方法指针的静态数组
我面临一个我不明白的错误。
我尝试创建并使用方法指针的静态数组。我的类中的声明如下所示：
static void (Client::*packetHandler[Op::handledOpcodeMax - Op::handledOpcodeMin + 1])(QByteArray &data);
在我的 .cpp 文件中进行初始化是这样的：
void (Client::*packetHandler[Op::handledOpcodeMax - Op::handledOpcodeMin + 1])(QByteArray &data);
麻烦来了，在我的 Client 类方法之一中，我尝试使用此方法指针的数组。 我尝试了几种方法，例如：
(this->*packetHandler[_opcode])(data);
我说我不明白这个问题，让我解释一下原因。在我的代码上运行 make 会导致正确的编译，但链接时出现问题。
client.cpp:71: undefined reference to `Client::packetHandler'
此消息重复 5 次。
欢迎任何帮助。 谢谢。
I'm facing an error I dont understand.
I try to create and use a static array of method pointers. The declaration in my class looks like this:
static void (Client::*packetHandler[Op::handledOpcodeMax - Op::handledOpcodeMin + 1])(QByteArray &data);
Initialization takes place in my .cpp files is like that:
void (Client::*packetHandler[Op::handledOpcodeMax - Op::handledOpcodeMin + 1])(QByteArray &data);
Here comes the troubles, in one of my Client's class method I try to use this methods pointers' array.
I tried several ways, for example :
(this->*packetHandler[_opcode])(data);
I said I didnt understand the problem, let me explain why. Running make on my code results in a proper compilation, tought, there is a problem when linking.
client.cpp:71: undefined reference to `Client::packetHandler'
This message is repeated 5 times.
Any help would be welcome.
Thank you.
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void (Client::*packetHandler[Op::handledOpcodeMax - Op::handledOpcodeMin + 1])(QByteArray &data);声明一个名为packetHandler的全局变量。您想要定义类变量，它需要一个额外的Client::，如下所示：void (Client::*packetHandler[Op::handledOpcodeMax - Op::handledOpcodeMin + 1])(QByteArray &data);declares a global variable namedpacketHandler. You want to define your class variable, which needs an extraClient::like so:Client::*packetHandler是一个成员函数指针，它指向名为Client::packetHandler的成员函数。我不确定如何创建一个指向任意成员函数的成员函数指针，这似乎是您想要做的。我认为乔治是对的。您应该考虑使用诸如boost::function或std::tr1::function之类的东西，或者编写自己的成员函数包装类。Client::*packetHandleris a member function pointer that points to a member function namedClient::packetHandler. I'm not sure how to make a member function pointer that points to an arbitrary member function which is what you seem to want to do. I think George is right. You should consider using something likeboost::functionorstd::tr1::functionor write your own member function wrapper class.