[tialaramex]

Maybe I don't understand, in D, how do I write a function which makes a new type?

For example Zig has a function ArrayHashMapWithAllocator which returns well, a hash table type in a fairly modern style, no separate chaining and so on

Not an instance of that type, it returns the type itself, the type didn't exist, we called the function, now it does exist, at compile time (because clearly we can't go around making new types at runtime in this sort of language)

[pjmlp]

You use templates and string mixins alongside each other.

The issue with mixins is that using string concatenation to build types on the fly isn't the greatest debugging experience, as there is only printf debugging available for them.

[WalterBright]

See my other post.