C ++函子模板

f

class A {
private:
   int (A::*f)(int);
   int foo(int x) { return x; }
   int bar(int x) { return x*2; }
public:
   explicit A(bool foo=true) { f = foo ? &A::foo : &A::bar; }
   int run(int x) { return (this->*f)(x); }
};

B

class B {
public:
   int foo(int) { return x*x; }
};

foo

int foo(int x) { return 0; }

A

B::foo

foo

int (A::*)(int)

int (B::*)(int)

int (*)(int)

A::f

std::

boost::

std::tr1

::function<int(int)>

bind