1 /* -*- mode: C++; indent-tabs-mode: nil; -*-
3 * This file is a part of LEMON, a generic C++ optimization library.
5 * Copyright (C) 2003-2008
6 * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
7 * (Egervary Research Group on Combinatorial Optimization, EGRES).
9 * Permission to use, modify and distribute this software is granted
10 * provided that this copyright notice appears in all copies. For
11 * precise terms see the accompanying LICENSE file.
13 * This software is provided "AS IS" with no warranty of any kind,
14 * express or implied, and with no claim as to its suitability for any
20 \page getting_started Getting Started
22 \section hello_lemon Compile Your First Code
24 If you have installed LEMON on your system you can paste the following
25 code segment into a file called <tt>hello_lemon.cc</tt> to have a first
26 working program that uses LEMON.
28 \dontinclude hello_lemon.cc
32 First let us briefly explain how this example program works.
33 (The used notions will be discussed in detail in the following chapter.)
35 After some convenience typedefs we create a directed graph (\e digraph)
36 and add some nodes and arcs to it.
37 ListDigraph is one of the digraph classes implemented in LEMON.
38 It is based on linked lists, therefore iterating through its nodes and
41 Then we iterate through all nodes of the digraph and print their unique
42 IDs. We use a constructor of the node iterator to initialize it to the
44 The <tt>operator++</tt> is used to step to the next node. After the last
45 node the iterator becomes invalid (i.e. it is set to \c INVALID).
46 This is what we exploit in the stop condition.
47 We iterate through all arcs of the digraph very similarly and print the
48 IDs of their source (tail) and target (head) nodes using the \c source()
49 and \c target() member functions.
51 After that we create an arc map, which is actually a mapping that assigns
52 an \c int value (length) to each arc, and we set this value for each arc.
53 Finally we iterate through all arcs again and print their lengths.
55 Now let's compile this simple example program.
57 \subsection hello_lemon_system If LEMON is Installed System-Wide
59 If your installation of LEMON into directory \c /usr/local was
60 successful, then it is very easy to compile this program with the
61 following command (the argument <tt>-lemon</tt> tells the compiler
62 that we are using the installed LEMON):
65 g++ hello_lemon.cc -o hello_lemon -lemon
68 As a result you will get the exacutable \c hello_lemon in the current
69 directory, which you can run by the following command.
75 \subsection hello_lemon_user If LEMON is Installed User-Local
77 Compiling the code is a bit more difficult if you installed LEMON
78 user-local into a directory (e.g. <tt>~/lemon</tt>) or if you just
79 skipped the step <tt>make install</tt>.
80 You have to issue a command like this.
83 g++ -I ~/lemon hello_lemon.cc -o hello_lemon -lemon -L ~/lemon/lemon/.libs
86 \subsubsection hello_lemon_pkg_config Use pkg-config
88 \todo Write this sub-subsection (\ref hello_lemon_pkg_config).
90 If everything has gone well, then our program prints out the followings.
94 This is LEMON library here. We have a direceted graph.
97 Arcs: (2,3) (1,3) (1,2) (0,2) (0,1)
99 There is a map on the arcs (length):
108 You may note that iterating through the nodes and arcs is done in the
109 reverse order compared to the creating order (the IDs are in decreasing
111 This is due to implementation aspects, that may differ at other graph
112 types, moreover it may be changed in the next releases.
113 Thus you should not exploit this method in any way, you should not
114 suppose anything about the iteration order.
116 If you managed to compile and run this example code without any problems,
117 you can go on reading this tutorial to get to know more features and tools
119 Otherwise if you encountered problems that you did not manage to solve,
121 <a href="mailto:lemon-user@lemon.cs.elte.hu"><b>contact us</b></a>.