I looked up the typedef of string;

typedef basic_string<char, char_traits<char>, allocator<char> >
 string;

Then made my own typedef;

typedef basic_string<char, char_traits<char>, NewAllocator<char> >
 stringWithAllocator;

..and registered this with boost in the string.hpp;

BOOST_CLASS_IMPLEMENTATION(stringWithAllocator, boost::serialization::primitive_type)

Then the code compiles, but serialization does not work. It seems the allocator is part of the object when serialized, and since the allocator has members the size is being calculated wrong. I did a work around using a std::vector<char, NewAllocator<char>>. This is not as smooth, but does the job.

/Jacob Holm