[Home]minus

Synopsis

template<
      typename T1
    , typaname T2
    , typaname T3 = integral_c<int,0>
    , ...
    , typaname Tn = integral_c<int,0>
    >
struct minus
{
    typedef unspecified type;
};

Description

Returns the difference of its arguments [1].

Definition

#include "boost/mpl/arithmetic/minus.hpp"

Parameters

 Parameter  Requirement  Description  
T1, T2, .., TnA model of Integral Constant

Expression semantics

 Expression  Expression type  Precondition  Semantics  Postcondition 
typedef minus<t1,t2,..,tn>::type diff;A model of Integral ConstantEquivalent to typedef integral_c<typeof(t1::value - t2::value .. - tn::value), t1::value - t2::value .. - tn::value > diff;

Complexity

Amortized constant time.

Example

typedef minus< integral_c<short,-1>, integral_c<long,10> >::type diff;
BOOST_STATIC_ASSERT(diff::value == -11));
BOOST_MPL_ASSERT_IS_SAME(diff::value_type, long);

Notes

[1] The minus metafunction can be (and is expected to be) specialized by user to work on user-defined types that do not satisfy the Integral Constant requirements. The requirements listed here are the ones imposed by the default implementation.

See also

Metafunctions, plus, divides, multiplies, modulus, negate


Table of Content | Reference
Last edited July 17, 2002 4:06 am