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|
.. Metafunctions/Comparisons//greater |30
greater
=======
Synopsis
--------
.. parsed-literal::
template<
typename T1
, typename T2
>
struct greater
{
typedef |unspecified| type;
};
Description
-----------
Returns a true-valued |Integral Constant| if ``T1`` is greater than ``T2``.
Header
------
.. parsed-literal::
#include <boost/mpl/greater.hpp>
#include <boost/mpl/comparison.hpp>
Model of
--------
|Numeric Metafunction|
Parameters
----------
+---------------+---------------------------+-----------------------------------------------+
| Parameter | Requirement | Description |
+===============+===========================+===============================================+
| ``T1``, ``T2``| |Integral Constant| | Operation's arguments. |
+---------------+---------------------------+-----------------------------------------------+
|Note:| |numeric metafunction note| |-- end note|
Expression semantics
--------------------
For any |Integral Constant|\ s ``c1`` and ``c2``:
.. parsed-literal::
typedef greater<c1,c2>::type r;
:Return type:
|Integral Constant|.
:Semantics:
Equivalent to
.. parsed-literal::
typedef bool_< (c1::value < c2::value) > r;
.. ..........................................................................
.. parsed-literal::
typedef greater<c1,c2> r;
:Return type:
|Integral Constant|.
:Semantics:
Equivalent to
.. parsed-literal::
struct r : greater<c1,c2>::type {};
Complexity
----------
Amortized constant time.
Example
-------
.. parsed-literal::
BOOST_MPL_ASSERT(( greater< int_<10>, int_<0> > ));
BOOST_MPL_ASSERT_NOT(( greater< long_<0>, int_<10> > ));
BOOST_MPL_ASSERT_NOT(( greater< long_<10>, int_<10> > ));
See also
--------
|Comparisons|, |Numeric Metafunction|, |numeric_cast|, |greater_equal|, |less|, |equal_to|
.. copyright:: Copyright 2001-2009 Aleksey Gurtovoy and David Abrahams
Distributed under the Boost Software License, Version 1.0. (See accompanying
file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
