Hi Robert, Robert Ramey wrote:
John Pye wrote:
However I keep seeing the same error message, and can't work out what it means.
Try the following change:
int main(int argc, char *argv[]){
const dd D(10,20); // note: const const int x = 5; // note const
OK, so objects-to-be-serialised must always be const. I didn't understand the rationale but I'll accept that there a good-but-obscure reason for it. I have a problem now with the BOOST_IS_ABSTRACT(ClassName) macro. What header file(s) must I include in order for that macro to behave correctly? Note that I am inside a namespace{...}when I write this macro. Should that be OK? Finally, if my base class is abstract and also contains no data requiring serialisation (I guess it's a base class for a Composite design pattern) then is it OK that my serialize(...) routine is empty? Cheers JP My output: ------8<------- object.h:56: error: ‘is_abstract’ is not a template object.h:56: error: explicit specialization of non-template ‘optx::boost::serialization::is_abstract’ object.h:56: error: ‘mpl’ has not been declared object.h:56: error: ISO C++ forbids declaration of ‘bool_’ with no type object.h:56: error: typedef name may not be a nested-name-specifier object.h:56: error: expected ‘;’ before ‘<’ token ... -------------- My header file: ------8<-------- ... #include <boost/archive/tmpdir.hpp> #include <boost/archive/text_iarchive.hpp> #include <boost/archive/text_oarchive.hpp> #include <boost/serialization/base_object.hpp> #include <boost/serialization/utility.hpp> #include <boost/serialization/list.hpp> namespace optx{ class Point; /** Class to hold a generic 3-D object. Basic geometric operations of rotation and translation will be provided as virtual methods. */ class Object{ ... ---------------