NullValue.h

 
#ifndef ACTIVE_SETTING_NULL_VALUE
#define ACTIVE_SETTING_NULL_VALUE
 
#include "Active/Setting/Values/Value.h"
 
namespace active::setting {
    
    class NullValue : public Value {
    public:
        
        NullValue() {}
 
        virtual Value* clonePtr() const override { return new NullValue(); }
 
        // MARK: - Operators
        
        virtual bool operator==(const Value& ref) const override { return ref.isNull(); }
        virtual bool operator<(const Value& ref) const override { return !ref.isNull(); }   //Null is less than anything except another null
        virtual Value& operator=(const Value& val) override { return *this; }
        virtual Value& operator=(bool val) override { return *this; }
        virtual Value& operator=(int32_t val) override { return *this; }
        virtual Value& operator=(uint32_t val) override { return *this; }
        virtual Value& operator=(int64_t val) override { return *this; }
        virtual Value& operator=(double val) override { return *this; }
        virtual Value& operator=(const active::utility::String& val) override { return *this; }
        virtual Value& operator=(const active::utility::Guid& val) override { return *this; }
        virtual Value& operator=(const active::utility::Time& val) override { return *this; }
        
        // MARK: - Conversion operators
 
        virtual operator bool() const override { return false; }
        virtual operator int32_t() const override { return 0; }
        virtual operator uint32_t() const override { return 0; }
        virtual operator int64_t() const override { return 0; }
        virtual operator double() const override { return 0.0; }
        virtual operator active::utility::String() const override { return utility::String(); }
        virtual operator active::utility::Guid() const override { return utility::Guid(); }
        virtual operator active::utility::Time() const override  { return utility::Time(); }
        
        // MARK: - Functions (const)
        
        virtual bool isNull() const override { return true; }
        virtual Type getType() const override { return null; }
        
        // MARK: - Functions (mutating)
        
        virtual void setDefault() override {}
    };
    
}
 
#endif  //ACTIVE_SETTING_NULL_VALUE