a shared_ptr to a heap-allocated AMQBody subclass, it holds the
body in-line in a boost::variant of all the concrete AMQBody
subclasses. Actually there are nested variants, the compiler
does not cope well with a single variant of 130-some types.
Creating, encoding and decoding a local Frame doess 0 heap
allocation apart from that done by the concrete
AMQBody::encode/decode - e.g. method bodies with std::string
fields. for method bodies
All variants contain type boost::blank. This guarantees 0 heap
alloocation by the variant and represents the "uninitialized"
state. variant.h provides NoBlankVisitor to help write visitors
for variants containing blank.
* src/qpid/framing/MethodHolder.h, .cpp: Holds a variant
containing a method body.
* src/qpid/framing/Frame.h, .cpp: New Frame holds body in a
variant rather than via heap allocation.
* src/qpid/framing/variant.h: Utilities for using boost::variant.
* src/qpid/framing/amqp_types.h: Added FrameType typedef.
* src/qpid/framing/AMQMethodBody.h: Friends with MethodHolder.
* src/Makefile.am:
- Improved ruby generation rule.
- Run method_variants template.
- Added new source files
- Pre-compiled header rule for method_variants.h
* rubygen/templates/method_variants.rb: Generate variants
to hold methods of each class, and MethodVariant to hold all
the class variants.
* rubygen/cppgen.rb: variant, tuple methods.
* MethodBodyClass.h.tmpl: Added default constructor to method bodies.
* amqpgen.rb (AmqpRoot::merge): fix bug in merge.
git-svn-id: https://svn.apache.org/repos/asf/incubator/qpid/trunk/qpid@563683 13f79535-47bb-0310-9956-ffa450edef68