CCfits - HEASARC - NASA

4.3 Modularity 10
4.3 Modularity
Third, in an object oriented design, it is possible to make a program only loosely dependent
on current implementation assumptions. In XSPEC, data are read as SF and
FITS format (of three different varieties) and the user interface is written in tcl/tk. Both
of these assumptions could be changed over the future life of the program. Thus the
design of XSPEC, and any similar program, consists of defining an abstract DataSet
class which has a subclass that uses FITS data. The virtual functions that support reading
and writing can easily be overloaded by alternatives to FITS. Thus, the class library
specified here fits in with the need for modularity in design.
5 Getting Started
The program cookbook.cxx, analogous to the cookbook.c program supplied with cfitsio,
was generated to test the correct functioning of the parts of the library and to
provide a demonstration of its usage.
The code for cookbook is reproduced here with commentary as worked example of the
usage of the library.
5.1 Driver Program
// The CCfits headers are expected to be installed in a subdirectory of
// the include path.
// The header file contains all that is necessary to use both the
CCfits
// library and the cfitsio library (for example, it includes fitsio.h) thus
making
// all of cfitsio’s macro definitions available.
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
// this includes 12 of the CCfits headers and will support all CCfits
operations.
// the installed location of the library headers is $(ROOT)/include/CCfits
// to use the library either add -I$(ROOT)/include/CCfits or #include
// in the compilation target.
#include
#include
// The library is enclosed in a namespace.
using namespace CCfits;
Generated on Tue Dec 6 2011 16:12:51 for CCfits by Doxygen