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boost::signals2::deconstruct_access — Gives deconstruct access to private/protected constructors.
// In header: <boost/signals2/deconstruct.hpp> class deconstruct_access { };
Declaring deconstruct_access a friend to your class will give the
deconstruct factory function access to your class' private and
protected constructors. Using private
constructors in conjunction with deconstruct_access
can be useful to
ensure postconstructible or predestructible
objects are always created
properly using deconstruct.