// xutility stl/clr header
// Copyright (c) Microsoft Corporation. All rights reserved.
#ifndef _CLI_XUTILITY_
 #define _CLI_XUTILITY_

#ifndef __cplusplus_cli
 #error STL/CLR can be used only in code compiled /clr, clr:pure, or /clr:safe
#endif /* __cplusplus_cli */

#if !defined _CRT_WINDOWS && !defined(UNDOCKED_WINDOWS_UCRT)
 #using <Microsoft.VisualC.STLCLR.dll>
#endif

#ifdef _M_CEE_SAFE
#else /* _M_CEE_SAFE */
 #include <cstddef>		// for ptrdiff_t, size_t
 #include <xutility>	// for iterator tags
#endif /* _M_CEE_SAFE */

#define _STLCLR_FIELD_ACCESS	internal
#define _STLCLR		Microsoft::VisualC::StlClr::

#define MAX_CONTAINER_SIZE	((int)((unsigned int)(-1) >> 1))

namespace cliext {
//
// TEMPLATE METAPROGRAMMING AIDS
//
//
// TEMPLATE VALUE CLASS is_handle
//
template<typename _Value_t>
	value class is_handle
	{	// identify non-handle type
public:
	static const bool value = false;
	};

template<typename _Value_t>
	value class is_handle<_Value_t^>
	{	// identify handle type
public:
	static const bool value = true;
	};

//
// TEMPLATE VALUE CLASS _Container_traits
//
template<typename _Cont_t>
	value class _Container_traits
	{	// define types associated with a container
public:
	typedef typename _Cont_t::generic_container generic_container;
	typedef typename _Cont_t::generic_container^ generic_container_handle;
	};

template<typename _Cont_t>
	value class _Container_traits<_Cont_t^>
	{	// define type associated with a container handle
public:
	typedef typename _Cont_t::generic_container generic_container;
	typedef typename _Cont_t::generic_container^ generic_container_handle;
	};

//
// TEMPLATE VALUE CLASS _Dehandle
//
template<typename _Value_t>
	value class _Dehandle
	{	// define non-handle type
public:
	typedef _Value_t type;
	};

template<typename _Value_t>
	value class _Dehandle<_Value_t^>
	{	// define type with handle removed
public:
	typedef _Value_t type;
	};

//
// TEMPLATE CLASS _Cont_make_value
//
template<typename _Value_t,
	bool _Is_ref>
	ref class _Cont_make_value
	{	// make a non-ref value
public:
	static _Value_t make_value(_Value_t% _Val)
		{	// just return value
		return (_Val);
		}

	static void unmake_value(_Value_t%)
		{	// just do nothing
		}
	};

template<typename _Value_t>
	ref class _Cont_make_value<_Value_t, true>
	{	// make a ref value
public:
	static _Value_t make_value(_Value_t% _Val)
		{	// return copy of value
		return (gcnew typename _Dehandle<_Value_t>::type(_Val));
		}

	static void unmake_value(_Value_t% _Val)
		{	// delete object designated by handle value
		delete _Val;
		}
	};

//
// TEMPLATE VALUE CLASS _Generic_type
//
template<typename _Value_t,
	bool isref = !is_handle<_Value_t>::value && __is_ref_class(_Value_t)>
	value class _Generic_type;

template<typename _Value_t>
	value class _Generic_type<_Value_t, false>
	{	// define a non-ref type
public:
	typedef _Value_t type;
	};

template<typename _Value_t>
	value class _Generic_type<_Value_t, true>
	{	// define a ref type
public:
	typedef _Value_t^ type;
	};

//
// TEMPLATE FUNCTION _Handle_alloc
//
template<typename Mycont> inline
	Mycont^ _Handle_alloc(Mycont^)
	{	// allocate a container, given its handle type
	return (gcnew Mycont);
	}

