[問題] template一問
開發平台(Platform): (Ex: VC++, GCC, Linux, ...)
VC++
問題(Question)：
請問各位
現在小弟遇到一個問題
請看以下
class Base
{
public: virtual void Run() = 0;
};
class D1 : public Base
{
public: void Run() { std::cout << "Run D1"; }
};
class D2 : public Base
{
public: void Run() { std::cout << "Run D2"; }
};
class D3 : public Base
{
public: void Run() { std::cout << "Run D3"; }
};
Base* Get( int iType )
{
switch( iType )
{
case 1:
return new D1;
break;
case 2:
return new D2;
break;
case 3:
return new D3;
break;
}
}
像這種東西在以後type增減的狀況下必須不斷對Get()做調整
請問有沒有什麼方法可以解決這種問題?
小弟有想到要用template的方式做
template< class T >
class DerivedCreator
{
public:
Base* Get()
{
return &m_DerivedObj;
}
T m_DerivedObj;
};
但原本的Base* Get(int iType)又該怎麼寫呢?
Base* Get( int iType )
{
// ????????????????????????
}
template的type有辦法在runtime中當做參數傳進去嗎?
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