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我想把 Ref Eigen 类以使用自定义类。我有以下代码:

#include <iostream>
#include <eigen3/Eigen/Dense>

class Interface {
public:
    virtual ~Interface() {
    }
    virtual void customMethod() const = 0;
};

class MyVectorType: public Eigen::Matrix<double, 3, 1, Eigen::DontAlign>,
        public Interface {
public:
    MyVectorType(void) :
            Eigen::Matrix<double, 3, 1, Eigen::DontAlign>() {
    }
    typedef Eigen::Matrix<double, 3, 1, Eigen::DontAlign> Base;
    // This constructor allows you to construct MyVectorType from Eigen expressions
    template<typename OtherDerived>
    MyVectorType(const Eigen::MatrixBase<OtherDerived>& other) :
            Eigen::Matrix<double, 3, 1, Eigen::DontAlign>(other) {
    }
    // This method allows you to assign Eigen expressions to MyVectorType
    template<typename OtherDerived>
    MyVectorType & operator=(const Eigen::MatrixBase<OtherDerived>& other) {
        this->Base::operator=(other);
        return *this;
    }
    virtual void customMethod() const {
        std::cout << rows() << std::endl;
    }
};

template<typename T, int Options>
class MyRef: public Eigen::Ref<typename T::Base, Options, Eigen::Stride<0, 0> >,
        public Interface {
public:
    typedef Eigen::Ref<typename T::Base, Options, Eigen::Stride<0, 0> > Base;
    template<typename Derived>
    MyRef(Eigen::DenseBase<Derived>& expr) :
            Eigen::Ref<typename T::Base, Options, Eigen::Stride<0, 0> >(expr) {
    }
    virtual void customMethod() const {
        std::cout << rows() << std::endl; // <-----error
    }
    EIGEN_INHERIT_ASSIGNMENT_OPERATORS(MyRef)};

template<typename T, int Options>
class MyRef<const T, Options> : public Eigen::Ref<typename T::Base, Options,
        Eigen::Stride<0, 0> >, public Interface {
public:
    template<typename Derived>
    MyRef(const Eigen::DenseBase<Derived>& expr) :
            Eigen::Ref<typename T::Base, Options, Eigen::Stride<0, 0> >(expr) {
    }
    virtual void customMethod() const {
        std::cout << rows() << std::endl; // <-----error
    }
};

void init(MyRef<MyVectorType, Eigen::Unaligned> m) {
    m.customMethod();
}

int main() {
    Eigen::Matrix<double, Eigen::Dynamic, Eigen::Dynamic, Eigen::AutoAlign, 12,
            12> mm(3, 1);
    Eigen::Map<MyVectorType::Base> map(mm.data(), 3, 1);
    MyRef<MyVectorType, Eigen::Unaligned> ref(map);
    init(ref);
    std::cout << mm << std::endl;
    return 0;
}

以便调用自定义方法,如方法 init() ,之间必须使用相同的接口 MyVectorType 和 MyRef . 所以我想用 Interface 班级。

问题是:这个代码不能编译,因为我不能调用 rows() 里面 米雷夫 ,所以我不知道如何访问 肌电型 或中的基础数据 Ref 类来调用其他方法。

我尝试过 derived() 但不起作用。我看了源代码,但我不明白 裁判 可正常使用所有接口 DenseBase . 我想为我的自定义方法做同样的事情。

GCC错误:

../main.cpp:49:16: error: there are no arguments to ‘rows’ that depend on a template parameter, so a declaration of ‘rows’ must be available [-fpermissive]
   std::cout << rows() << std::endl;
                ^~~~
../main.cpp:49:16: note: (if you use ‘-fpermissive’, G++ will accept your code, but allowing the use of an undeclared name is deprecated)
../main.cpp: In member function ‘virtual void MyRef<const T, Options>::customMethod() const’:
../main.cpp:63:16: error: there are no arguments to ‘rows’ that depend on a template parameter, so a declaration of ‘rows’ must be available [-fpermissive]
   std::cout << rows() << std::endl;
                ^~~~