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arg_parser_demo.cc File Reference
Demo Programs

## Detailed Description

This example shows how the argument parser can be used.

/* -*- mode: C++; indent-tabs-mode: nil; -*-
*
* This file is a part of LEMON, a generic C++ optimization library.
*
* Copyright (C) 2003-2010
* Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
* (Egervary Research Group on Combinatorial Optimization, EGRES).
*
* Permission to use, modify and distribute this software is granted
* provided that this copyright notice appears in all copies. For
* precise terms see the accompanying LICENSE file.
*
* This software is provided "AS IS" with no warranty of any kind,
* express or implied, and with no claim as to its suitability for any
* purpose.
*
*/
#include <lemon/arg_parser.h>
using namespace lemon;
int main(int argc, char **argv)
{
// Initialize the argument parser
ArgParser ap(argc, argv);
int i;
std::string s;
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("...");
// Throw an exception when problems occurs. The default behavior is to
// exit(1) on these cases, but this makes Valgrind falsely warn
// about memory leaks.
ap.throwOnProblems();
// Perform the parsing process
// (in case of any error it terminates the program)
// The try {} construct is necessary only if the ap.trowOnProblems()
// setting is in use.
try {
ap.parse();
} catch (ArgParserException &) { return 1; }
// Check each option if it has been given and print its value
std::cout << "Parameters of '" << ap.commandName() << "':\n";
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: " << 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:
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";
return 0;
}
`#include <lemon/arg_parser.h>`