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Returns a true-valued Integral Constant if one or more elements in Sequence are identical to T.
#include <boost/mpl/contains.hpp>
| Parameter | Requirement | Description | 
|---|---|---|
| Sequence | Forward Sequence | A sequence to be examined. | 
| T | Any type | A type to search for. | 
For any Forward Sequence s and arbitrary type t:
typedef contains<s,t>::type r;
| Return type: | |
|---|---|
| Semantics: | Equivalent to typedef not_< is_same< find<s,t>::type , end<s>::type > >::type r; | 
Linear. At most size<s>::value comparisons for identity.
typedef vector<char,int,unsigned,long,unsigned long> types; BOOST_MPL_ASSERT_NOT(( contains<types,bool> ));