diff --git a/include/boost/numeric/ublas/storage.hpp b/include/boost/numeric/ublas/storage.hpp index 84f9b8c8..b8cd0127 100644 --- a/include/boost/numeric/ublas/storage.hpp +++ b/include/boost/numeric/ublas/storage.hpp @@ -1133,12 +1133,12 @@ namespace boost { namespace numeric { namespace ublas { // Composition BOOST_UBLAS_INLINE basic_slice compose (const basic_range &r) const { - BOOST_UBLAS_CHECK (start_ >= stride_ * r.start (), bad_index ()); + BOOST_UBLAS_CHECK (stride_ >=0 || start_ >= -stride_ * r.start(), bad_index ()); return basic_slice (start_ + stride_ * r.start (), stride_, r.size ()); } BOOST_UBLAS_INLINE basic_slice compose (const basic_slice &s) const { - BOOST_UBLAS_CHECK (start_ >= stride_ * s.start_, bad_index ()); + BOOST_UBLAS_CHECK (stride_ >=0 || start_ >= -stride_ * s.start_, bad_index ()); return basic_slice (start_ + stride_ * s.start_, stride_ * s.stride_, s.size_); }