[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[netCDF #MSV-188900]: C++ API for NETCDF version 4.0

This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.

  • Subject: [netCDF #MSV-188900]: C++ API for NETCDF version 4.0
  • Date: Wed, 18 Mar 2009 19:08:48 -0600
Lynton,

> I am currently  looking at NcCompoundType related functions
> addCompoundType and addMember (see ncfile.cpp and ncvar.cpp).
> It seems to me that the that addCompoundType should be a template
> function with one of its arguments being the user-defined structure
> (currently onky the size of the structure is required). The
> addCompoundType function should identify and store the (a) the size of
> the structure (b) the members of the struture, recording them as
> strings, and (c) the offset of each member.
> That way it will enable addMember to make all the required calls to
> nc_insert_compound for a single structure in one call, without the user
> having to supply more information about the structure members. Also it
> will make putting data into the structures easier.
>
> However, is it possible to extract the information about the structure
> automatically? I have been looking hard on the web for some help on this
> and have so far failed.
>
> Any ideas?

I'm no C++ expert, but I think what you want is a "reflection" capability for
C++.  The
language lacks general reflection functionality, but RTTI is a start.  Here is
what looks
like a good summary of possible approaches along with their advantages and
disadvantages
and an implementation:

   http://www.garret.ru/cppreflection/docs/reflect.html

Another implementation of a C++ reflection library and a later improvement are
available
here, but I don't know anything about the quality or usefulness of these
techniques for the
specific problem you are trying to solve:

  http://www.codeproject.com/KB/library/libreflection.aspx
  http://www.codeproject.com/KB/library/libreflection2.aspx

--Russ




Russ Rew                                         UCAR Unidata Program
address@hidden                     http://www.unidata.ucar.edu



Ticket Details
===================
Ticket ID: MSV-188900
Department: Support netCDF
Priority: Normal
Status: Closed