Changeset 204:77d56a21c3ab in lemon-1.2 for demo/arg_parser_demo.cc

Timestamp:

07/12/08 10:21:44 (16 years ago)

Author:

Peter Kovacs <kpeter@…>

Branch:

default

Phase:

public

Message:

Doc improvements related to ArgParser?

File:

• demo/arg_parser_demo.cc (modified) (2 diffs)

demo/arg_parser_demo.cc

@@ -30 +30 @@
 int main(int argc, const char **argv)
 {
-  ArgParser ap(argc,argv);
+  // Initialize the argument parser
+  ArgParser ap(argc, argv);
   int i;
   std::string s;
-  double d;
-  bool b,sil;
-  bool g1,g2,g3;
-  ap.refOption("n", "An integer input.", i, true)
-    .refOption("val", "A double input.", d)
-    .doubleOption("val2", "A double input.", d)
-    .synonym("vals","val")
-    .refOption("name", "A string input.", s)
-    .refOption("f", "A switch.", b)
-    .refOption("nohelp", "", sil)
-    .refOption("gra","Choice A",g1)
-    .refOption("grb","Choice B",g2)
-    .refOption("grc","Choice C",g3)
-    .optionGroup("gr","gra")
-    .optionGroup("gr","grb")
-    .optionGroup("gr","grc")
-    .mandatoryGroup("gr")
-    .onlyOneGroup("gr")
-    .other("infile","The input file.")
+  double d = 1.0;
+  bool b, nh;
+  bool g1, g2, g3;
+
+  // Add a mandatory integer option with storage reference
+  ap.refOption("n", "An integer input.", i, true);
+  // Add a double option with storage reference (the default value is 1.0)
+  ap.refOption("val", "A double input.", d);
+  // Add a double option without storage reference (the default value is 3.14)
+  ap.doubleOption("val2", "A double input.", 3.14);
+  // Set synonym for -val option
+  ap.synonym("vals", "val");
+  // Add a string option
+  ap.refOption("name", "A string input.", s);
+  // Add bool options
+  ap.refOption("f", "A switch.", b)
+    .refOption("nohelp", "", nh)
+    .refOption("gra", "Choice A", g1)
+    .refOption("grb", "Choice B", g2)
+    .refOption("grc", "Choice C", g3);
+  // Bundle -gr* options into a group
+  ap.optionGroup("gr", "gra")
+    .optionGroup("gr", "grb")
+    .optionGroup("gr", "grc");
+  // Set the group mandatory
+  ap.mandatoryGroup("gr");
+  // Set the options of the group exclusive (only one option can be given)
+  ap.onlyOneGroup("gr");
+  // Add non-parsed arguments (e.g. input files)
+  ap.other("infile", "The input file.")
     .other("...");
   
+  // Perform the parsing process
+  // (in case of any error it terminates the program)
   ap.parse();
 
+  // Check each option if it has been given and print its value
   std::cout << "Parameters of '" << ap.commandName() << "':\n";
 
-  if(ap.given("n")) std::cout << "  Value of -n: " << i << std::endl;
+  std::cout << "  Value of -n: " << i << std::endl;
   if(ap.given("val")) std::cout << "  Value of -val: " << d << std::endl;
+  if(ap.given("val2")) {
+    d = ap["val2"];
+    std::cout << "  Value of -val2: " << d << std::endl;
+  }
   if(ap.given("name")) std::cout << "  Value of -name: " << s << std::endl;
   if(ap.given("f")) std::cout << "  -f is given\n";
-  if(ap.given("nohelp")) std::cout << "  Value of -nohelp: " << sil << std::endl;
+  if(ap.given("nohelp")) std::cout << "  Value of -nohelp: " << nh << std::endl;
   if(ap.given("gra")) std::cout << "  -gra is given\n";
   if(ap.given("grb")) std::cout << "  -grb is given\n";
   if(ap.given("grc")) std::cout << "  -grc is given\n";
-                                     
+  
   switch(ap.files().size()) {
   case 0:
@@ -81 +100 @@
     std::cout << "    '" << ap.files()[i] << "'\n";
   
+  return 0;
 }