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Full Discussion: Input arguments with C++
Top Forums Programming Input arguments with C++ Post 302756607 by kristinu on Wednesday 16th of January 2013 06:46:14 AM
Old 01-16-2013
Input arguments with C++
I am using getopt_long to pass arguments to a C++ program. Arguments are passed with a key and a value separated by a space of '=' sign. Some options do not need to assign a value to them.

Example:

Code:
./raytrac dist=0.3 --color

I have some classes that need to use some of these parameters ant created a class Parsing to handle the arguments passed from argv.

Code:
   bool  Parsing::get_int
   bool  Parsing::get_float
   bool  Parsing::get_vect2
   bool  Parsing::get_string

Then if a class (let us say Tomog) needs those parameters I call

Code:
Tomog::set_param(Pc)

Where Pc is of class Parsing. Pc is a list associating a key with the corresponding argument. If the key matches you get the value.

Example

Code:
    float f;
    if (Pc.get_string("--dist",f)) {

Hence if the user passed --dist=0.3, f will contain the value 0.3

I am wondering what people think about this system of passing command line variables. And suggestions if there are better ways to do this.

Some more details of Tomog::set_param is given below



Code:
void Tomog::set_param (
  Parsing&  Pc
) {

  int  i;
  int  nf;

  String  s;
  String  T;

    if (Pc.get_string("--lglvl",s)) {
    if ( !get_log_level(s, lglvl) ) {
      error("invalid value for --lglvl");
    }
    cerr << "Tomog::set_param, --lglvl = " << s << endl;
  } else {
    lglvl = normal;
    cerr << "Tomog::set_param, --lglvl = normal = " << lglvl << endl;
  }
float f;
 if (Pc.get_float("--dist", f)) {
    nf = s.nfields(':');
    if (nf < NLayers) {
      error ("value for --nzs is less than the number of layers");
    }
    cerr << "Tomog::SetParam, nzs = " << s << endl;
    for (i = 0; i < NLayers; i++) {
      T = s.get_token(':');
      T >> NzS[i];
    }
  } else {
    NzS.fill(2);
  }

  ifstream  ifs_base;
  Parsing  Pb;
  if ( !Pc.get_string("--ifbase", s) ) {
    error ("no value for --ifbase");
  }
  ifs_base.open(s);
  if (ifs_base.bad()) {
    error ("ifs_base failed to open");
  }
  Pb.parse_file(ifs_base);
  if (lglvl >= medium) {
    cerr << "Tomog::set_param, --ifbase = " << s << endl;
  }

  // get model boundaries from base file

  Vect2  Xi;
  Vect2  Xf;
  Pb.get_vect2("XI", Xi);
  Pb.get_vect2("XF", Xf);

  cerr << "Tomog::set_param: Xi = " << Xi << endl;
  cerr << "Tomog::set_param: Xf = " << Xf << endl;

// Read Travel Time Data File --------------------------------------------------

  Parsing  Pd;

  // tdat ----------------------------------------------------------------------
  // name of file containing travel times

  ifstream  ifs_tdat;
  if ( !Pc.get_string("--iftdat", s) ) {
    error ("no value for --iftdat");
  }
  ifs_tdat.open (s);
  if (ifs_tdat.bad()) {
    error ("ifs_tdat failed to open");
  }
  cerr << "Tomog::SetParam, ifs_tdat = " << s << endl;
  Pd.parse_file (ifs_tdat);

  Mod.set_data(Pd);
  Mod.set_param(Pc);    // calling ModMisfit::SetRealData

 

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