...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
template< typename T1 , typename T2 > struct modulus { typedef unspecified type; };
Returns the modulus of its arguments [1].
#include "boost/mpl/modulus.hpp"
Parameter | Requirement | Description |
---|---|---|
T1, T2 | A model of Integral Constant |
Expression | Expression type | Precondition | Semantics | Postcondition |
---|---|---|---|---|
typedef modulus<t1,t2>::type mod; | A model of Integral Constant | t2::value != 0 | Equivalent to typedef integral_c<typeof(t1::value % t2::value), t1::value % t2::value> mod; |
Amortized constant time.
typedef modulus< integral_c<short,10>, integral_c<long,3> >::type mod; BOOST_STATIC_ASSERT(mod::value == 1)); BOOST_MPL_ASSERT_IS_SAME(mod::value_type, long);
[1] The modulus
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.
Metafunctions, divides
, multiplies
, plus
, minus
, negate