//
// TEMPLATE CLASS _Fix_handle
//
#define _FIX_HANDLE(to, from, val) \
	cliext::_Fix_handle<to, from>::_Cvt(from(val))

template<typename _To_t,
	typename _From_t>
	ref class _Fix_handle
	{	// add or remove handle as needed, default version
public:
	static _To_t _Cvt(_From_t _Val)
		{	// convert _Val
		return (_To_t(_Val));
		}
	};

template<typename _To_t,
	typename _From_t>
	ref class _Fix_handle<_To_t^, _From_t>
	{	// add or remove handle as needed, add version
public:
	static _To_t^ _Cvt(_From_t _Val)
		{	// convert _Val
		return (gcnew _To_t(_Val));
		}
	};

template<typename _To_t,
	typename _From_t>
	ref class _Fix_handle<_To_t, _From_t^>
	{	// add or remove handle as needed, remove version
public:
	static _To_t _Cvt(_From_t^ _Val)
		{	// convert _Val
		return (*_Val);
		}
	};

template<typename _To_t,
	typename _From_t>
	ref class _Fix_handle<_To_t^, _From_t^>
	{	// add or remove handle as needed, handles version
public:
	static _To_t^ _Cvt(_From_t^ _Val)
		{	// convert _Val
		return (_Val);
		}
	};

//
// ITERATOR TAGS
//
ref class input_iterator_tag
	{	// identifying tag for input iterators
public:
	typedef input_iterator_tag _Mytype_t;

	input_iterator_tag()
		{	// default constructor
		}

	input_iterator_tag(input_iterator_tag%)
		{	// copy constructor
		}
	};

ref class output_iterator_tag
	{	// identifying tag for output iterators
public:
	typedef output_iterator_tag _Mytype_t;

	output_iterator_tag()
		{	// default constructor
		}

	output_iterator_tag(output_iterator_tag%)
		{	// copy constructor
		}
	};

ref class forward_iterator_tag
	: public input_iterator_tag
	{	// identifying tag for forward iterators
public:
	typedef forward_iterator_tag _Mytype_t;

	forward_iterator_tag()
		{	// default constructor
		}

	forward_iterator_tag(forward_iterator_tag%)
		{	// copy constructor
		}
	};

ref class bidirectional_iterator_tag
	: public forward_iterator_tag
	{	// identifying tag for bidirectional iterators
public:
	typedef bidirectional_iterator_tag _Mytype_t;

	bidirectional_iterator_tag()
		{	// default constructor
		}

	bidirectional_iterator_tag(bidirectional_iterator_tag%)
		{	// copy constructor
		}
	};

ref class random_access_iterator_tag
	: public bidirectional_iterator_tag
	{	// identifying tag for random-access iterators
public:
	typedef random_access_iterator_tag _Mytype_t;

	random_access_iterator_tag()
		{	// default constructor
		}

	random_access_iterator_tag(random_access_iterator_tag%)
		{	// copy constructor
		}
	};

ref class _Int_iterator_tag
	{	// identifying tag for integer types, not an iterator
public:
	typedef _Int_iterator_tag _Mytype_t;

	_Int_iterator_tag()
		{	// default constructor
		}

	_Int_iterator_tag(_Int_iterator_tag%)
		{	// copy constructor
		}
	};

//
// REF CLASS _Map_iter_cat
//
template<typename _Cat>
	ref class _Map_iter_cat
	{	// map to argument
public:
	typedef _Cat iterator_category;
	};

#ifdef _M_CEE_SAFE
#else /* _M_CEE_SAFE */
template<>
	ref class _Map_iter_cat<std::input_iterator_tag>
	{	// map to managed tag
public:
	typedef input_iterator_tag iterator_category;
	};

template<>
	ref class _Map_iter_cat<std::output_iterator_tag>
	{	// map to managed tag
public:
	typedef output_iterator_tag iterator_category;
	};

template<>
	ref class _Map_iter_cat<std::forward_iterator_tag>
	{	// map to managed tag
public:
	typedef forward_iterator_tag iterator_category;
	};

template<>
	ref class _Map_iter_cat<std::bidirectional_iterator_tag>
	{	// map to managed tag
public:
	typedef bidirectional_iterator_tag iterator_category;
	};

template<>
	ref class _Map_iter_cat<std::random_access_iterator_tag>
	{	// map to managed tag
public:
	typedef random_access_iterator_tag iterator_category;
	};
#endif /* _M_CEE_SAFE */

