| Front Page / Metafunctions / Arithmetic Operations / minus | 
template<
      typename T1
    , typename T2
    , typename T3 = unspecified
    ...
    , typename Tn = unspecified
    >
struct minus
{
    typedef unspecified type;
};
Returns the difference of its arguments.
#include <boost/mpl/minus.hpp> #include <boost/mpl/arithmetic.hpp>
| Parameter | Requirement | Description | 
|---|---|---|
| T1, T2,... Tn | Integral Constant | Operation's arguments. | 
[Note: The requirements listed in this specification are the ones imposed by the default implementation. See Numeric Metafunction concept for the details on how to provide an implementation for a user-defined numeric type that does not satisfy the Integral Constant requirements. — end note]
For any Integral Constants c1,c2,... cn:
typedef minus<c1,...cn>::type r;
| Return type: | |
|---|---|
| Semantics: | Equivalent to typedef integral_c< typeof(c1::value - c2::value) , ( c1::value - c2::value ) > c; typedef minus<c,c3,...cn>::type r; | 
typedef minus<c1,...cn> r;
| Return type: | |
|---|---|
| Semantics: | Equivalent to struct r : minus<c1,...cn>::type {}; | 
Amortized constant time.
typedef minus< int_<-10>, int_<3>, long_<1> >::type r; BOOST_MPL_ASSERT_RELATION( r::value, ==, -14 ); BOOST_MPL_ASSERT(( is_same< r::value_type, long > ));