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108 lines
2.6 KiB
C++
108 lines
2.6 KiB
C++
/*!
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@file
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@author Albert Semenov
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@date 08/2008
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@module
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*/
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/*
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This file is part of MyGUI.
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MyGUI is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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MyGUI is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with MyGUI. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __MYGUI_ENUMERATOR_H__
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#define __MYGUI_ENUMERATOR_H__
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#include <assert.h>
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namespace MyGUI
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{
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/** Class for comfortable using of vectors with small while loop
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instead iterators. Performance is same as with iterators.
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Enumerator usage
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@example Enumerator
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@code
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typedef std::vector<std::string> VectorString;
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typedef Enumerator<VectorString> EnumeratorVectorString;
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VectorString vec;
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vec.push_back("value");
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//EnumeratorVectorString enum_vec(vec.begin(), vec.end());
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EnumeratorVectorString enum_vec(vec);
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while (enum_vec.next())
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{
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std::string value = enum_vec.current();
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}
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typedef std::pair<std::string, std::string> PairString;
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typedef std::map<PairString> MapString;
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MapString map;
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map["key"] = "value";
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//EnumeratorMapString enum_map(map.begin(), map.end());
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EnumeratorMapString enum_map(map);
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while (enum_map.next())
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{
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std::string key = enum_map.current().first;
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std::string value = enum_map.current().second;
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}
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@endcode
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*/
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template<typename T>
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class Enumerator
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{
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private:
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Enumerator() { }
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public:
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explicit Enumerator(const T& _container) :
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m_first(true),
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m_current(_container.begin()),
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m_end(_container.end())
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{
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}
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Enumerator(typename T::const_iterator _first, typename T::const_iterator _end) :
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m_first(true),
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m_current(_first),
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m_end(_end)
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{
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}
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bool next()
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{
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if (m_current == m_end) return false;
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else if (m_first)
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{
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m_first = false;
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return true;
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}
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++ m_current;
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if (m_current == m_end) return false;
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return true;
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}
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typename T::const_reference operator->() const { assert(m_current != m_end); return (*m_current); }
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typename T::const_reference current() { assert(m_current != m_end); return (*m_current); }
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private:
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bool m_first;
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typename T::const_iterator m_current;
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typename T::const_iterator m_end;
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};
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} // namespace MyGUI
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#endif // __MYGUI_ENUMERATOR_H__
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