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Front Page / Metafunctions / Comparisons / not_equal_to |
template< typename T1 , typename T2 > struct not_equal_to { typedef unspecified type; };
Returns a true-valued Integral Constant if T1 and T2 are not equal.
#include <boost/mpl/not_equal_to.hpp> #include <boost/mpl/comparison.hpp>
Parameter | Requirement | Description |
---|---|---|
T1, T2 | 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 and c2:
typedef not_equal_to<c1,c2>::type r;
Return type: | |
---|---|
Semantics: | Equivalent to typedef bool_< (c1::value != c2::value) > r; |
typedef not_equal_to<c1,c2> r;
Return type: | |
---|---|
Semantics: | Equivalent to struct r : not_equal_to<c1,c2>::type {}; |
Amortized constant time.
BOOST_MPL_ASSERT(( not_equal_to< int_<0>, int_<10> > )); BOOST_MPL_ASSERT(( not_equal_to< long_<10>, int_<0> > )); BOOST_MPL_ASSERT_NOT(( not_equal_to< long_<10>, int_<10> > ));