Standard Portable Library: src/Null.cpp Source File

00001 /*
00002  *   This file is part of the Standard Portable Library (SPL).
00003  *
00004  *   SPL is free software: you can redistribute it and/or modify
00005  *   it under the terms of the GNU General Public License as published by
00006  *   the Free Software Foundation, either version 3 of the License, or
00007  *   (at your option) any later version.
00008  *
00009  *   SPL 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
00012  *   GNU General Public License for more details.
00013  *
00014  *   You should have received a copy of the GNU General Public License
00015  *   along with SPL.  If not, see <http://www.gnu.org/licenses/>.
00016  */
00017 #include <spl/Null.h>
00018 
00019 Null Null::m_instance;
00020 
00021 Null::Null()
00022 {
00023 }
00024 
00025 Null::~Null()
00026 {
00027 }
00028 
00029 bool Null::Equals( const IComparable *a ) const
00030 {
00031         return NULL ==a || a->MajicNumber() == MajicNumber();
00032 }
00033 
00034 int Null::Compare( const IComparable *a ) const
00035 {
00036         return (NULL == a || a->MajicNumber() == MajicNumber()) ? 0 : -1;
00037 }
00038 
00039 bool Null::Equals( const IComparable& a ) const
00040 {
00041         return a.MajicNumber() == MajicNumber();
00042 }
00043 
00044 int Null::Compare( const IComparable& a ) const
00045 {
00046         return a.MajicNumber() == MajicNumber() ? 0 : -1;
00047 }
00048 
00049 int32 Null::MajicNumber() const
00050 {
00051         return NULL_MAJIC;
00052 }
00053 
00054 int32 Null::HashCode() const
00055 {
00056         return 0;
00057 }