lemon/lp_base.cc
author Peter Kovacs <kpeter@inf.elte.hu>
Thu, 12 Nov 2009 23:30:45 +0100
changeset 809 22bb98ca0101
parent 459 ed54c0d13df0
child 877 141f9c0db4a3
permissions -rw-r--r--
Entirely rework CostScaling (#180)

- Use the new interface similarly to NetworkSimplex.
- Rework the implementation using an efficient internal structure
for handling the residual network. This improvement made the
code much faster.
- Handle GEQ supply type (LEQ is not supported).
- Handle infinite upper bounds.
- Handle negative costs (for arcs of finite upper bound).
- Traits class + named parameter for the LargeCost type used in
internal computations.
- Extend the documentation.
     1 /* -*- mode: C++; indent-tabs-mode: nil; -*-
     2  *
     3  * This file is a part of LEMON, a generic C++ optimization library.
     4  *
     5  * Copyright (C) 2003-2008
     6  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
     7  * (Egervary Research Group on Combinatorial Optimization, EGRES).
     8  *
     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.
    12  *
    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
    15  * purpose.
    16  *
    17  */
    18 
    19 ///\file
    20 ///\brief The implementation of the LP solver interface.
    21 
    22 #include <lemon/lp_base.h>
    23 namespace lemon {
    24 
    25   const LpBase::Value LpBase::INF =
    26     std::numeric_limits<LpBase::Value>::infinity();
    27   const LpBase::Value LpBase::NaN =
    28     std::numeric_limits<LpBase::Value>::quiet_NaN();
    29 
    30 } //namespace lemon