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/*
* This source file is part of MyGUI. For the latest info, see http://mygui.info/
* Distributed under the MIT License
* (See accompanying file COPYING.MIT or copy at http://opensource.org/licenses/MIT)
*/
#ifndef MYGUI_ENUMERATOR_H_
#define MYGUI_ENUMERATOR_H_
#include <assert.h>
namespace MyGUI
{
/** Class for comfortable using of vectors with small while loop
instead iterators. Performance is same as with iterators.
Enumerator usage
@example Enumerator
@code
typedef std::vector<std::string> VectorString;
typedef Enumerator<VectorString> EnumeratorVectorString;
VectorString vec;
vec.push_back("value");
//EnumeratorVectorString enum_vec(vec.begin(), vec.end());
EnumeratorVectorString enum_vec(vec);
while (enum_vec.next())
{
std::string value = enum_vec.current();
}
typedef std::pair<std::string, std::string> PairString;
typedef std::map<PairString> MapString;
MapString map;
map["key"] = "value";
//EnumeratorMapString enum_map(map.begin(), map.end());
EnumeratorMapString enum_map(map);
while (enum_map.next())
{
std::string key = enum_map.current().first;
std::string value = enum_map.current().second;
}
@endcode
*/
template<typename T>
class Enumerator
{
private:
Enumerator()
{
}
public:
explicit Enumerator(const T& _container) :
m_first(true),
m_current(_container.begin()),
m_end(_container.end())
{
}
Enumerator(typename T::const_iterator _first, typename T::const_iterator _end) :
m_first(true),
m_current(_first),
m_end(_end)
{
}
bool next()
{
if (m_current == m_end)
return false;
else if (m_first)
{
m_first = false;
return true;
}
++ m_current;
if (m_current == m_end)
return false;
return true;
}
typename T::const_reference operator->() const
{
assert(m_current != m_end);
return (*m_current);
}
typename T::const_reference current()
{
assert(m_current != m_end);
return (*m_current);
}
private:
bool m_first;
typename T::const_iterator m_current;
typename T::const_iterator m_end;
};
} // namespace MyGUI
#endif // MYGUI_ENUMERATOR_H_
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