Prior to 1.48, Boost.Pool used a singleton base class. It was an implementation detail, now removed, but some external packages depended upon it. This is an upstream bug, since the class was never intended as a public interface.
The breakage may manifest in a couple of ways: * boost/pool/detail/singleton.hpp: No such file or directory * 'singleton_default' in namespace 'boost::details::pool' does not name a type The class in singleton.hpp is small enough that it could simply be included directly into the using source code.
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