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Tham khảo tài liệu 'handbooks professional java-c-scrip-sql part 95', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | public function1 R func Arg invoker_ new function_ptr_invoker R Arg func template typename T function1 R T func Arg T p invoker_ new member_ptr_invoker R Arg T func p template typename T function1 T t invoker_ new function_object_invoker R Arg T t R operator Arg arg return invoker_ arg function1 delete invoker_ As you can see the hard part here is to correctly define the deduction system that is needed in order to support function pointers class member functions and function objects. This is true regardless of the actual design that is used to implement a library with this kind of functionality. To conclude here is some sample code that we can use to test the solution. bool some_function const std string s std cout s This is really neat n return true class some_class public bool some_function const std string s std cout s This is also quite nice n return true class some_function_object public bool operator const std string s std cout s This should work too in a flexible solution n return true All of these are acceptable for our functionl class int main function1 bool const std string f1 some_function f1 std string Hello some_class s function1 bool const std string f2 some_class some_function s f2 std string Hello function1 bool const std string f3 boost bind some_class some_function s _1 f3 std string Hello some_function_object fso function1 bool const std string f4 fso f4 std string Hello It also works with function objects returned from binder libraries such as Boost.Bind and Boost.Lambda. Our class is a lot more simplistic than the ones found in Boost.Function but it should be sufficiently detailed to see the problems and the solutions involved when creating and using such a library. To know a little something about how a library is implemented is helpful for using it as effectively as possible. Function Summary Use Function when You need to store a callback function or function object You want to decouple function calls from the implementation for example .
