rounding</a> and <a
href="checking.htm">checking</a> behaviors of the newly constructed class.
This second argument is not mandatory but may need some customizations. In
order to ease the manipulations, some helper templates are provided in
<code>interval/policies.hpp</code>.</p>
<pre>namespace boost {
namespace numeric {
namespace interval_lib {

template&lt;class Rounding, class Checking&gt;
struct policies {
  typedef Rounding rounding;
  typedef Checking checking;
};

template&lt;class OldInterval, clas