filter.hpp

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#ifndef filter_h
#define filter_h
#include <iostream>
#include <functional>
#include "value.hpp"
namespace fv {

class ObsFilter : public DerivedValue<bool>{
    private:
        Function<bool()>& filter_function;

        void update_value(){
            value = filter_function();
        }

    public:
        ObsFilter(const std::string& name, std::function<bool()> filter_function, const std::string& impl="")
          :DerivedValue<bool>(name),
           filter_function(GenFunction::register_function<bool()>("filter::"+name, filter_function, impl)){ }
};

ObsFilter* all(const std::vector<ObsFilter*>&& fs){
    if(fs.size() == 0){
        return nullptr;
    } else{
        std::stringstream ss;
        ss << fs[0]->get_name();
        for(size_t i=1; i<fs.size(); i++) ss << "AND" << fs[i]->get_name();
        return new ObsFilter(ss.str(), [fs](){
                return std::all_of(std::begin(fs), std::end(fs), [](ObsFilter* f){return f->get_value();});
        });
    }
}

ObsFilter* any(const std::vector<ObsFilter*>&& fs){
    if(fs.size() == 0){
        return nullptr;
    } else{
        std::stringstream ss;
        ss << fs[0]->get_name();
        for(size_t i=1; i<fs.size(); i++) ss << "OR" << fs[i]->get_name();
        return new ObsFilter(ss.str(), [fs](){
                return std::any_of(std::begin(fs), std::end(fs), [](ObsFilter* f){return f->get_value();});
        });
    }
}

ObsFilter* all(ObsFilter *f1, ObsFilter *f2){
    return all({f1, f2});
}

ObsFilter* any(ObsFilter *f1, ObsFilter *f2){
    return any({f1, f2});
}

}
#endif // filter_h