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    public: | 
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        ForceFieldOptions() { | 
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          DefineOptionalParameter(MixingRule, "arthimatic"); | 
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          DefineOptionalParameter(MixingRule, "arithmetic"); | 
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        } | 
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        ForceFieldOptions(const ForceFieldOptions&); | 
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        ForceFieldOptions& operator = (const ForceFieldOptions&); | 
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        void validateOptions() { | 
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          CheckParameter(MixingRule, isEqualIgnoreCase(std::string("arthimatic")) ||  | 
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                 isEqualIgnoreCase(std::string("geometric")));  | 
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          CheckParameter(MixingRule, isEqualIgnoreCase(std::string("arithmetic")) || isEqualIgnoreCase(std::string("geometric"))); | 
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        } | 
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