//
// TEMPLATE CLASS iterator_traits
//
template<class _Iter_t>
	value class iterator_traits
	{	// get traits from iterator _Iter
public:
	typedef typename _Map_iter_cat<
		typename _Iter_t::iterator_category>::iterator_category
		iterator_category;
	typedef typename _Iter_t::value_type value_type;
	typedef typename _Iter_t::difference_type difference_type;
	typedef difference_type distance_type;	// retained
	typedef typename _Iter_t::pointer pointer;
	typedef typename _Iter_t::reference reference;
	};

template<typename _Iter_t>
	value class iterator_traits<_Iter_t^>
	{	// get traits from managed pointer
public:
	typedef typename _Iter_t::iterator_category iterator_category;
	typedef typename _Iter_t::value_type value_type;
	typedef typename _Iter_t::difference_type difference_type;
	typedef difference_type distance_type;	// retained
	typedef typename _Iter_t::pointer pointer;
	typedef typename _Iter_t::reference reference;
	};

#ifdef _M_CEE_SAFE
#else /* _M_CEE_SAFE */
template<class _Ty>
	value class iterator_traits<_Ty *>
	{	// get traits from pointer
public:
	typedef random_access_iterator_tag iterator_category;
	typedef _Ty value_type;
	typedef std::ptrdiff_t difference_type;
	typedef std::ptrdiff_t distance_type;	// retained
	typedef _Ty *pointer;
	typedef _Ty& reference;
	};

template<class _Ty>
	value class iterator_traits<const _Ty *>
	{	// get traits from const pointer
public:
	typedef random_access_iterator_tag iterator_category;
	typedef _Ty value_type;
	typedef std::ptrdiff_t difference_type;
	typedef std::ptrdiff_t distance_type;	// retained
	typedef const _Ty *pointer;
	typedef const _Ty& reference;
	};
#endif /* _M_CEE_SAFE */

//
// PARTIAL SPECIALIZATIONS OF iterator_traits
//
template<class _Ty>
	value class iterator_traits<
		_STLCLR Generic::IInputIterator<_Ty>>
	{	// get traits from generic interface
public:
	typedef input_iterator_tag iterator_category;
	typedef _Ty value_type;
	typedef int difference_type;
	typedef int distance_type;	// retained
	typedef typename _Ty% pointer;
	typedef typename _Ty% reference;
	};

template<class _Ty>
	value class iterator_traits<
		_STLCLR Generic::IOutputIterator<_Ty>>
	{	// get traits from generic interface
public:
	typedef output_iterator_tag iterator_category;
	typedef _Ty value_type;
	typedef int difference_type;
	typedef int distance_type;	// retained
	typedef typename _Ty% pointer;
	typedef typename _Ty% reference;
	};

template<class _Ty>
	value class iterator_traits<
		_STLCLR Generic::IForwardIterator<_Ty>>
	{	// get traits from generic interface
public:
	typedef forward_iterator_tag iterator_category;
	typedef _Ty value_type;
	typedef int difference_type;
	typedef int distance_type;	// retained
	typedef typename _Ty% pointer;
	typedef typename _Ty% reference;
	};

template<class _Ty>
	value class iterator_traits<
		_STLCLR Generic::IBidirectionalIterator<_Ty>>
	{	// get traits from generic interface
public:
	typedef bidirectional_iterator_tag iterator_category;
	typedef _Ty value_type;
	typedef int difference_type;
	typedef int distance_type;	// retained
	typedef typename _Ty% pointer;
	typedef typename _Ty% reference;
	};

template<class _Ty>
	value class iterator_traits<
		_STLCLR Generic::IRandomAccessIterator<_Ty>>
	{	// get traits from generic interface
public:
	typedef random_access_iterator_tag iterator_category;
	typedef _Ty value_type;
	typedef int difference_type;
	typedef int distance_type;	// retained
	typedef typename _Ty% pointer;
	typedef typename _Ty% reference;
	};

