無法訪問基類領域

我創建了一個基類，像這樣：無法訪問基類領域

#include <cstdint> 
#include <iterator> 
#include <cstdint> 
#include <vector> 
#include <initializer_list> 

class PSBaseObject 
{ 
    protected: 
     inline std::int32_t* size_ptr(void* Data) { return reinterpret_cast<std::int32_t*>(Data) - 1; } 
     inline const std::int32_t* size_ptr(void* Data) const { return reinterpret_cast<std::int32_t*>(Data) - 1; } 

    public: 
     PSBaseObject() {} 
     virtual ~PSBaseObject() {} 
}; 

template<typename T> 
class PSObject : public PSBaseObject 
{ 
    protected: 
     T Data; 
     inline std::int32_t* size_ptr() { return reinterpret_cast<std::int32_t*>(&Data[0]) - 1; } 
     inline const std::int32_t* size_ptr() const { return reinterpret_cast<std::int32_t*>(&Data[0]) - 1; } 

    public: 
     PSObject() { *size_ptr(&Data[0]) = 0; *(size_ptr(&Data[0]) - 1) = -1; } 
     virtual ~PSObject() {} 
};

然後我從PSObject（不PSBaseObject）繼承這樣的：

template<typename T> 
class PSArray : public PSObject<std::vector<T, CustomAllocator<T>>> 
{ 
    private: 
     typedef std::vector<T, CustomAllocator<T>> underlying_type; 

    public: 
     typedef std::size_t             size_type; 
     typedef std::ptrdiff_t            difference_type; 
     typedef T*               pointer; 
     typedef const T*             const_pointer; 
     typedef T&               reference; 
     typedef const T&             const_reference; 
     typedef T               value_type; 
     typedef typename underlying_type::iterator       iterator; 
     typedef typename underlying_type::iterator::const_iterator   const_iterator; 
     typedef std::reverse_iterator<const_iterator>      const_reverse_iterator; 
     typedef std::reverse_iterator<iterator>        reverse_iterator; 

     explicit PSArray() : Data(CustomAllocator<T>()) { *size_ptr() = 0; } 
     explicit PSArray(size_type size) : Data(size, CustomAllocator<T>()) { *size_ptr() = size - 1; } 
     explicit PSArray(size_type size, const T &value) : Data(size, std::forward<decltype(value)>(value), CustomAllocator<T>()) { *size_ptr() = size - 1; } 
}; 


int main() 
{ 
}

，它告訴我：

error: class ‘PSArray<T>’ does not have any field named ‘Data’

爲什麼沒有看到「Data」f從它的基類中獲得？還有一種方法可以將我的typedefs移動到基類，並讓子類仍然能夠看到它們？

來源

2014-02-18 Brandon

嘗試在構造函數定義中添加相同內容，而不是在inisialization列表中。 http://stackoverflow.com/questions/2290733/initialize-parents-protected-members-with-initialization-list-c – sajas

您無法在派生類中初始化基類的Data字段;您需要提供一個構造函數來獲取類型爲T的對象，然後基類構造函數可以使用該值初始化Data。

來源

2014-02-18 04:40:38 jia103

無法訪問基類領域

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