Serialization/deserialization of templated class

[Eugene Wissner via Digitalmars-d]

On Wednesday, 28 June 2017 at 05:52:38 UTC, Dmitry Solomennikov 
wrote:
> On Wednesday, 28 June 2017 at 05:01:17 UTC, Eugene Wissner 
> wrote:
>> On Wednesday, 28 June 2017 at 04:41:25 UTC, Dmitry 
>> Solomennikov wrote:
>
>
>> Probably if you have serialized data, you convert strings to 
>> other types, so it may be possible to perfom if-checks:
>> if (myDataIsStringAndDouble(data))
>> {
>>   auto var = new Some!(Pair!(string, double))(new 
>> Pair!(string, double)("df", 5.0));
>> }
>> else if (myDataIsStringAndInt(data))
>> {
>>   auto var = new Some!(Pair!(string, int))(new Pair!(string, 
>> int)("df", 5));
>> }
>
> It is possible, but it is not a general solution. I've posted 
> couple of sample classes, but there are more complicated cases, 
> of course, and it well be combinatorial explosion here.
>
> I got the Variant idea, I'll give it a try.
> From other point of view, is there a reflection, say
>
> auto i = newInstance("Pair!(int, string)(10, \"asdf\")"),
>
> something like in Java?

As far as I know, Java can modify the byte code at runtime. D is 
a compiled language. It has good compile-time reflection. Anyway 
you have to find a way to initialize the classes with the types 
you need. If the type isn't initialized at compile-time, it isn't 
just there at runtime and can't be used.