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Editing: unwind_type.hpp

// Copyright David Abrahams 2002.
// Distributed under 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)
#ifndef UNWIND_TYPE_DWA200222_HPP
# define UNWIND_TYPE_DWA200222_HPP

# include <boost/python/detail/cv_category.hpp>
# include <boost/python/detail/indirect_traits.hpp>
# include <boost/python/detail/type_traits.hpp>

namespace boost { namespace python { namespace detail {

#if (!defined(_MSC_VER) || _MSC_VER >= 1915)
// If forward declared, msvc6.5 does not recognize them as inline.
// However, as of msvc14.15 (_MSC_VER 1915/Visual Studio 15.8.0) name lookup is now consistent with other compilers.
// forward declaration, required (at least) by Tru64 cxx V6.5-042 and msvc14.15
template <class Generator, class U>
inline typename Generator::result_type
unwind_type(U const& p, Generator* = 0);

// forward declaration, required (at least) by Tru64 cxx V6.5-042 and msvc14.15
template <class Generator, class U>
inline typename Generator::result_type
unwind_type(boost::type*p = 0, Generator* = 0);
#endif

template <class Generator, class U>
inline typename Generator::result_type
unwind_type_cv(U* p, cv_unqualified, Generator* = 0)
{
 return Generator::execute(p);
}

template <class Generator, class U>
inline typename Generator::result_type
unwind_type_cv(U const* p, const_, Generator* = 0)
{
 return unwind_type(const_cast<U*>(p), (Generator*)0);
}

template <class Generator, class U>
inline typename Generator::result_type
unwind_type_cv(U volatile* p, volatile_, Generator* = 0)
{
 return unwind_type(const_cast<U*>(p), (Generator*)0);
}

template <class Generator, class U>
inline typename Generator::result_type
unwind_type_cv(U const volatile* p, const_volatile_, Generator* = 0)
{
 return unwind_type(const_cast<U*>(p), (Generator*)0);
}

template <class Generator, class U>
inline typename Generator::result_type
unwind_ptr_type(U* p, Generator* = 0)
{
 typedef typename cv_category::type tag;
 return unwind_type_cv<Generator>(p, tag());
}

template <bool is_ptr>
struct unwind_helper
{
 template <class Generator, class U>
 static typename Generator::result_type
 execute(U p, Generator* = 0)
 {
 return unwind_ptr_type(p, (Generator*)0);
 }
};

template <>
struct unwind_helper<false>
{
 template <class Generator, class U>
 static typename Generator::result_type
 execute(U& p, Generator* = 0)
 {
 return unwind_ptr_type(&p, (Generator*)0);
 }
};

template <class Generator, class U>
inline typename Generator::result_type
#if (!defined(_MSC_VER) || _MSC_VER >= 1915)
unwind_type(U const& p, Generator*)
#else
unwind_type(U const& p, Generator* = 0)
#endif
{
 return unwind_helper<is_pointer::value>::execute(p, (Generator*)0);
}

enum { direct_ = 0, pointer_ = 1, reference_ = 2, reference_to_pointer_ = 3 };
template <int indirection> struct unwind_helper2;

template <>
struct unwind_helper2<direct_>
{
 template <class Generator, class U>
 static typename Generator::result_type
 execute(U(*)(), Generator* = 0)
 {
 return unwind_ptr_type((U*)0, (Generator*)0);
 }
};

template <>
struct unwind_helper2<pointer_>
{
 template <class Generator, class U>
 static typename Generator::result_type
 execute(U*(*)(), Generator* = 0)
 {
 return unwind_ptr_type((U*)0, (Generator*)0);
 }
};

template <>
struct unwind_helper2<reference_>
{
 template <class Generator, class U>
 static typename Generator::result_type
 execute(U&(*)(), Generator* = 0)
 {
 return unwind_ptr_type((U*)0, (Generator*)0);
 }
};

template <>
struct unwind_helper2<reference_to_pointer_>
{
 template <class Generator, class U>
 static typename Generator::result_type
 execute(U&(*)(), Generator* = 0)
 {
 return unwind_ptr_type(U(0), (Generator*)0);
 }
};

// Call this one with both template parameters explicitly specified
// and no function arguments:
//
// return unwind_type<my_generator,T>();
//
// Doesn't work if T is an array type; we could handle that case, but
// why bother?
template <class Generator, class U>
inline typename Generator::result_type
#if (!defined(_MSC_VER) || _MSC_VER >= 1915)
unwind_type(boost::type*, Generator*)
#else
unwind_type(boost::type*p =0, Generator* =0)
#endif
{
 BOOST_STATIC_CONSTANT(int, indirection
 = (is_pointer::value ? pointer_ : 0)
 + (indirect_traits::is_reference_to_pointer::value
 ? reference_to_pointer_
 : is_lvalue_reference::value
 ? reference_
 : 0));

return unwind_helper2<indirection>::execute((U(*)())0,(Generator*)0);
}

}}} // namespace boost::python::detail

#endif // UNWIND_TYPE_DWA200222_HPP

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