boost::itl::is_element_less
template<class LeftT , class RightT > boost::enable_if< is_intra_combinable< LeftT, RightT >, bool >::type is_element_less(const LeftT & left, const RightT & right);
Returns true, if left is lexicographically less than right. Intervals are interpreted as sequence of elements. Complexity: linear.
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