.. Metafunctions/Arithmetic Operations//plus |10

plus

Synopsis

.. parsed-literal::

template<
      typename T1
    , typename T2
    , typename T3 = |unspecified|
    |...|
    , typename T\ *n* = |unspecified|
    >
struct plus
{
    typedef |unspecified| type;
};

Description

Returns the sum of its arguments.

Header

.. parsed-literal::

#include <boost/mpl/plus.hpp>
#include <boost/mpl/arithmetic.hpp>

Model of

|Numeric Metafunction|

Parameters

+---------------+---------------------------+-----------------------------------------------+ | Parameter | Requirement | Description | +===============+===========================+===============================================+ | |T1...Tn| | |Integral Constant| | Operation's arguments. | +---------------+---------------------------+-----------------------------------------------+

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

Expression semantics

For any |Integral Constant|\ s |c1...cn|:

.. parsed-literal::

typedef plus<c1,\ |...|\ c\ *n*\>::type r; 

:Return type: |Integral Constant|.

:Semantics: Equivalent to

.. parsed-literal::

    typedef integral_c<
          typeof(c1::value + c2::value)
        , ( c1::value + c2::value )
        > c;
        
    typedef plus<c,c3,\ |...|\c\ *n*\>::type r; 

.. ..........................................................................

.. parsed-literal::

typedef plus<c1,\ |...|\ c\ *n*\> r;

:Return type: |Integral Constant|.

:Semantics: Equivalent to

.. parsed-literal::

    struct r : plus<c1,\ |...|\ c\ *n*\>::type {};

Complexity

Amortized constant time.

Example

.. parsed-literal::

typedef plus< int_<-10>, int_<3>, long_<1> >::type r;
BOOST_MPL_ASSERT_RELATION( r::value, ==, -6 );
BOOST_MPL_ASSERT(( is_same< r::value_type, long > ));

See also

|Arithmetic Operations|, |Numeric Metafunction|, |numeric_cast|, |minus|, |negate|, |times|

.. 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)