filter.h

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#ifndef SENSESP_SRC_TRANSFORMS_FILTER_H_
#define SENSESP_SRC_TRANSFORMS_FILTER_H_
 
#include <functional>
 
#include "sensesp/transforms/transform.h"
 
namespace sensesp {
 
template <typename T>
class Filter : public Transform<T, T> {
 public:
  Filter(std::function<bool(const T&)> filter, String config_path = "")
      : Transform<T, T>(config_path), filter_{filter} {
    this->load();
  }
  virtual void set(const T& new_value) override {
    if (filter_(new_value)) {
      this->emit(new_value);
    }
  }
 
 private:
  std::function<bool(const T&)> filter_;
};
 
}  // namespace sensesp
 
#endif  // SENSESP_SRC_TRANSFORMS_FILTER_H_