boost::bind 实现原理, 手动实现一个
template<typename R, typename T, typename A1>
class hangj_call
{
public:
hangj_call(R (T::*f_)(A1), const T& u_):f(f_), u(u_){}
R operator()(A1 a1){ return (u.*f)(a1); }
private:
R (T::*f)(A1);
T u;
};
template<typename R, typename T, typename A1>
hangj_call<R, T, A1> hangj_bind(R (T::*f)(A1), const T& u)
{
return hangj_call<R, T, A1>(f, u);
}
#include <cstdio>
class X
{
public:
bool f(int a){
printf(" %d\n", a);
return true;
}
};
int main(int argc, char** argv)
{
X x;
auto func = hangj_bind(&X::f, x);
func(8);
return 0;
}
原理如此,其它形式的 bind 都类似
+V why_null 请备注:from博客园