Synopsis

template<
      typename T1
    , typename T2
    >
struct less
{
    typedef |unspecified| type;
};

Description

Returns a true-valued |Integral Constant| if T1 is less than T2.

Header

#include <boost/mpl/less.hpp>
#include <boost/mpl/comparison.hpp>

Model of

|Numeric Metafunction|

Parameters

|Note:| |numeric metafunction note| |-- end note|

Expression semantics

For any |Integral Constant|s c1 and c2:

typedef less<c1,c2>::type r;

typedef bool_< (c1::value < c2::value) > r;

typedef less<c1,c2> r;

struct r : less<c1,c2>::type {};

Complexity

Amortized constant time.

Example

BOOST_MPL_ASSERT(( less< int_<0>, int_<10> > ));
BOOST_MPL_ASSERT_NOT(( less< long_<10>, int_<0> > ));
BOOST_MPL_ASSERT_NOT(( less< long_<10>, int_<10> > ));

See also

|Comparisons|, |Numeric Metafunction|, |numeric_cast|, |less_equal|, |greater|, |equal|