On Monday, 3 February 2014 at 19:47:56 UTC, Dicebot wrote:
On Monday, 3 February 2014 at 19:35:47 UTC, Andre wrote:
Btw. having std.decimal in the library would be really nice;)
Kind regards
André
There is a proposal in Phobos review queue
(http://wiki.dlang.org/Review_Queue) but its author
On Monday, 3 February 2014 at 19:35:47 UTC, Andre wrote:
Btw. having std.decimal in the library would be really nice;)
Kind regards
André
There is a proposal in Phobos review queue
(http://wiki.dlang.org/Review_Queue) but its author does not seem
to be active anymore so it moves nowhere.
Am 03.02.2014 20:09, schrieb Ali Çehreli:
On 02/03/2014 10:15 AM, Andre wrote:
>
> I want to check whether the value stored in
> variant v is a type of Decimal during runtime.
> Is there a nice way?
>
> Kind regards
> André
>
> import std.variant;
>
> struct Decimal(int scale, int prec
On 02/03/2014 10:15 AM, Andre wrote:
>
> I want to check whether the value stored in
> variant v is a type of Decimal during runtime.
> Is there a nice way?
>
> Kind regards
> André
>
> import std.variant;
>
> struct Decimal(int scale, int precision){
> int _precision = precision;
> int
(you can check for specific type via `v.type() ==
typeid(Decimal!(10,2))` though)
No. Variant only stores TypeInfo for its current data and
templated struct will have a totally different type for each set
of template arguments. Their similarity exists only during
compile-time.
Hi,
I want to check whether the value stored in
variant v is a type of Decimal during runtime.
Is there a nice way?
Kind regards
André
import std.variant;
struct Decimal(int scale, int precision){
int _precision = precision;
int _scale = scale;
this(string value){/*...
On Monday, 24 June 2013 at 15:46:05 UTC, Steven Schveighoffer
wrote:
On Sun, 23 Jun 2013 11:29:10 -0400, Lemonfiend
wrote:
On Sunday, 23 June 2013 at 15:15:16 UTC, Jacob Carlborg wrote:
On 2013-06-23 13:26, Lemonfiend wrote:
foreach (I i; array) {
if (B b = cast(B) i) { ... }
}
Thanks a
On Sun, 23 Jun 2013 11:29:10 -0400, Lemonfiend wrote:
On Sunday, 23 June 2013 at 15:15:16 UTC, Jacob Carlborg wrote:
On 2013-06-23 13:26, Lemonfiend wrote:
foreach (I i; array) {
if (B b = cast(B) i) { ... }
}
Thanks all 3 of you for the quick and identical answers. :)
It had not occurr
On 2013-06-23 17:29, Lemonfiend wrote:
Using the .classinfo is what I looked at before asking here.
However, according to the specs:
".classinfo applied to an interface gives the information for the
interface, not the class it might be an instance of."
So the i.classinfo and B.classinfo would be
;
So the i.classinfo and B.classinfo would be different?
You can also hide the cast in a function if you want to be a
bit more clear of the intent:
T instanceOf (T) (Object value)
{
return cast(T) value);
}
if (i.instanceOf!(B)) { }
This is indeed what I did :)
for.
You can also hide the cast in a function if you want to be a bit more
clear of the intent:
T instanceOf (T) (Object value)
{
return cast(T) value);
}
if (i.instanceOf!(B)) { }
--
/Jacob Carlborg
o is an instance of a class B use a
cast"
It does a bit inelegant to me.. Or are casts simply extremely cheap?
Casts are as cheap as testing whether an object is an instance of a
certain class. Having the cast evaluate to a nullable reference is
certainly more elegant than having inst
foreach (I i; array) {
if (B b = cast(B) i) { ... }
}
Thanks all 3 of you for the quick and identical answers. :)
It had not occurred to me to use a cast for this, but indeed the
language ref says the same:
"In order to determine if an object o is an instance of a class B
use a cast"
It
of a specific type (a la instanceOf), and I
can't figure out how to do it.
Could anyone help me out?
[code]
interface I
{
void update();
void write();
}
class A : I
{
int n;
void update()
{
n++;
}
On Sunday, 23 June 2013 at 11:04:59 UTC, Lemonfiend wrote:
...
void writeAll()
{
foreach(elem; array)
elem.write();
}
void writeB()
{
// Only call .write on B's
// How do I get the B's
On 06/23/13 13:04, Lemonfiend wrote:
> void writeAll()
> {
> foreach(elem; array)
> elem.write();
> }
>
> void writeB()
> {
> // Only call .write on B's
> // How do I get the B's from the array of I's?
> }
void writeB()
{
I'm trying to create a fairly generic component system, where an
object iterates over a bunch of other objects that all implement
a certain interface.
And this all works fine, however, I would also like to be able to
get objects of a specific type (a la instanceOf), and I can't
figu
On 2012-08-02 05:06, Jonathan M Davis wrote:
if(cast(Class)obj)
is the canonical way to do it.
Or, to use the value after the cast:
if (auto foo = cast(Class) obj)
// use foo
--
/Jacob Carlborg
On Thursday, August 02, 2012 03:59:01 Maxime Chevalier wrote:
> Getting started with D. I've been doing alot of googling trying
> to find out what's the best way to check if an object is an
> instance of some class. So far, I found you could do:
>
> if (typeid(obj) == typeid(Class)) doSomething();
On Thursday, 2 August 2012 at 01:59:02 UTC, Maxime Chevalier
wrote:
These both seem a little clumsy, however. Is there a better way
to do this?
I don't know if it is the best way, but I use the cast myself,
though I like using a little wrapper:
T instanceof(T)(Object o) if(is(T ==
Getting started with D. I've been doing alot of googling trying
to find out what's the best way to check if an object is an
instance of some class. So far, I found you could do:
if (typeid(obj) == typeid(Class)) doSomething();
or:
if (cast(Class)obj) doSomething();
These both seem a little c
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