c++ - boost::bind 不适用于指针参数

Question

我有这个简单的程序。在这里，我尝试将成员函数与对象绑定(bind)，稍后使用成员函数调用所需的参数进行调用。当成员函数采用指向整数的指针时，gcc 无法编译。使用整数参数，程序将被编译。这是 boost::bind 的错误还是我遗漏了什么？

// Doesn't work with pointer
#include <iostream>
#include <boost/bind.hpp>
using namespace std;
using namespace boost;

struct X
{
  float f_;
    float& f(int *aa) {
      cout << *aa << endl;
      return f_;
    }
};

int main() {
    X x;

    x.f_=200.1;
    int j = 10;

    cout << bind(&X::f, ref(x), _1)(&j) << endl;    
}

---

ERROR:
member.cpp: In function ‘int main()’:
member.cpp:22: error: no match for call to ‘(boost::_bi::bind_t<float&,  boost::_mfi::mf1<float&, X, int*>, boost::_bi::list2<boost::reference_wrapper<X>, boost::arg<1> > >) (int*)’
/usr/include/boost/bind/bind_template.hpp:17: note: candidates are: typename boost::_bi::result_traits<R, F>::type boost::_bi::bind_t<R, F, L>::operator()() [with R = float&, F = boost::_mfi::mf1<float&, X, int*>, L = boost::_bi::list2<boost::reference_wrapper<X>, boost::arg<1> >]
/usr/include/boost/bind/bind_template.hpp:23: note:                 typename boost::_bi::result_traits<R, F>::type boost::_bi::bind_t<R, F, L>::operator()() const [with R = float&, F = boost::_mfi::mf1<float&, X, int*>, L = boost::_bi::list2<boost::reference_wrapper<X>, boost::arg<1> >]
/usr/include/boost/bind/bind_template.hpp:29: note:                 typename boost::_bi::result_traits<R, F>::type boost::_bi::bind_t<R, F, L>::operator()(A1&) [with A1 = int*, R = float&, F = boost::_mfi::mf1<float&, X, int*>, L = boost::_bi::list2<boost::reference_wrapper<X>, boost::arg<1> >]
/usr/include/boost/bind/bind_template.hpp:35: note:                 typename boost::_bi::result_traits<R, F>::type boost::_bi::bind_t<R, F, L>::operator()(A1&) const [with A1 = int*, R = float&, F = boost::_mfi::mf1<float&, X, int*>, L = boost::_bi::list2<boost::reference_wrapper<X>, boost::arg<1> >]

---

// Works fine
#include <iostream>
#include <boost/bind.hpp>
using namespace std;
using namespace boost;

struct X
{
  float f_;
    float& f(int aa) {
      cout << aa << endl;
      return f_;
    }
};

int main() {
    X x;

    x.f_=200.1;
    int j = 10;

    cout << bind(&X::f, ref(x), _1)(j) << endl; 
}

Answer 1

bind 的第一个参数应该是指向应用非静态方法的对象的指针:

cout << bind(&X::f, &x, _1)(&j) << endl;