• "cal" <callumenator gmail.com> Aug 04 2012
• Philippe Sigaud <philippe.sigaud gmail.com> Aug 04 2012
• "cal" <callumenator gmail.com> Aug 05 2012
• Philippe Sigaud <philippe.sigaud gmail.com> Aug 05 2012
• "cal" <callumenator gmail.com> Aug 05 2012

"cal" <callumenator gmail.com> writes:

In the following code:

Variant j;
j = 1.0; // make it a double
auto x = cast(float)(j.get!(double)); // fail: cannot cast 
j.get!(double)
auto y = cast(float)x; // fine

The first attempt to cast doesn't compile, but the second 
less-direct cast is OK. Is that a bit strange?

Philippe Sigaud <philippe.sigaud gmail.com> writes:

On Sun, Aug 5, 2012 at 5:40 AM, cal <callumenator gmail.com> wrote:
 In the following code:

 Variant j;
 j = 1.0; // make it a double
 auto x = cast(float)(j.get!(double)); // fail: cannot cast j.get!(double)
 auto y = cast(float)x; // fine


I think it's a property-like problem: you need () after .get!()
I had this problem a few days ago.


Variant j;
j = 1.0; // make it a double
auto x = cast(float)(j.get!(double)()); // fine
auto y = cast(float)x; // fine

"cal" <callumenator gmail.com> writes:

On Sunday, 5 August 2012 at 06:31:37 UTC, Philippe Sigaud wrote:
 On Sun, Aug 5, 2012 at 5:40 AM, cal <callumenator gmail.com> 
 wrote:
 In the following code:

 Variant j;
 j = 1.0; // make it a double
 auto x = cast(float)(j.get!(double)); // fail: cannot cast 
 j.get!(double)
 auto y = cast(float)x; // fine


 I think it's a property-like problem: you need () after .get!()
 I had this problem a few days ago.


 Variant j;
 j = 1.0; // make it a double
 auto x = cast(float)(j.get!(double)()); // fine
 auto y = cast(float)x; // fine


Ah thanks!, I didn't even think of that.

Philippe Sigaud <philippe.sigaud gmail.com> writes:

On Sun, Aug 5, 2012 at 6:34 PM, cal <callumenator gmail.com> wrote:

 Variant j;
 j = 1.0; // make it a double
 auto x = cast(float)(j.get!(double)()); // fine

 auto y = cast(float)x; // fine



 Ah thanks!, I didn't even think of that.


Btw, std.variant.Variant also offers a `.coerce` method:

auto x = j.coerce!float; // fine

No need of parenthesis on this one.

See also `.convertsTo`

http://dlang.org/phobos/std_variant.html#convertsTo

"cal" <callumenator gmail.com> writes:

On Sunday, 5 August 2012 at 18:04:41 UTC, Philippe Sigaud wrote:
 On Sun, Aug 5, 2012 at 6:34 PM, cal <callumenator gmail.com> 
 wrote:

 Variant j;
 j = 1.0; // make it a double
 auto x = cast(float)(j.get!(double)()); // fine

 auto y = cast(float)x; // fine



 Ah thanks!, I didn't even think of that.


 Btw, std.variant.Variant also offers a `.coerce` method:

 auto x = j.coerce!float; // fine

 No need of parenthesis on this one.

 See also `.convertsTo`

 http://dlang.org/phobos/std_variant.html#convertsTo


Even better :)