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fixes in element<> for BCB compilers, with help from Tobias Schwinger

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[SVN r25763]
This commit is contained in:
Joaquín M. López Muñoz
2004-10-18 06:03:18 +00:00
parent bc3d37ec2b
commit 34690282fe
1 changed files with 57 additions and 0 deletions
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57
include/boost/tuple/detail/tuple_basic.hpp
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@ -135,6 +135,8 @@ struct get_class<0> {
// Nth element ot T, first element is at index 0
// -------------------------------------------------------
#ifndef BOOST_NO_CV_SPECIALIZATIONS
template<int N, class T>
struct element
{
@ -156,14 +158,69 @@ private:
typedef typename T::tail_type Next;
typedef typename element<N-1, Next>::type unqualified_type;
public:
#if BOOST_WORKAROUND(__BORLANDC__,<0x600)
typedef const unqualified_type type;
#else
typedef typename boost::add_const<unqualified_type>::type type;
#endif
};
template<class T>
struct element<0,const T>
{
#if BOOST_WORKAROUND(__BORLANDC__,<0x600)
typedef const typename T::head_type type;
#else
typedef typename boost::add_const<typename T::head_type>::type type;
#endif
};
#else // def BOOST_NO_CV_SPECIALIZATIONS
namespace detail {
template<int N, class T, bool IsConst>
struct element_impl
{
private:
typedef typename T::tail_type Next;
public:
typedef typename element_impl<N-1, Next, IsConst>::type type;
};
template<int N, class T>
struct element_impl<N, T, true /* IsConst */>
{
private:
typedef typename T::tail_type Next;
public:
typedef const typename element_impl<N-1, Next, true>::type type;
};
template<class T>
struct element_impl<0, T, false /* IsConst */>
{
typedef typename T::head_type type;
};
template<class T>
struct element_impl<0, T, true /* IsConst */>
{
typedef const typename T::head_type type;
};
} // end of namespace detail
template<int N, class T>
struct element:
public detail::element_impl<N, T, ::boost::is_const<T>::value>
{
};
#endif
// -get function templates -----------------------------------------------
// Usage: get<N>(aTuple)