无法覆盖 CMemFile::GrowFile
我有一个从 CMemFile 派生的类，称为 TempMemFile。我需要但无法重写 TempMemFile 中的 Growfile 方法。
当我在派生类 (TempMemFile) 中手动编写 GrowFile 方法时，当我单击 TempMemFile > 时，它永远不会被调用，并且在类视图中。属性>重写Growfile，其他方法这里就不列出来了。事实上，只有 3 种方法被列为可重写的 Assert、Dump 和 Dump 方法。连载。 MSDN 明确指出该方法可以被重写。我错过了什么吗？
实施/声明
// TempMemFile.h
class CTempMemFile : public CMemFile
{
public:
CTempMemFile(void);
~CTempMemFile(void);
DWORD Begin(void);
private:
void GrowFile(SIZE_T dwNewLen); // override
};
// TempMemFile.cpp
CTempMemFile::CTempMemFile(void) : CMemFile
{
}
CTempMemFile::~TempMemFile(void)
{
}
void GrowFile(SIZE_T dwNewLen)
{
// This function is never called but CMemFile::Growfile always is verified on the callstack
}
I have a class derived from CMemFile called TempMemFile. I need to but can't override the Growfile method in TempMemFile.
When I hand write the GrowFile method in my derived class (TempMemFile) it is never called and in class view when I click on my TempMemFile > Properties > Overrides the Growfile and other methods are not listed here. In fact only 3 methods are listed as override-able Assert, Dump & Serialize. MSDN specifically states that this method can be overridden. Am I missing something?
Implementation / Declaration
// TempMemFile.h
class CTempMemFile : public CMemFile
{
public:
CTempMemFile(void);
~CTempMemFile(void);
DWORD Begin(void);
private:
void GrowFile(SIZE_T dwNewLen); // override
};
// TempMemFile.cpp
CTempMemFile::CTempMemFile(void) : CMemFile
{
}
CTempMemFile::~TempMemFile(void)
{
}
void GrowFile(SIZE_T dwNewLen)
{
// This function is never called but CMemFile::Growfile always is verified on the callstack
}
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评论（2）
还要确保您的重写方法的可见性与基类的声明相匹配：
不正确
应该是
public或protected（无论CMemFile::GrowFile） code> 将其声明为）。Also make sure that the visibility of your override method matches the declaration of the base class:
is incorrect
Should be
publicorprotected(whateverCMemFile::GrowFiledeclares it as).您的
GrowFile实现用于名为GrowFile的全局函数。您需要在实现前面使用CTempMemFile::。Your
GrowFileimplementation is for a global function calledGrowFile. You needCTempMemFile::in front of the implementation.