【tmp post】about c++ std::function
2017-12-29
1 // see file functional: class function<_Res(_ArgTypes...)> 2 template<typename T> 3 class foo; 4 5 template<typename T1, typename T2> 6 class foo<T1(T2)> { 7 public: 8 T1 i1; 9 T2 i2; 10 };
https://stackoverflow.com/questions/2402579/function-pointer-to-member-function
https://stackoverflow.com/questions/12662891/passing-a-member-function-as-an-argument-in-c
example
1 #include <iostream> 2 #include <functional> 3 4 using namespace std; 5 6 class CLS 7 { 8 public: 9 int i_; 10 CLS(int i):i_(i) {} 11 void method(const string& id) { cout << i_ << ": " << id << endl; } 12 }; 13 14 typedef void (CLS::*FUNC_PTR)(const string&); 15 16 void foo(CLS& obj, FUNC_PTR method) 17 { 18 (obj.*method)("by function pointer"); 19 } 20 21 int main() 22 { 23 CLS cls0(0); 24 FUNC_PTR fp = &CLS::method; //err: &(CLS::method) 25 foo(cls0, fp); 26 27 //C++11 28 CLS cls1(1); 29 function<void(CLS*, const string&)> f = &CLS::method; 30 f(&cls1, "by std::function"); 31 32 return 0; 33 }
