constant expression

[Steven Schveighoffer via Digitalmars-d-learn]

On 2/23/16 3:00 AM, Nicholas Wilson wrote:
> On Tuesday, 23 February 2016 at 07:43:37 UTC, Ali Çehreli wrote:
>> On 02/22/2016 11:38 PM, Nicholas Wilson wrote:
>>
>>> I've tried with both mutable and immutable a module scope. Scope I want
>>> is global (don't care about mutability)
>>>
>>
>> Uncomment immutable if you want immutable and remove 'shared' if you
>> want multiple of this per thread (probably not).
>>
>> /* immutable */ string[string] ctodtypes;
>>
>> shared static this() {
>>     ctodtypes =
>>     [
>>         "void"      : "void",
>>         "uint32_t"  : "uint",
>>         "uint64_t"  : "ulong",
>>         "int32_t"   : "int",
>>         "int64_t"   : "long",
>>         "char"      : "char",
>>         "uint8_t"   : "ubyte",
>>         "size_t"    : "size_t",
>>         "float"     : "float"
>>      ];
>> }
>>
>> void main() {
>>     ctodtypes["hello"] = "world";
>> }
>>
>> Ali
>
> Thanks
>
> Silly question. Why is this necessary?

D cannot create associative arrays at compile time that can be used 
during runtime. You have to create them at runtime.

It could probably do effectively what is done above, however. Just 
nobody has made that enhancement.

-Steve