Changeset 69206

Timestamp:

Feb 23, 2011, 1:25:44 PM (12 years ago)

Author:

cppljevans

Message:

WHAT:

Added host_abstract metafunction to do reverse of hosts_concrete.

WHY:

solve problem when concrete val or ref passed to functor. In this
case, hosts_concrete<HostConcrete>::type is undefined, resulting in
compile-time error:

​http://groups.google.com/group/comp.lang.c++/msg/824f1eac9a49d40d

WHYNOT:

1) requires defining specialization of host_abstract for each

derived class.

2) causes conversion of a concrete class back to its abstract

class and then extra virtual function calls to then
convert back to concrete class.

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