- **status**: Fixed --> Verified
---
** [issues:#4842] Bring Scheme_engraver in line with other translators.**
**Status:** Verified
**Labels:** Fixed_2_19_42
**Created:** Tue May 03, 2016 09:25 PM UTC by David Kastrup
**Last Updated:** Tue May 10, 2016 08:27 AM UTC
**Owner:** David Kastrup
Bring Scheme_engraver in line with other translators.
A whole load of commits. First uploads will be for issue 4840 and
4841 which are not in master yet.
Commits in reverse order:
Don't special-case Scheme_engraver's methods
Don't special-case Scheme_engraver's acknowledgers
Store acknowledgers in a Scheme_hash_table
Replace Translator_method et al
All of Translator_method, Translator_group_method,
Translator_group_void_method, Callback can be expressed via SCM now.
Translator_method_binding is replaced with Method_instance.
Replace Engraver_dispatch_entry with Method_instance
This also replaces a lot of C++-centric callback machinery (like the
Grob_info_callback type) with SCM-based code.
Add Method_instance class
This is a lightweight container class combining an SCM method call
with a particular instance into a C++ callable.
Add Callback0_wrapper and Callback2_wrapper class
Those are for callbacks with 0 and 2 SCM arguments, respectively. The
former are needed mainly for translator callbacks, the second for
acknowledgers.
Issue 4841: Let Scheme_hash_table::get return SCM_UNDEFINED for unknown keys
Issue 4840: Make Translator/Performer/Engraver abstract base classes
It does not make sense for them to be instantiable.
http://codereview.appspot.com/297170043
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