Changeset a0d83b4 in Lumiera

Timestamp:

2026-04-07T23:53:53Z (2 weeks ago)

Author:

Ichthyostega <prg@…>

Branches:

dev/play

Children:

2c8ee05

Parents:

0760525

git-author:

Ichthyostega <prg@…> (07/04/26 21:28:44)

git-committer:

Ichthyostega <prg@…> (07/04/26 23:53:53)

Message:

Library: investigate design for an opaque inline functor

This is a design study to find out what would be required
to build an opaque function wrapper, similar to std::function,
yet without using any heap memory ever.

Such a building block would allow for some interesting options
for a well structured design of elaborate data structures.

This changeset provides an implementation draft.

Two important findings to note:

• it is impossible to get away with just a single function pointer
• because at the very least we need to invoke the destructor of the embedded delegate. Thus something akin to a "manager" is required.
• this implies that the component would not be so efficient as I hoped, since it requires two pointers and requires to emit code for each type of delegate.
• by making the component NonCopyable, I avoided the complexities of virtual copy support. In case the latter is desired, it would be much simpler to switch to a classical OO approach with a VTable and use our PolymorphicValue wrapper to handle copy and cloning.

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