• Adel Mamin (7/7) Aug 13 2015 Compiler dmd_2.068.0-0_amd64.deb on Ubuntu 12.04 Linux:
• =?UTF-8?B?QWxpIMOHZWhyZWxp?= (14/21) Aug 13 2015 I think the problem is when the variable is defined at module scope. It
• BBasile (8/15) Aug 14 2015 It's because of the key type (string is a library type). You have
• anonymous (3/4) Aug 14 2015 This is not true. It's not because of the key type. And string is
• Temtaime (2/2) Aug 14 2015 It's because it's implemented in DMD only partly.

"Adel Mamin" <adel mm.st> writes:

Compiler dmd_2.068.0-0_amd64.deb on Ubuntu 12.04 Linux:

auto lookup = [ "one":1, "two":2 ];

The dmd error:
Error: non-constant expression ["one":1, "two":2]

Why doesn't it compile?
As a workaround I could do the assignment one element at a time 
in a loop. It would be uglier though.

=?UTF-8?B?QWxpIMOHZWhyZWxp?= <acehreli yahoo.com> writes:

On 08/13/2015 11:48 PM, Adel Mamin wrote:
 Compiler dmd_2.068.0-0_amd64.deb on Ubuntu 12.04 Linux:

 auto lookup = [ "one":1, "two":2 ];

 The dmd error:
 Error: non-constant expression ["one":1, "two":2]

I think the problem is when the variable is defined at module scope. It 
works inside functions, etc.

 Why doesn't it compile?
 As a workaround I could do the assignment one element at a time in a
 loop. It would be uglier though.

A better workaround is to initialize it in the module constructor:

immutable int[string] lookup;

shared static this()
{
     lookup = [ "one":1, "two":2 ];
}

void main()
{
     assert("one" in lookup);
}

Ali

"BBasile" <bb.temp gmx.com> writes:

On Friday, 14 August 2015 at 06:48:27 UTC, Adel Mamin wrote:
 Compiler dmd_2.068.0-0_amd64.deb on Ubuntu 12.04 Linux:

 auto lookup = [ "one":1, "two":2 ];

 The dmd error:
 Error: non-constant expression ["one":1, "two":2]

 Why doesn't it compile?
 As a workaround I could do the assignment one element at a time 
 in a loop. It would be uglier though.

It's because of the key type (string is a library type). You have 
to initialize it by hand. Explanation here:

http://stackoverflow.com/a/26862994/3661500

see the comment of Adam D. Ruppe. Although this case was 'a bit' 
different since the AA had to be immutable (in this case it was 
only possible to initialize it in a static module constructor or 
in class/struct constructor). But it's almost the same problem.

"anonymous" <anonymous example.com> writes:

On Friday, 14 August 2015 at 07:04:53 UTC, BBasile wrote:
 It's because of the key type (string is a library type).

This is not true. It's not because of the key type. And string is 
not a library type.

"Temtaime" <temtaime gmail.com> writes:

It's because it's implemented in DMD only partly.
There's a bug report associated with it.