diff -r c6d537888fe5 -r df6a32249b46 demo/arg_parser_demo.cc
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/demo/arg_parser_demo.cc	Sat Mar 03 12:05:05 2007 +0000
@@ -0,0 +1,53 @@
+#include <lemon/arg_parser.h>
+
+using namespace lemon;
+int main(int argc, char **argv)
+{
+  ArgParser ap(argc,argv);
+  int i;
+  std::string s;
+  double d;
+  bool b,sil;
+  bool g1,g2,g3;
+  ap.option("n", "an integer input", i, true)
+    .option("val", "a double input", d)
+    .synonym("vals","val")
+    .option("name", "a string input", s)
+    .option("f", "a switch", b)
+    .option("nohelp", "", sil)
+    .option("gra","Choise A",g1)
+    .option("grb","Choise B",g2)
+    .option("grc","Choise C",g3)
+    .optionGroup("gr","gra")
+    .optionGroup("gr","grb")
+    .optionGroup("gr","grc")
+    .mandatoryGroup("gr")
+    .onlyOneGroup("gr")
+    .other("infile","The input file")
+    .other("...");
+  
+  ap.parse();
+
+  std::cout << "Parameters of '" << ap.commandName() << "':\n";
+
+  if(ap.given("n")) std::cout << "  Value of -n: " << i << std::endl;
+  if(ap.given("val")) std::cout << "  Value of -val: " << 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;
+
+  switch(ap.files().size()) {
+  case 0:
+    std::cout << "  No file argument was given.\n";
+    break;
+  case 1:
+    std::cout << "  1 file argument was given. It is:\n";
+    break;
+  default:
+    std::cout << "  "
+	      << ap.files().size() << " file arguments were given. They are:\n";
+  }
+  for(unsigned int i=0;i<ap.files().size();++i)
+    std::cout << "    '" << ap.files()[i] << "'\n";
+  
+}