All of the header files in this dir (sqlplusint) are internal. This means that you should never include any of these directly in your programs as they are subject to change from one relese to another.
For those interesting in improving the code the files are laid out in the following fashion:
name0.hh: Header files ending in a 0.hh generally cantains macro
defantions and other messy stuff.
name1.hh:Header files ending in 1.hh contain just the class as
functions declartions and really simple inline functions. A 1.hh
header file should never include anything but other 1.hh header
files.
name2.hh:Header files ending in 2.hh contain inline functions and
methods. They should generally only include other 1.hh or 2.hh
header files however they may also include 3.hh and 4.hh header
files if, for example, they want to instantiate the nessary template
functions.
name3.hh:Header files ending in 3.hh contain non-inline template
functions and methods.
name4.hh:Header files ending in 4.hh contain template functions in
which are the nessary instances should already be instanstaed. Thus
these should never be included in the end users program. Only
within other 4.hh or .cc files in this directory.
name.cc:These contain the actual functions and methods coresponding
the the appreate header file. They may include templates procided
that the nessary instances will all be instantiated by the end of
the .cc file