• Hamborg (4/4) Jul 05 2017 I can test for exactly what what the args are with (_arguments[i]
• =?UTF-8?Q?Ali_=c3=87ehreli?= (5/9) Jul 06 2017 If it exists, it would be in std.traits or __traits. In this case it's
• Hamborg (7/19) Jul 06 2017 But how would I check _arguments[i]?
• Andrea Fontana (4/10) Jul 06 2017 Try with:
• Hamborg (3/15) Jul 06 2017 That compiles, but it returns false when I pass in a numeric
• Andrea Fontana (4/6) Jul 06 2017 I think you should provide a code snippet then. I think I missed
• Adam D. Ruppe (11/13) Jul 06 2017 You did - this question is about a runtime variadic which gives

Hamborg <fsdfsd gmail.com> writes:

I can test for exactly what what the args are with (_arguments[i] 
== typeid(int)) but if I just want to know if it's numeric and 
can pull it out as a double what should I do? I don't really want 
to test for int, uint, byte, float, etc individually.

=?UTF-8?Q?Ali_=c3=87ehreli?= <acehreli yahoo.com> writes:

On 07/05/2017 11:26 PM, Hamborg wrote:
 I can test for exactly what what the args are with (_arguments[i] ==
 typeid(int)) but if I just want to know if it's numeric and can pull it
 out as a double what should I do? I don't really want to test for int,
 uint, byte, float, etc individually.

If it exists, it would be in std.traits or __traits. In this case it's 
std.traits.isNumeric. :)

   https://dlang.org/phobos/std_traits.html#isNumeric

Ali

Hamborg <fsdfsd gmail.com> writes:

On Thursday, 6 July 2017 at 07:11:01 UTC, Ali Çehreli wrote:
 On 07/05/2017 11:26 PM, Hamborg wrote:
 I can test for exactly what what the args are with 
 (_arguments[i] ==
 typeid(int)) but if I just want to know if it's numeric and 
 can pull it
 out as a double what should I do? I don't really want to test 
 for int,
 uint, byte, float, etc individually.

 If it exists, it would be in std.traits or __traits. In this 
 case it's std.traits.isNumeric. :)

   https://dlang.org/phobos/std_traits.html#isNumeric

 Ali

But how would I check _arguments[i]?

When I do (isNumeric!_arguments[i]) I get an error saying:
"Error: template instance isNumeric!(_arguments) does not match 
template declaration isNumeric(T)"

or when I do (isNumeric!(_arguments[i])) I get this error:
"Error: variable _arguments cannot be read at compile time"

Andrea Fontana <nospam example.com> writes:

On Thursday, 6 July 2017 at 08:22:44 UTC, Hamborg wrote:

 But how would I check _arguments[i]?

 When I do (isNumeric!_arguments[i]) I get an error saying:
 "Error: template instance isNumeric!(_arguments) does not match 
 template declaration isNumeric(T)"

 or when I do (isNumeric!(_arguments[i])) I get this error:
 "Error: variable _arguments cannot be read at compile time"

Try with:
isNumeric!(typeof(_arguments[i]));

Andrea

Hamborg <fsdfsd gmail.com> writes:

On Thursday, 6 July 2017 at 08:35:05 UTC, Andrea Fontana wrote:
 On Thursday, 6 July 2017 at 08:22:44 UTC, Hamborg wrote:

 But how would I check _arguments[i]?

 When I do (isNumeric!_arguments[i]) I get an error saying:
 "Error: template instance isNumeric!(_arguments) does not 
 match template declaration isNumeric(T)"

 or when I do (isNumeric!(_arguments[i])) I get this error:
 "Error: variable _arguments cannot be read at compile time"

 Try with:
 isNumeric!(typeof(_arguments[i]));

 Andrea

That compiles, but it returns false when I pass in a numeric 
value... :(

Andrea Fontana <nospam example.com> writes:

On Thursday, 6 July 2017 at 12:15:56 UTC, Hamborg wrote:
 That compiles, but it returns false when I pass in a numeric 
 value... :(

I think you should provide a code snippet then. I think I missed 
something about your question.

Andrea

Adam D. Ruppe <destructionator gmail.com> writes:

On Thursday, 6 July 2017 at 12:26:11 UTC, Andrea Fontana wrote:
 I think you should provide a code snippet then. I think I 
 missed something about your question.

You did - this question is about a runtime variadic which gives 
you an array of TypeInfo objects, but all the answers are giving 
compile time things. None of them will work since the static type 
is some subclass of TypeInfo.

There is no method in the interface to do what the OP wants. 
You'll have to do a list of comparisons.... or hack druntime, it 
is fairly easy to add such a method... but that's not a realistic 
solution either.

Best option would perhaps be switching to a compile time variadic 
template.