I would not expect this to work.
const char* const_temp = temp.c_str( );
provides a cont char * - but this pointer is only temporary and becomes
invalid when the function creating it returns. Hence the run time error.
Assuming that dynamically assigning a tag name is a good idea (I'll reserver
judgement on this for now), I don't think that nvp is the right vehicle to
try to do this. I would guess that you'd have to make your own "wrapper"
which makes a copy of the "tag". The nvp specifically avoids doing this for
efficiency reasons
Robert Ramey
"Hammond, John (UK New Malden)" wrote in
message
news:69E82C655BA624438EC192FB2D5B54DB023C76D1@GLKMS2100.GREENLNK.NET...
Hello,
I am hoping someone could answer a question I have regarding the
make_nvp(..) function of the Serialization library.
I am attempting to serialize a number of objects within a loop, and the name
of the name-value-pair is to be assigned dynamically depending on some
values taken from within the object that is to be serialized. I am currently
performing the actions below:
my_obj = GetMyObj(..);
std::string temp = str( boost::format("x:%1% y:%2%") % _x % _y );
const char* const_temp = temp.c_str( );
ar & boost::serialization::make_nvp(const_temp, my_obj);
This code compiles but will cause an exception on make_nvp. As far as I can
tell, I am providing the function with the const char* that it requires, so
am very confused as to why it is not performing as expected.
Any help with this would be greatly appreciated.
John Hammond
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