全局函数指针数组typedef和成员函数指针数组类内外部typedef

#include <iostream>#include <vector>// 1.对全局函数指针数组typedeftypedef void(*FuncType01)();typedef FuncType01 Func01Array[2];void foo() {	std::cout << "void foo()" << std::endl;}void bar(){	std::cout << "void bar()" << std::endl;}class A {public:	// 2.在类中对成员函数指针数组typedef	typedef void (A::*FuncType02)() const;	typedef FuncType02 Func02Array[2];	void foo() const { std::cout << "void foo() const" << std::endl; }	void bar() const { std::cout << "void bar() const" << std::endl; }	void test() const	{		// 调用2的，类内部类型前不需要加类的域		FuncType02 f = &A::foo;// 取成员函数地址必须加&，无论是否在类的内部还是外部		Func02Array fs = {&A::foo, &A::bar};		(this->*f)();		for (int i = 0; i < 2; i++)		{			(this->*fs[i])();		}	}};// 3.在类外对成员函数指针数组typedeftypedef void (A::*FuncType03)() const;typedef FuncType03 Func03Array[2];int main(){	// 调用1的	FuncType01 f1 = ::foo;//&可以不加	Func01Array fs1 = { &foo, &bar };	(*f1)();	for (int i = 0; i < 2; i++)	{		(*fs1[i])();	}	// 调用2的	A::FuncType02 f2 = &A::foo;// 取成员函数地址必须加&	A::Func02Array fs2 = {&A::foo, &A::bar};	A a;	(a.*f2)();	for (int i = 0; i < 2; i++)	{			(a.*fs2[i])();	}	// 调用3的，不需要加类的域	FuncType03 f3 = &A::foo;	Func03Array fs3 = {&A::foo, &A::bar};	A a2;	(a2.*f3)();	for (int i = 0; i < 2; i++)	{			(a2.*fs3[i])();	}	a.test();	return 0;}