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Fixed recursion in extract_value_type #34

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Fixed recursion in extract_value_type #34

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23 changes: 11 additions & 12 deletions include/boost/numeric/odeint/algebra/detail/extract_value_type.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,10 @@
#define BOOST_NUMERIC_ODEINT_ALGEBRA_DETAIL_EXTRACT_VALUE_TYPE_HPP_INCLUDED

#include <boost/utility.hpp>
#include <boost/mpl/identity.hpp>
#include <boost/mpl/if.hpp>
#include <boost/mpl/has_xxx.hpp>
#include <boost/type_traits/is_same.hpp>

BOOST_MPL_HAS_XXX_TRAIT_DEF(value_type)

Expand All @@ -28,24 +31,20 @@ namespace odeint {
namespace detail {

template< typename S , typename Enabler = void >
struct extract_value_type {};

// as long as value_types are defined we go down the value_type chain
// e.g. returning S::value_type::value_type::value_type

template< typename S >
struct extract_value_type<S , typename boost::disable_if< has_value_type<S> >::type >
struct extract_value_type
{
// no value_type defined, return S
typedef S type;
};

// as long as value_types are defined we go down the value_type chain
// e.g. returning S::value_type::value_type::value_type

template< typename S >
struct extract_value_type< S , typename boost::enable_if< has_value_type<S> >::type >
{
// go down the value_type
typedef typename extract_value_type< typename S::value_type >::type type;
};
: mpl::if_< is_same< S, typename S::value_type > ,
mpl::identity< S > , // cut the recursion if S and S::value_type are the same
extract_value_type< typename S::value_type > >::type
{};

} } } }

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