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March 06 sqlite3 library which can read class instances (not structs)? | ||||
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 | Is there a sqlite3 interface library which can correctly read into instances? sqlite3-d will let me compile with a class, but it segv's when run. ddbc seems to support only structs, and I can use it to punch in one value at a time out of each row result. But that feels clunky, and I'd avoid it if I could. Thanks, | |||
March 10 Re: sqlite3 library which can read class instances (not structs)? | ||||
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Posted in reply to Andy Valencia | On Thursday, 6 March 2025 at 23:45:01 UTC, Andy Valencia wrote: >Is there a sqlite3 interface library which can correctly read into instances? sqlite3-d will let me compile with a class, but it segv's when run. ddbc seems to support only structs, and I can use it to punch in one value at a time out of each row result. But that feels clunky, and I'd avoid it if I could. Dug deeper into sqlite3-d, and see the problem. Is there a static-if which can tell if a type is of a struct, as opposed to a class? I see ones for a final class, or an abstract one. But nothing jumps out to let me know the correct way in a template method to allocate a struct instance as distinct from a class. Something like: >static if (__traits(isClass, T)) { Thanks, | |||
March 10 Re: sqlite3 library which can read class instances (not structs)? | ||||
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 Posted in reply to Andy Valencia | On Thursday, 6 March 2025 at 23:45:01 UTC, Andy Valencia wrote: >Is there a sqlite3 interface library which can correctly read into instances? sqlite3-d will let me compile with a class, but it segv's when run. ddbc seems to support only structs, and I can use it to punch in one value at a time out of each row result. But that feels clunky, and I'd avoid it if I could. Thanks, Did you try d2sqlite3? | |||
March 10 Re: sqlite3 library which can read class instances (not structs)? | ||||
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Posted in reply to Sergey | On Monday, 10 March 2025 at 21:39:39 UTC, Sergey wrote: >Did you try d2sqlite3? I looked at it, and it only documented struct operations. Given that I now understand the problem at hand, I'd rather go with a fix here than start over. Thanks, | |||
March 10 Re: sqlite3 library which can read class instances (not structs)? | ||||
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 Posted in reply to Andy Valencia | On 3/10/25 2:31 PM, Andy Valencia wrote:
> Is there a static-if
> which can tell if a type is of a struct, as opposed to a class?
[...]
> Something like:
>
>> static if (__traits(isClass, T)) {
>> ...
>> } else if (__traits(isStruct, T)) {
>> ...
>> } else {
>> (failure)
>> }
>
> Thanks,
> Andy
>
You would expect that to be provided by one of the following:
https://dlang.org/phobos/std_traits.html
https://dlang.org/spec/traits.html
But in this case it's the "is expression":
https://dlang.org/spec/expression.html#is_expression
static assert (is (S == struct));
Ali
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March 10 Re: sqlite3 library which can read class instances (not structs)? | ||||
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Posted in reply to Ali Çehreli | On Monday, 10 March 2025 at 22:55:03 UTC, Ali Çehreli wrote:
> You would expect that to be provided by one of the following:
>
> https://dlang.org/phobos/std_traits.html
>
> https://dlang.org/spec/traits.html
>
> But in this case it's the "is expression":
>
> https://dlang.org/spec/expression.html#is_expression
>
> static assert (is (S == struct));
I don't know how long I would have hunted for that without finding it. Thank you!
Andy
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