lemon/base.cc
author Peter Kovacs <kpeter@inf.elte.hu>
Fri, 03 Apr 2009 18:59:15 +0200
changeset 600 6ac5d9ae1d3d
parent 440 88ed40ad0d4f
permissions -rw-r--r--
Support real types + numerical stability fix in NS (#254)

- Real types are supported by appropriate inicialization.
- A feature of the XTI spanning tree structure is removed to ensure
numerical stability (could cause problems using integer types).
The node potentials are updated always on the lower subtree,
in order to prevent overflow problems.
The former method isn't notably faster during to our tests.
     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) 2003-2009
     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 Some basic non-inline functions and static global data.
    21 
    22 #include<lemon/tolerance.h>
    23 #include<lemon/core.h>
    24 namespace lemon {
    25 
    26   float Tolerance<float>::def_epsilon = static_cast<float>(1e-4);
    27   double Tolerance<double>::def_epsilon = 1e-10;
    28   long double Tolerance<long double>::def_epsilon = 1e-14;
    29 
    30 #ifndef LEMON_ONLY_TEMPLATES
    31   const Invalid INVALID = Invalid();
    32 #endif
    33 
    34 } //namespace lemon