// Boost.Range library
//
//  Copyright Thorsten Ottosen 2003-2004. Use, modification and
//  distribution is subject to the Boost Software License, Version
//  1.0. (See accompanying file LICENSE_1_0.txt or copy at
//  http://www.boost.org/LICENSE_1_0.txt)
//
// For more information, see http://www.boost.org/libs/range/
//

#ifndef BOOST_RANGE_DETAIL_IMPLEMENTATION_HELP_HPP
#define BOOST_RANGE_DETAIL_IMPLEMENTATION_HELP_HPP

#include <boost/range/config.hpp>
#include <boost/range/detail/common.hpp>
#include <boost/type_traits/is_same.hpp>
#include <cstddef>
#include <string.h>

#ifndef BOOST_NO_CWCHAR
#include <wchar.h>
#endif

namespace boost {
namespace range_detail {
template <typename T>
inline void
boost_range_silence_warning( const T& ) { }

/////////////////////////////////////////////////////////////////////
// end() help
/////////////////////////////////////////////////////////////////////

inline const char*
str_end( const char* s, const char* )
{
    return s + strlen( s );
}

#ifndef BOOST_NO_CWCHAR
inline const wchar_t*
str_end( const wchar_t* s, const wchar_t* )
{
    return s + wcslen( s );
}
#else
inline const wchar_t*
str_end( const wchar_t* s, const wchar_t* )
{
    if ( s == 0 || s[0] == 0 )
    {
        return s;
    }

    while ( *++s != 0 )
        ;

    return s;
}
#endif

template< class Char >
inline Char*
str_end( Char* s )
{
    return const_cast<Char*>( str_end( s, s ) );
}

template< class T, std::size_t sz >
BOOST_CONSTEXPR inline T*
array_end( T BOOST_RANGE_ARRAY_REF()[sz] ) BOOST_NOEXCEPT
{
    return boost_range_array + sz;
}

template< class T, std::size_t sz >
BOOST_CONSTEXPR inline const T*
array_end( const T BOOST_RANGE_ARRAY_REF()[sz] ) BOOST_NOEXCEPT
{
    return boost_range_array + sz;
}

/////////////////////////////////////////////////////////////////////
// size() help
/////////////////////////////////////////////////////////////////////

template< class Char >
inline std::size_t
str_size( const Char* const& s )
{
    return str_end( s ) - s;
}

template< class T, std::size_t sz >
inline std::size_t
array_size( T BOOST_RANGE_ARRAY_REF()[sz] )
{
    boost_range_silence_warning( boost_range_array );
    return sz;
}

template< class T, std::size_t sz >
inline std::size_t
array_size( const T BOOST_RANGE_ARRAY_REF()[sz] )
{
    boost_range_silence_warning( boost_range_array );
    return sz;
}

inline bool
is_same_address(const void* l, const void* r)
{
    return l == r;
}

template<class T1, class T2>
inline bool
is_same_object(const T1& l, const T2& r)
{
    return range_detail::is_same_address(&l, &r);
}

} // namespace 'range_detail'

} // namespace 'boost'

#endif
