Allow variant deserialization to make types with private constructors #339
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If a type has a private no-args constructor, but has friended boost::serialization::access, it can usually be deserialised as normal. However, it _can't_ be deserialized out of a variant, because the variant tries to invoke the default constructor. Fix this by constructing it through boost::serialization::access, which is designed to model "classes that can't be created with no arguments except through deserialization"
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If a type has a private no-args constructor, but has friended boost::serialization::access, it can usually be deserialised as normal. However, it can't be deserialized out of a variant, because the variant tries to invoke the default constructor.
Fix this by constructing it through boost::serialization::access, which is designed to model "classes that can't be created with no arguments except through deserialization"