...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Set whether the header and body are written separately.
void split( bool v);
When the split feature is enabled, the implementation will write only the octets corresponding to the serialized header first. If the header has already been written, this function will have no effect on output.