f.i. fm.list with an arbitrary number of
arguments without using
fm.list(1, abc, 4L, 3.33);
Instead I would prefer
fm.list = (1, abc, 4L, 3.33);
Is this somehow possible ?
Well, you can do
template ID(A...) { alias A ID; }
fm.list = ID!(1, abc, 4L, 3.33);
but is that any better than your first version above?...
Not sure...
Maybe if we rename it
fm.list = Values!(1,2,true);
But I does not work.. Seems I am not able to figure out the opDispatch
signature.
Think I will rewrite it without using opDispatch.
artur
Re: opDispatch(string name, E...) (E e) question.
On Sun, 25 Mar 2012 22:45:57 +0200, bls bizp...@orange.fr wrote:
How do I call opDispatch(string name, E...)(E elements) ?
What I want to archive is to call f.i. fm.list with an arbitrary number
of arguments without using
fm.list(1, abc, 4L, 3.33);
Instead I would prefer
fm.list = (1, abc, 4L, 3.33);
Is this somehow possible ?
No. However, this is:
fm.list = tuple( 1, abc, 4L, 3.33 );
In that case, you probably want to use the overload
opDispatch(string name, E...)(Tuple!E elements)
and mark the other:
opDispatch(string name, E...)(E element) if ( !(E.length == 1
isTuple!(E[0])))
tuple, Tuple, and isTuple are found in std.typecons.
import std.variant;
import std.conv;
auto fm = FlexMap();
fm.ten = 10;
fm.ten = [Ten, Zehn, Tein];
fm.list = [20, 10, 2, 2, 44 ] ;
fm.list = Hello opDispatch;
struct FlexMap
{
Variant[] [string] map;
Variant[] opDispatch(string name)()
{
return map[name];
}
Variant[] opDispatch(string name, E...)(E elements)
{
foreach(element; elements)
map[name] ~= to!Variant(element);
return map[name];
}
Variant[] opDispatch(string name, T) (T t)
{
map[name] ~= to!Variant(t);
return map[name];
}
}
Another question :
How do I bring in :
opDispatch(string name, T) (T[] t)
into FlexMap ?
It's possible to do with template constraints:
import std.traits : isArray;
void opDispatch(string name, T)(T t) if ( isArray!T )
{
// Array specific.
}
void opDispatch(string name, T)(T t) if ( !isArray!T)
{
// Single element.
}
One could also use static if:
Variant[] opDispatch(string name, T)(T t)
{
static if ( is( T U : U[] ) )
{
map[name] ~= to!
}
else
{
// Whatever you want to do differently here.
}
}
Re: opDispatch(string name, E...) (E e) question.
On 03/26/12 00:58, bls wrote:
Thanks Artur,
On 03/25/2012 03:18 PM, Artur Skawina wrote:
On 03/25/12 22:45, bls wrote:
How do I call opDispatch(string name, E...)(E elements) ?
What I want to archive is to call f.i. fm.list with an arbitrary number of
arguments without using
fm.list(1, abc, 4L, 3.33);
Instead I would prefer
fm.list = (1, abc, 4L, 3.33);
Is this somehow possible ?
Well, you can do
template ID(A...) { alias A ID; }
fm.list = ID!(1, abc, 4L, 3.33);
but is that any better than your first version above?...
Not sure...
Maybe if we rename it
fm.list = Values!(1,2,true);
But I does not work.. Seems I am not able to figure out the opDispatch
signature.
import std.stdio;
template Values(A...) { alias A Values; }
struct FlexMap {
template opDispatch(string key) {
auto opDispatch(VS...)(VS vs) {
foreach (v; vs)
writefln(%s: (%s)%s;, key, typeof(v).stringof, v);
}
}
}
void main() {
auto fm = FlexMap();
fm.list = Values!(1, abc, 4L, 3.33);
}
artur
