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empty.h

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00001 // -*- C++ -*-
00002 #ifndef WIBBLE_EMPTY_H
00003 #define WIBBLE_EMPTY_H
00004 
00005 /*
00006  * Degenerated container to hold a single value
00007  *
00008  * Copyright (C) 2006  Enrico Zini <enrico@debian.org>
00009  *
00010  * This library is free software; you can redistribute it and/or
00011  * modify it under the terms of the GNU Lesser General Public
00012  * License as published by the Free Software Foundation; either
00013  * version 2.1 of the License, or (at your option) any later version.
00014  *
00015  * This library is distributed in the hope that it will be useful,
00016  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00017  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00018  * Lesser General Public License for more details.
00019  *
00020  * You should have received a copy of the GNU Lesser General Public
00021  * License along with this library; if not, write to the Free Software
00022  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
00023  */
00024 
00025 #include <cstddef>
00026 #include <bits/stl_iterator_base_types.h>
00027 
00028 #include <cstddef>
00029 #include <bits/stl_iterator_base_types.h>
00030 
00031 namespace wibble {
00032 
00033 template<typename T>
00034 class Empty
00035 {
00036 public:
00037     typedef T value_type;
00038 
00039     class const_iterator : public std::iterator<std::forward_iterator_tag, const T, void, const T*, const T&>
00040     {
00041     public:
00042         const T& operator*() const { return *(T*)0; }
00043         const T* operator->() const { return 0; }
00044         const_iterator& operator++() { return *this; }
00045         bool operator==(const const_iterator&) const { return true; }
00046         bool operator!=(const const_iterator&) const { return false; }
00047     };
00048 
00049     class iterator : public std::iterator<std::forward_iterator_tag, T, void, T*, T&>
00050     {
00051     public:
00052         T& operator*() const { return *(T*)0; }
00053         T* operator->() const { return 0; }
00054         iterator& operator++() { return *this; }
00055         bool operator==(const iterator&) const { return true; }
00056         bool operator!=(const iterator&) const { return false; }
00057     };
00058 
00059     bool empty() const { return true; }
00060     size_t size() const { return 0; }
00061 
00062     iterator begin() { return iterator(); }
00063     iterator end() { return iterator(); }
00064     const_iterator begin() const { return const_iterator(); }
00065     const_iterator end() const { return const_iterator(); }
00066 };
00067 
00068 }
00069 
00070 // vim:set ts=4 sw=4:
00071 #endif

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