On 10/25/2012 09:24 PM, Calvin Walton wrote:
> On Thu, 2012-10-25 at 13:00 -0700, bsquared wrote:
>> I attempted a simple test using this:
>> 8< ------------------------------------------------
>> private static const Set<string> STATIC_SET;
>> static construct {
>> STATIC_SET = new HashSet<string> ();
>> STATIC_SET.add ("Hello");
>> STATIC_SET.add ("World");
>> }
>> ------------------------------------------------ >8
>>
>> with this result:
>> 8< ------------------------------------------------
>> valac --pkg gee-1.0 hello_set.vala
>> hello_set.vala:5.4-5.47: error: `Gee.Set<string>' not supported as type
>> for constants
>> private static const Set<string> STATIC_SET;
>> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>> hello_set.vala:8.3-8.16: error: The name `add' does not exist in the
>> context of `HelloTest.STATIC_SET'
>> STATIC_SET.add("Hello");
>> ^^^^^^^^^^^^^^
>> hello_set.vala:9.3-9.16: error: The name `add' does not exist in the
>> context of `HelloTest.STATIC_SET'
>> STATIC_SET.add("World");
>> ^^^^^^^^^^^^^^
>> Compilation failed: 3 error(s), 0 warning(s)
>> ------------------------------------------------ >8
>>
>>
>> To my untrained eye this appears to indicate that I cannot use these as
>> constants. If I drop 'const' from the declaration it compiles and runs
>> correctly.
>
> This is the expected result - if the Set is constant, then you can't
> call the add method on it. It looks like the Gee Set type simply doesn't
> support being used as a constant.
>
> I think that the only types that you can actually use as constants in
> Vala are ones that compile to basic/simple C types, and therefore could
> be created using constant C initializers. If you have to write data to
> the object at run-time to fill it, it's not a compile-time constant,
> after all.
>
> This limits you to using things like arrays of structures, for example.
>
> If you really want a run-time initialized Set, then it will have to be
> non-const.
>
>
>
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>
Thanks for the response. I'll have to dig deeper into the java source
to determine why it was coded as a HashSet instead of an Array.
--
Regards,
Brian
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