错误C2761成员函数重新声明不允许 [英] error C2761 member function redeclaration not allowed

问题描述

在为类编写专业化时遇到问题（错误C2761）。我的类如下：

 类打印{
 public：
 typedef class fontA; 
 typedef class fontB; 
 typedef class fontC; 
 typedef class fontD; 
 
 template< class T> 
 void startPrint（void）{return; }; 
 virtual bool isValidDoc（void）= 0; 
}; 
  

我有一个类 QuickPrint 打印 class：

  class QuickPrint：public Print {
 ... 
}; 
  

当我尝试为 startPrint 方法：

 模板< //< = C2716 error here here 
 void QuickPrint :: startPrint< fontA>（void）
 {
 /// implementation 
} 
 
模板<> //< = C2716 error here here 
 void QuickPrint :: startPrint< fontB>（void）
 {
 /// implementation 
} 
 
解决方案
     / div> 
 QuickPrint没有名为startPrint的模板成员函数，因此专业化QuickPrint :: startPrint是一个错误。如果你在QuickPrint中重复模板定义，那么专业化是可以的：
  class QuickPrint：public Print {
 template< class T> 
 void startPrint（void）{return; }; 
}; 
 
模板<> //< = C2716错误在这里
 void QuickPrint :: startPrint< Print :: fontA>（void）
 {
 /// implementation 
} 
  
但是如果这里的目标是能够以多态方式调用QuickPrint，无法将打印标记为虚拟。
 
I've encountered a problem(error C2761) while writing specializations for a class. My classes are as follows:
class Print{
public:
    typedef class fontA;
    typedef class fontB;
    typedef class fontC;
    typedef class fontD;

    template<class T>
    void startPrint(void) { return; };
    virtual bool isValidDoc(void) = 0;
};
I have a class QuickPrint which inherits the Print class:
class QuickPrint : public Print {
       ...
};
The error occurs when I try to write specializations for the startPrint method:
template<>        // <= C2716 error given here
void QuickPrint::startPrint<fontA>(void)
{
      /// implementation
}

template<>        // <= C2716 error given here
void QuickPrint::startPrint<fontB>(void)
{
     /// implementation
}
The error appears for the remaining specializations as well.
解决方案
QuickPrint does not have a template member function named startPrint, so specializing QuickPrint::startPrint is an error. If you repeat the template definition in QuickPrint the specializations are okay:
class QuickPrint : public Print {
   template<class T>
    void startPrint(void) { return; };
 };

template<>        // <= C2716 error given here
void QuickPrint::startPrint<Print::fontA>(void)
{
      /// implementation
}
But if the goal here is to be able to call into QuickPrint polymorphically, you're in trouble, because the template function in Print can't be marked virtual.

                        
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