Visual Studio 2005 c ++继承错误的解决方法

Question

以下代码无法在Visual Studio 2005中编译:

class OriginalClass
{
public:
    class Delegate
    {
        virtual void original_func()=0;
    };
};

class BaseClass
    :public OriginalClass::Delegate //  Problem line 1
{
public:
    class Delegate
    {
        virtual void base_func(int x) = 0;
    };

    void original_func()override{}  //  Problem line 2
};

class DerivedClass : public BaseClass::Delegate
{
public:
    virtual void base_func(int x) override {};
};

int main ()
{
    DerivedClass derived_object;

    derived_object.base_func(10);
}

构建输出是:

1>inherit\main.cpp(26) : error C3668: 'DerivedClass::base_func' : method with override specifier 'override' did not override any base class methods
1>inherit\main.cpp(32) : error C2259: 'DerivedClass' : cannot instantiate abstract class
1>        due to following members:
1>        'void OriginalClass::Delegate::original_func(void)' : is abstract
1>        inherit\main.cpp(7) : see declaration of 'OriginalClass::Delegate::original_func'

如果我注释掉标记为问题第1行和问题第2行的行,则构建正常.因此,使用override不是问题,也不是从嵌套类继承.似乎很难确定哪个Delegate类是正确使用的类.

VC2008中不存在此问题.

有人可以为此建议解决方法吗？除了显而易见的:升级到现代编译器!

此外,如果有人能指出任何bug的文档(如果它是一个bug),我将不胜感激.

编辑: @Anonymous Coward建议使用typedef,如果OriginalClass更改为以下内容,它将编译:

class OriginalClass
{
public:
    class Delegate_t
    {
        virtual void original_func()=0;
    };
    typedef Delegate_t Delegate;
};

Answer 1

这似乎确实是一个名称解析问题。使用 typedef 时可以编译：

class OriginalClass {
    // class Delegate { ... };
    typedef Delegate delegate_t;
};

class BaseClass : public OriginalClass::delegate_t {
    // class Delegate { ... };
    typedef Delegate delegate_t;
};

class DerivedClass : public BaseClass::delegate_t {
    // ...
};