Re: Verifying the arguments of a function with ref parameters?
On Thursday, 28 July 2016 at 21:49:00 UTC, pineapple wrote:
On Thursday, 28 July 2016 at 20:28:39 UTC, jdfgjdf wrote:
"Parameters!dgref.init" does not yield a reference. The real
error is not displayed. In a normal context it would be "stuff
is not callable with"
What would be a better way to check whether some callable can
be called using a parameters tuple?
Oh, I answered my own question
enum bool dgrefcallable = is(typeof((){auto params =
Parameters!dgref.init; dgref(params);}));
Re: Verifying the arguments of a function with ref parameters?
On Thursday, 28 July 2016 at 20:28:39 UTC, jdfgjdf wrote: "Parameters!dgref.init" does not yield a reference. The real error is not displayed. In a normal context it would be "stuff is not callable with" What would be a better way to check whether some callable can be called using a parameters tuple?
Re: Verifying the arguments of a function with ref parameters?
On Thursday, 28 July 2016 at 21:49:00 UTC, pineapple wrote: On Thursday, 28 July 2016 at 20:28:39 UTC, jdfgjdf wrote: "Parameters!dgref.init" does not yield a reference. The real error is not displayed. In a normal context it would be "stuff is not callable with" What would be a better way to check whether some callable can be called using a parameters tuple? http://dlang.org/phobos/std_traits#.lvalueOf
Re: Verifying the arguments of a function with ref parameters?
On Thursday, 28 July 2016 at 19:19:06 UTC, pineapple wrote:
Why doesn't this code do what I'd expect it to, and how can I
fix it?
unittest{
import std.traits : Parameters;
// Works as expected
alias dg = int delegate(int value);
enum bool dgcallable =
is(typeof((){dg(Parameters!dg.init);}));
pragma(msg, dgcallable); // Prints true
// Doesn't work as expected
alias dgref = int delegate(ref int value);
enum bool dgrefcallable =
is(typeof((){dgref(Parameters!dgref.init);}));
pragma(msg, dgrefcallable); // Prints false
}
Thanks!
"Parameters!dgref.init" does not yield a reference. The real
error is not displayed. In a normal context it would be "stuff is
not callable with"
Verifying the arguments of a function with ref parameters?
Why doesn't this code do what I'd expect it to, and how can I fix
it?
unittest{
import std.traits : Parameters;
// Works as expected
alias dg = int delegate(int value);
enum bool dgcallable =
is(typeof((){dg(Parameters!dg.init);}));
pragma(msg, dgcallable); // Prints true
// Doesn't work as expected
alias dgref = int delegate(ref int value);
enum bool dgrefcallable =
is(typeof((){dgref(Parameters!dgref.init);}));
pragma(msg, dgrefcallable); // Prints false
}
Thanks!