template<class _Ty>
	value class iterator_traits<
		_STLCLR Generic::ReverseBidirectionalIterator<_Ty>>
	{	// get traits from generic interface
public:
	typedef bidirectional_iterator_tag iterator_category;
	typedef _Ty value_type;
	typedef int difference_type;
	typedef int distance_type;	// retained
	typedef typename _Ty% pointer;
	typedef typename _Ty% reference;
	};

template<class _Ty>
	value class iterator_traits<
		_STLCLR Generic::ConstReverseBidirectionalIterator<_Ty>>
	{	// get traits from generic interface
public:
	typedef bidirectional_iterator_tag iterator_category;
	typedef _Ty value_type;
	typedef int difference_type;
	typedef int distance_type;	// retained
	typedef typename _Ty% pointer;
	typedef typename _Ty% reference;
	};

template<class _Ty>
	value class iterator_traits<
		_STLCLR Generic::ReverseRandomAccessIterator<_Ty>>
	{	// get traits from generic interface
public:
	typedef random_access_iterator_tag iterator_category;
	typedef _Ty value_type;
	typedef int difference_type;
	typedef int distance_type;	// retained
	typedef typename _Ty% pointer;
	typedef typename _Ty% reference;
	};

template<class _Ty>
	value class iterator_traits<
		_STLCLR Generic::ConstReverseRandomAccessIterator<_Ty>>
	{	// get traits from generic interface
public:
	typedef random_access_iterator_tag iterator_category;
	typedef _Ty value_type;
	typedef int difference_type;
	typedef int distance_type;	// retained
	typedef typename _Ty% pointer;
	typedef typename _Ty% reference;
	};

template<class _Ty>
	value class iterator_traits<
		_STLCLR Generic::ContainerBidirectionalIterator<_Ty>>
	{	// get traits from generic interface
public:
	typedef bidirectional_iterator_tag iterator_category;
	typedef _Ty value_type;
	typedef int difference_type;
	typedef int distance_type;	// retained
	typedef typename _Ty% pointer;
	typedef typename _Ty% reference;
	};

template<class _Ty>
	value class iterator_traits<
		_STLCLR Generic::ConstContainerBidirectionalIterator<_Ty>>
	{	// get traits from generic interface
public:
	typedef bidirectional_iterator_tag iterator_category;
	typedef _Ty value_type;
	typedef int difference_type;
	typedef int distance_type;	// retained
	typedef typename _Ty% pointer;
	typedef typename _Ty% reference;
	};

template<class _Ty>
	value class iterator_traits<
		_STLCLR Generic::ContainerRandomAccessIterator<_Ty>>
	{	// get traits from generic interface
public:
	typedef random_access_iterator_tag iterator_category;
	typedef _Ty value_type;
	typedef int difference_type;
	typedef int distance_type;	// retained
	typedef typename _Ty% pointer;
	typedef typename _Ty% reference;
	};

template<class _Ty>
	value class iterator_traits<
		_STLCLR Generic::ConstContainerRandomAccessIterator<_Ty>>
	{	// get traits from generic interface
public:
	typedef random_access_iterator_tag iterator_category;
	typedef _Ty value_type;
	typedef int difference_type;
	typedef int distance_type;	// retained
	typedef typename _Ty% pointer;
	typedef typename _Ty% reference;
	};

template<>
	value class iterator_traits<bool>
	{	// get traits from integer type
public:
	typedef _Int_iterator_tag iterator_category;
	};

template<>
	value class iterator_traits<char>
	{	// get traits from integer type
public:
	typedef _Int_iterator_tag iterator_category;
	};

template<>
	value class iterator_traits<signed char>
	{	// get traits from integer type
public:
	typedef _Int_iterator_tag iterator_category;
	};

template<>
	value class iterator_traits<unsigned char>
	{	// get traits from integer type
public:
	typedef _Int_iterator_tag iterator_category;
	};

template<>
	value class iterator_traits<wchar_t>
	{	// get traits from integer type
public:
	typedef _Int_iterator_tag iterator_category;
	};

