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element<T>::type takes constness into consideration

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[SVN r17666]
This commit is contained in:
Jaakko Järvi
2003-02-26 23:10:55 +00:00
parent 496cc84960
commit 1972959fda
2 changed files with 18 additions and 1 deletions
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15
include/boost/tuple/detail/tuple_basic.hpp
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@ -153,6 +153,21 @@ struct element<0,T>
typedef typename T::head_type type;
};
template<int N, class T>
struct element<N, const T>
{
private:
typedef typename T::tail_type Next;
typedef typename element<N-1, Next>::type unqualified_type;
public:
typedef typename boost::add_const<unqualified_type>::type type;
};
template<class T>
struct element<0,const T>
{
typedef typename boost::add_const<typename T::head_type>::type type;
};
// -get function templates -----------------------------------------------
// Usage: get<N>(aTuple)