structs: 
    One: 
        description: ""
        generate_comparison_operators: true
        fields: 
            one: int

    Two: 
        description: ""
        inline_chained_structs: true
        chained_structs: 
            One: OneStruct
        generate_comparison_operators: true
        fields: 
            two: int

class Two {
public:
...
    friend bool operator==(const Two& left, const Two& right) {
        return left._oneStruct == right._oneStruct && left._one == right._one && left._two == right._two;
    }
...
private:
    mongo::One _oneStruct;
    std::int32_t _two;
    bool _hasTwo : 1;
};