如何在cpp文件中调用静态成员函数
我想知道是否可以在 cpp 文件中调用静态成员函数，如下所示：
Ah
class A
{
public:
A(){}
virtual ~A(){}
static void Initialize(){ g_pSomeType = new SomeType();}
private:
static SomeType* g_pSomeType;
};
A.cpp
#include "A.h"
SomeType* A::g_pSomeType = nullptr;
A::Initialize(); //here I get an error: "Initialize may not be redeclared outside of it's class"
是否可以执行这样的操作？这样我就能够初始化类的 .cpp 文件内的静态成员，以避免用户必须先调用initialize()？我想我可以找到一种方法来解决这个问题，但我很好奇是否有办法让它发挥作用。谢谢。
I'm wondering if I can call a static member function inside a cpp file like the following:
A.h
class A
{
public:
A(){}
virtual ~A(){}
static void Initialize(){ g_pSomeType = new SomeType();}
private:
static SomeType* g_pSomeType;
};
A.cpp
#include "A.h"
SomeType* A::g_pSomeType = nullptr;
A::Initialize(); //here I get an error: "Initialize may not be redeclared outside of it's class"
Is it possible to do something like this? So that I would be able to initialize the static members inside the .cpp file of the class, to avoid users from having to call initialize() first? I suppose I could find a way to work around this problem but I'm curious if there's a way to let this work. Thanks.
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您不能在函数体之外编写任何可执行代码。仅当您位于函数或方法内部时，才可以调用
A::Initialize()（或执行任何其他函数/方法调用）...编译器认为您再次声明
A::Initialize()而不是调用它。You cannot write any executable code outside a function body. You can only call
A::Initialize()(or do any other function/method call) only if you're inside a function or a method...The compiler thinks that you're declaring
A::Initialize()again rather than calling it.您可以从构造函数中调用
initialize()（也许之前没有调用过它）。You can call
initialize()from the constructor (perhaps if it has not been called before).