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53 lines
1.2 KiB
C++
53 lines
1.2 KiB
C++
#pragma once
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#include <cstdint>
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namespace search
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{
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class CBV;
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// A lightweight filter of features.
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//
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// NOTE: this class and its subclasses *ARE* thread-safe.
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class FeaturesFilter
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{
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public:
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FeaturesFilter(CBV const & filter, uint64_t threshold);
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virtual ~FeaturesFilter() = default;
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bool NeedToFilter(CBV const & features) const;
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virtual CBV Filter(CBV const & cbv) const = 0;
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protected:
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CBV const & m_filter;
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uint64_t const m_threshold;
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};
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// Exact filter - leaves only features belonging to the set it was
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// constructed from.
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class LocalityFilter : public FeaturesFilter
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{
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public:
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LocalityFilter(CBV const & filter);
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// FeaturesFilter overrides:
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CBV Filter(CBV const & cbv) const override;
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};
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// Fuzzy filter - tries to leave only features belonging to the set it
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// was constructed from, but if the result is empty, leaves at most
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// first |threshold| features instead. This property is quite useful
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// when there are no matching features in viewport but it's ok to
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// process a limited number of features outside the viewport.
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class ViewportFilter : public FeaturesFilter
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{
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public:
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ViewportFilter(CBV const & filter, uint64_t threshold);
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// FeaturesFilter overrides:
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CBV Filter(CBV const & cbv) const override;
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};
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} // namespace search
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