Remove boost dependencies from C++ client API
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Key: QPID-1780
URL: https://issues.apache.org/jira/browse/QPID-1780
Project: Qpid
Issue Type: Bug
Components: C++ Client
Affects Versions: M4
Reporter: Steve Huston
Currently there is a dependency on Boost headers being present when building a
Qpid client application. I believe that Qpid client programmers should not have
to be exposed to Boost just for building Qpid applications. It's a Bad Idea to
impose a requirement such as this on all users - Boost is a supporting artifact
of the implementation and shouldn't be a requirement for users.
More pointedly, it could cause version skew on Windows installed kits. Unlike
on RHEL, Windows doesn't offer Boost packages as part of the vendor-supplied OS
kit. So, Windows users needing Boost must get their kit somewhere else. This
makes it impossible to predict what version of Boost will (or won't) be on a
user's system. To take care of this, the Windows installable kit is currently
including the needed Boost DLLs that the kit is built against within the
install. This removes the need to have Boost installed by the user prior to
installing/using Qpid and isolates Qpid's binaries from whatever Boost version
is present if there is one. This is a Good Thing except that when trying to
build a client app (such as the Qpid examples) Boost ends up getting pulled in
from the client API at build time. This is bad because the user now needs to go
install Boost. If it's not the same version that the installed kit was built
against, there's a chance that object sizes, methods, etc. will differ between
what Qpid was built with and what the user installed.
The case that brought this up immediately is that qpid/SessionId.h derives from
boost::totally_ordered1<SessionId>. Since qpid/client/Session_Base_0_10.h
defines a method which returns a SessionId by value, it needs to pull in
SessionId.h which yields a compile error if Boost is not available.
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