Bindings for values that can be on-stack or refcounted

[mzabaluev]

There are GLib types: GVariantBuilder, GVariantDict, and GVariantIter, that can be heap-allocated and then refcounted, or be created on stack which naturally does not allow refcounting.
Bindings for each of these would likely require three different types:

• an on-stack type, calling on-stack cleanup in Drop;
• a type implementing Refcount to represent heap-allocated structures;
• a type that implements most of the bound methods, with an AsRef-style conversion from the two types described above.

[gkoz]

What would be the point of creating those on the stack?

[mzabaluev]

What would be the point of creating those on the stack?

Performance, I guess. These structures are mostly used in the local scope, to build or iterate over a GVariant.