• ixid (8/8) Aug 09 2015 This seems like a reasonable use but errors, obviously I can do
• anonymous (9/17) Aug 09 2015 That's because the offsets of the elements are different. Reading
• ixid (4/6) Aug 09 2015 It seems like bearophile beat me to it. Good to see he's still
• Steven Schveighoffer (3/8) Aug 10 2015 PR: https://github.com/D-Programming-Language/phobos/pull/3544
• Timon Gehr (5/13) Aug 09 2015 Array literals do cast implicitly.

"ixid" <nuaccount gmail.com> writes:

This seems like a reasonable use but errors, obviously I can do 
it in many other ways:

     ulong[] result = iota(1UL, 10UL).array;


Error: static assert  "Argument types in (ulong) are not all 
convertible to size_t: 
(ulong)"	C:\D\dmd2\src\phobos\std\array.d	516	

And while I'm here why do arrays not implicitly cast? ulong is 
happy to accept uint values but ulong[] will not accept uint[].

"anonymous" <anonymous example.com> writes:

On Sunday, 9 August 2015 at 20:13:38 UTC, ixid wrote:
 This seems like a reasonable use but errors, obviously I can do 
 it in many other ways:

     ulong[] result = iota(1UL, 10UL).array;


 Error: static assert  "Argument types in (ulong) are not all 
 convertible to size_t: 
 (ulong)"	C:\D\dmd2\src\phobos\std\array.d	516	

Yup, bug. Please file an issue at <http://issues.dlang.org/>.

 And while I'm here why do arrays not implicitly cast? ulong is 
 happy to accept uint values but ulong[] will not accept uint[].

That's because the offsets of the elements are different. Reading 
a ulong means reading 8 bytes. But in a uint[] every element only 
takes up 4 bytes. So every 2 uint elements would be combined into 
one ulong. And if the uint[] doesn't have an even number of 
elements, you'd read beyond array bounds.

You can do that conversion explicitly, but for an implicit 
conversion that would be too surprising.

"ixid" <nuaccount gmail.com> writes:

On Sunday, 9 August 2015 at 20:33:10 UTC, anonymous wrote:
 On Sunday, 9 August 2015 at 20:13:38 UTC, ixid wrote:

 Yup, bug. Please file an issue at <http://issues.dlang.org/>.

It seems like bearophile beat me to it. Good to see he's still 
alive.

https://issues.dlang.org/show_bug.cgi?id=14832

Steven Schveighoffer <schveiguy yahoo.com> writes:

On 8/9/15 4:40 PM, ixid wrote:
 On Sunday, 9 August 2015 at 20:33:10 UTC, anonymous wrote:
 On Sunday, 9 August 2015 at 20:13:38 UTC, ixid wrote:

 Yup, bug. Please file an issue at <http://issues.dlang.org/>.

 It seems like bearophile beat me to it. Good to see he's still alive.

 https://issues.dlang.org/show_bug.cgi?id=14832

PR: https://github.com/D-Programming-Language/phobos/pull/3544

-Steve

Timon Gehr <timon.gehr gmx.ch> writes:

On 08/09/2015 10:13 PM, ixid wrote:
 This seems like a reasonable use but errors, obviously I can do it in
 many other ways:

      ulong[] result = iota(1UL, 10UL).array;


 Error: static assert  "Argument types in (ulong) are not all convertible
 to size_t: (ulong)"    C:\D\dmd2\src\phobos\std\array.d    516
 ...

I consider this to be a bug. Also, it's annoying static assert abuse.

 And while I'm here why do arrays not implicitly cast?

Array literals do cast implicitly.

 ulong is happy to accept uint values but ulong[] will not accept uint[].

Many reasons. E.g. it would be a hidden not-necessarily-constant-time 
operation.