source:
downloads/boost_1_34_1/libs/mpl/doc/src/refmanual/contains.rst
@
29
| Last change on this file since 29 was 29, checked in by landauf, 17 years ago | |
|---|---|
| File size: 1.7 KB | |
contains
Synopsis
template<
typename Sequence
, typename T
>
struct contains
{
typedef |unspecified| type;
};
Description
Returns a true-valued |Integral Constant| if one or more elements in Sequence are identical to T.
Header
#include <boost/mpl/contains.hpp>
Parameters
| Parameter | Requirement | Description |
|---|---|---|
| Sequence | |Forward Sequence| | A sequence to be examined. |
| T | Any type | A type to search for. |
Expression semantics
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;
|
Complexity
Linear. At most size<s>::value comparisons for identity.
Example
typedef vector<char,int,unsigned,long,unsigned long> types; BOOST_MPL_ASSERT_NOT(( contains<types,bool> ));
See also
|Querying Algorithms|, |find|, |find_if|, |count|, |lower_bound|
Note: See TracBrowser
for help on using the repository browser.