template<>
	value class iterator_traits<short>
	{	// get traits from integer type
public:
	typedef _Int_iterator_tag iterator_category;
	};

template<>
	value class iterator_traits<unsigned short>
	{	// get traits from integer type
public:
	typedef _Int_iterator_tag iterator_category;
	};

template<>
	value class iterator_traits<int>
	{	// get traits from integer type
public:
	typedef _Int_iterator_tag iterator_category;
	};

template<>
	value class iterator_traits<unsigned int>
	{	// get traits from integer type
public:
	typedef _Int_iterator_tag iterator_category;
	};

template<>
	value class iterator_traits<long>
	{	// get traits from integer type
public:
	typedef _Int_iterator_tag iterator_category;
	};

template<>
	value class iterator_traits<unsigned long>
	{	// get traits from integer type
public:
	typedef _Int_iterator_tag iterator_category;
	};

template<>
	value class iterator_traits<__int64>
	{	// get traits from integer type
public:
	typedef _Int_iterator_tag iterator_category;
	};

template<>
	value class iterator_traits<unsigned __int64>
	{	// get traits from integer type
public:
	typedef _Int_iterator_tag iterator_category;
	};

//
// TEMPLATE FUNCTION _Iter_category
//
template<class _Iter_t> inline
	typename iterator_traits<_Iter_t>::iterator_category
		_Iter_category(_Iter_t)
	{	// return category from iterator argument
	typename iterator_traits<_Iter_t>::iterator_category _Cat;

	return (_Cat);
	}

//
// TEMPLATE FUNCTION advance
//
template<typename _InIt_t,
	typename _Diff_t> inline
	void _Iter_advance(_InIt_t% _Where, _Diff_t _Off,
		input_iterator_tag)
	{	// increment iterator by offset, input iterators
	for (; 0 < _Off; --_Off)
		++_Where;
	}

template<typename _BidIt_t,
	typename _Diff_t> inline
	void _Iter_advance(_BidIt_t% _Where, _Diff_t _Off,
		bidirectional_iterator_tag)
	{	// increment iterator by offset, bidirectional iterators
	for (; 0 < _Off; --_Off)
		++_Where;
	for (; _Off < 0; ++_Off)
		--_Where;
	}

template<typename _RanIt_t,
	typename _Diff_t> inline
	void _Iter_advance(_RanIt_t% _Where, _Diff_t _Off,
		random_access_iterator_tag)
	{	// increment iterator by offset, random-access iterators
	_Where += _Off;
	}

template<typename _InIt_t,
	typename _Diff_t> inline
	void advance(_InIt_t% _Where, _Diff_t _Off)
	{	// increment iterator by _Off, arbitrary iterators
	_Iter_advance(_Where, _Off, _Iter_category(_Where));
	}

//
// TEMPLATE FUNCTIONS distance and _Iter_distance
//
template<typename _InIt_t,
	typename _Diff_t> inline
	void _Iter_distance2(_InIt_t _First, _InIt_t _Last, _Diff_t% _Off,
		input_iterator_tag)
	{	// add to _Off distance between input iterators
	for (; _First != _Last; ++_First)
		++_Off;
	}

template<typename _RanIt_t,
	typename _Diff_t> inline
	void _Iter_distance2(_RanIt_t _First, _RanIt_t _Last, _Diff_t% _Off,
		random_access_iterator_tag)
	{	// add to _Off distance between random-access iterators
	_Off += (_Diff_t)(_Last - _First);
	}

template<typename _InIt_t> inline
	int distance(_InIt_t _First, _InIt_t _Last)
	{	// return distance between iterators
	int _Off = 0;

	_Iter_distance2(_First, _Last, _Off, _Iter_category(_First));
	return (_Off);
	}

template<typename _InIt_t,
	typename _Diff_t> inline
	void _Iter_distance(_InIt_t _First, _InIt_t _Last, _Diff_t% _Off)
	{	// add to _Off distance between iterators
	_Iter_distance2(_First, _Last, _Off, _Iter_category(_First));
	}
}	// namespace cliext
#endif // _CLI_XUTILITY_