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,然后使用成员函数调用中所需的参数进行调用。当成员函数采用指向 integer的指针时,gcc 无法编译。使用整数参数,程序被编译。这是 boost::bind 的错误还是我错过了什么?
// 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;
}