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| author | Adrian Kummerlaender | 2015-01-31 12:04:34 +0100 |
|---|---|---|
| committer | Adrian Kummerlaender | 2015-01-31 12:04:34 +0100 |
| commit | a9ec2e4e13670c8084c6baae59d6f3631960e22c (patch) | |
| tree | 5d8b519fc516ac7d8c1baff594a8967b71202fdc /src | |
| parent | 6291f3ce10aa8ebffa895f21c4ccb91b7349c66a (diff) | |
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Implemented higher order `Find` list search operation
* added appropriate test case
* other queries in `query.h` may be redefined in terms of `Find`
Diffstat (limited to 'src')
| -rw-r--r-- | src/list/operation/higher/find.h | 30 | ||||
| -rw-r--r-- | src/list/operation/higher/query.h | 16 |
2 files changed, 38 insertions, 8 deletions
diff --git a/src/list/operation/higher/find.h b/src/list/operation/higher/find.h new file mode 100644 index 0000000..47b88ad --- /dev/null +++ b/src/list/operation/higher/find.h @@ -0,0 +1,30 @@ +#ifndef TYPEASVALUE_SRC_LIST_OPERATION_HIGHER_FIND_H_ +#define TYPEASVALUE_SRC_LIST_OPERATION_HIGHER_FIND_H_ + +#include "type.h" +#include "conditional/if.h" + +namespace tav { + +template < + template<typename> class Predicate, + typename Current +> +struct Find { + typedef If< + Predicate<Head<Current>>::type::value, + Head<Current>, + typename Find<Predicate, Tail<Current>>::type + > type; +}; + +template < + template<typename> class Predicate +> +struct Find<Predicate, void> { + typedef Boolean<false> type; +}; + +} + +#endif // TYPEASVALUE_SRC_LIST_OPERATION_HIGHER_FIND_H_ diff --git a/src/list/operation/higher/query.h b/src/list/operation/higher/query.h index 198ffa5..d2b8e76 100644 --- a/src/list/operation/higher/query.h +++ b/src/list/operation/higher/query.h @@ -9,41 +9,41 @@ namespace tav { template < - template<typename> class Function, + template<typename> class Predicate, typename List > using Any = Fold< Or, Boolean<false>, - typename Map<Function, List>::type + typename Map<Predicate, List>::type >; template < - template<typename> class Function, + template<typename> class Predicate, typename List > using All = Fold< And, Boolean<true>, - typename Map<Function, List>::type + typename Map<Predicate, List>::type >; template < - template<typename> class Function, + template<typename> class Predicate, typename List > using None = Not< - typename Any<Function, List>::type + typename Any<Predicate, List>::type >; template < - template<typename> class Function, + template<typename> class Predicate, typename List > using Count = Fold< Add, tav::Size<0>, - typename Map<Function, List>::type + typename Map<Predicate, List>::type >; } |