00001 // Copyright (C) 2007, 2009 EPITA Research and Development Laboratory (LRDE) 00002 // 00003 // This file is part of Olena. 00004 // 00005 // Olena is free software: you can redistribute it and/or modify it under 00006 // the terms of the GNU General Public License as published by the Free 00007 // Software Foundation, version 2 of the License. 00008 // 00009 // Olena is distributed in the hope that it will be useful, 00010 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00011 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00012 // General Public License for more details. 00013 // 00014 // You should have received a copy of the GNU General Public License 00015 // along with Olena. If not, see <http://www.gnu.org/licenses/>. 00016 // 00017 // As a special exception, you may use this file as part of a free 00018 // software project without restriction. Specifically, if other files 00019 // instantiate templates or use macros or inline functions from this 00020 // file, or you compile this file and link it with other files to produce 00021 // an executable, this file does not by itself cause the resulting 00022 // executable to be covered by the GNU General Public License. This 00023 // exception does not however invalidate any other reasons why the 00024 // executable file might be covered by the GNU General Public License. 00025 00026 #ifndef MLN_MATH_SIGN_HH 00027 # define MLN_MATH_SIGN_HH 00028 00035 namespace mln 00036 { 00037 00038 namespace math 00039 { 00040 00041 enum sign_t 00042 { 00043 negative = -1, 00044 null = 0, 00045 positive = +1 00046 }; 00047 00048 00049 template <typename T> 00050 sign_t sign(const T& v); 00051 00052 00053 # ifndef MLN_INCLUDE_ONLY 00054 00055 template <typename T> 00056 inline 00057 sign_t sign(const T& v) 00058 { 00059 return v > 0 ? positive : (v < 0 ? negative : null); 00060 } 00061 00062 # endif // ! MLN_INCLUDE_ONLY 00063 00064 } // end of namespace mln::math 00065 00066 } // end of namespace mln 00067 00068 00069 #endif // ! MLN_MATH_SIGN_HH