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#ifndef UtilAlgos_CollectionFilterTrait_h
#define UtilAlgos_CollectionFilterTrait_h
/* \class CollectionFilterTrait<C, S, N>
*
* \author Luca Lista, INFN
*
*/
#include "CommonTools/UtilAlgos/interface/AnySelector.h"
#include "CommonTools/UtilAlgos/interface/MinNumberSelector.h"
namespace helper {
template <typename C, typename S, typename N>
struct CollectionFilter {
static bool filter(const C& source, const S& select, const N& sizeSelect) {
size_t n = 0;
for (typename C::const_iterator i = source.begin(); i != source.end(); ++i)
if (select(*i))
n++;
return sizeSelect(n);
}
};
template <typename C, typename S>
struct CollectionFilter<C, S, MinNumberSelector> {
static bool filter(const C& source, const S& select, const MinNumberSelector& sizeSelect) {
size_t n = 0;
for (typename C::const_iterator i = source.begin(); i != source.end(); ++i) {
if (select(*i))
n++;
if (sizeSelect(n))
return true;
}
return false;
}
};
template <typename C, typename N>
struct CollectionSizeFilter {
template <typename S>
static bool filter(const C& source, const S&, const N& sizeSelect) {
return sizeSelect(source.size());
}
};
template <typename C, typename S, typename N>
struct CollectionFilterTrait {
typedef CollectionFilter<C, S, N> type;
};
template <typename C, typename N>
struct CollectionFilterTrait<C, AnySelector, N> {
typedef CollectionSizeFilter<C, N> type;
};
} // namespace helper
#endif
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