如何更改有关C ++ Template类的代码以使其完成？ [英] How do I change the code about C++ Template class to make it through?

问题描述

//代码

//Code

using namespace std;

template <class VECTOR>
class ModelCalc
{

public:
    typedef VECTOR                   vector_type;
    typedef typename vector_type::value_type  value_type;

public:

    ModelCalc(const vector_type& xValues,
        const vector_type& distances,
        const value_type&   length
        );


    const vector_type& distances() const;

    const value_type& length() const;

private:

    vector_type m_xValues;
    vector_type m_distances;
    value_type  m_length;

};


template <class VECTOR>
ModelCalc<VECTOR>::ModelCalc(const vector_type& xValues,
                                       const vector_type& distances,
                                       const value_type& length
                                       ):
m_xValues(xValues),
m_distances(distances),
m_length(length)
{

};

template <class VECTOR>
const ModelCalc<VECTOR>::vector_type& ModelCalc<VECTOR>::distances() const
{
    return m_distances;
};

template <class VECTOR>
const ModelCalc<VECTOR>::value_type& ModelCalc<VECTOR>::length() const
{
    return m_length;
};

//编制报告

警告C4346：ModelCalc< vector> :: vector_type：

//compiling report
warning C4346: "ModelCalc<vector>::vector_type":

error C2143: syntax error : missing";"(in front of"&")
error C4430: 

推荐答案

你应该使用 typename 来获取 ModelCalc< vector> :: vector_type< / vector> ，因为这是不是类型。

You should use typename for ModelCalc<vector>::vector_type</vector>, since this is not a type.

template <class vector="">
const typename ModelCalc<vector>::vector_type& ModelCalc<vector>::distances() const
{
   return m_distances;
};

template <class vector="">
const typename ModelCalc<vector>::value_type& ModelCalc<vector>::length() const
{
   return m_length;
};</vector></vector></class></vector></vector></class>

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