filter_parameter.h

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#ifndef MF_FLOW_FILTER_PARAMETER_H_
#define MF_FLOW_FILTER_PARAMETER_H_

#include "../common.h"
#include <functional>
#include <stdexcept>

namespace mf { namespace flow {

template<typename Value>
class filter_parameter {
public:
    using value_type = Value;
    using function_type = Value(time_unit t);

private:
    std::function<function_type> function_;

    filter_parameter(const filter_parameter&) = delete;
    filter_parameter& operator=(const filter_parameter&) = delete;
    
public:
    filter_parameter() = default;
    
    explicit filter_parameter(const Value& constant_value) {
        set_constant(constant_value);
    }
        
    bool is_defined() const noexcept { return !! function_; }
    
    value_type get(time_unit t) const {
        if(! is_defined()) throw std::runtime_error("node parameter is undefined");
        else return function_(t);
    }
    
    void set_constant(const Value& constant_value) {
        function_ = [constant_value](time_unit i) { return constant_value; };
    }
    
    template<typename Function>
    void set_time_function(Function&& func) {
        function_ = func;
    }
    
    void set_mirror(const filter_parameter& param) {
        set_time_function([&param](time_unit t) { return param.get(t); });
    }
    
    void unset() {
        function_ = nullptr;
    }
};

}}

#endif