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add empty_featureset (returning feature_ptr()) implementation

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This commit is contained in:
artemp 2016-07-13 15:07:08 +01:00
parent abb4271bea
commit 132aa6654f
1 changed files with 15 additions and 0 deletions
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15
include/mapnik/featureset.hpp
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@ -41,8 +41,23 @@ struct MAPNIK_DECL Featureset : private util::noncopyable
virtual ~Featureset() {} virtual ~Featureset() {}
}; };
struct MAPNIK_DECL empty_featureset final : Featureset
{
feature_ptr next()
{
return feature_ptr();
}
~empty_featureset() {}
};
using featureset_ptr = std::shared_ptr<Featureset>; using featureset_ptr = std::shared_ptr<Featureset>;
inline featureset_ptr make_empty_featureset()
{
return std::make_shared<empty_featureset>();
}
} }
#endif // MAPNIK_FEATURESET_HPP #endif // MAPNIK_FEATURESET_HPP