member

问题 I would like to pass a member function of an instantiated object to another function. Example code is below. I am open for any strategy that works, including calling functional() from another function inside memberfuncpointertestclass using something like lambda or std::bind. Please note that I did not understand most of the threads I found with google about lambda or std::bind, so please, if possible, keep it simple. Also note that my cluster does not have C++ 11 and I would like to keep

问题 I would like to do the following: I have two classes, A and B, and want to bind a function from A to a function from B so that whenever something calls the function in B, the function from A is called. So basically, this is the scenario: ( important A and B should be independent classes) This would be class A: class A { private: // some needed variables for "doStuff" public: void doStuff(int param1, float *param2); } This is class B class B { private: void callTheFunction(); public: void

问题 I'm working on some kind of simple reflection for c++ structs where i want to recursivly iterate over all member variables. The code below almost does what i want but my compiler complians: "recursive type or function dependency context too complex" coming form aggregate_arity<MemberType>::size() which is based on Orients aggregate_arity implementation. Example usage case: struct B { SPVStruct; var_t<float2_t, true> f4; }; struct A { SPVStruct; var_t<float2_t, true> f2; var_t<float3_t, true>

问题 I'm trying to count all patient's symptoms to calculate the certainty factor for the disease, but I'm just getting one symptom of each disease. Also the result shows some duplicates. The certainty factor is the number of patient's symptoms/the total of symptoms of the disease: start:- write('Enter the name of the patient: '), read(Patient), write('Enter the symptoms: '), read(Symptoms), write('\n'), countSint(Diseases, Symptoms , Patient). countSint(Diseases, Symptoms , Patient) :- findall

问题 I am writing a simple VM and I have a question on implementing object and structure member access. Since the begin address of a program is arbitrary on each run, and subsequently the address of each and every of its objects is arbitrary too. Thus the only way I can think of to access an object or its member object is by accessing an offset from the "base" pointer, which means there is an arithmetic operation needed to access anything in a program structure. My question is whether this is the

问题 Zaphoyd's broadcast_server.cpp looks like the perfect backbone for a websocket server that it can quickly accept and send messages & connections with a thread for the real action so not to interrupt the communications. https://github.com/zaphoyd/websocketpp/blob/experimental/examples/broadcast_server/broadcast_server.cpp His simple print_server.cpp example compiles easily; however, I'm getting a few compile errors with broadcast_server.cpp . root@server:~# g++ -O3 broadcast_server.cpp -I ~

问题 I ran into an interesting, yet extremely annoying, bug on Visual Studio, below is the simplest repro: (uncomment the #define will allow VS to build the code) #include <iostream> using namespace std; //#define BUILD_ON_VS class CC { public: template<typename T> struct Foo { template<T foo> void bar() { cout << "VC likes this!\n"; } #ifndef BUILD_ON_VS template<T foo> void bar1(); #endif }; Foo<int> m_foo; }; #ifndef BUILD_ON_VS template<typename T> template<T foo> void CC::Foo<T>::bar1() {

问题 I'm trying to memoize a member function of a class, but every time the member is called (by another member) it makes a whole new cache and 'memoized' function. member x.internal_dec_rates = let cache = new Dictionary< Basis*(DateTime option), float*float>() fun (basis:Basis) (tl:DateTime option) -> match cache.TryGetValue((basis,tl)) with | true, (sgl_mux, sgl_lps) -> (sgl_mux, sgl_lps) | _ -> let (sgl_mux, sgl_lps) = (* Bunch of stuff *) cache.Add((basis,tl),(sgl_mux,sgl_lps)) sgl_mux,sgl

问题 class A { private: class B { private: std::mutex mu; A* parent = NULL; public: B(A* const parent_ptr): parent(parent_ptr) {} B(const A::B & b_copy) { /* I thought I needed code here */ } }; public: B b = B(this); //...to make this copy instruction work. // (Copy constructor is deleted, need to declare a new one?) }; I have a class B that is basically a thread-safe task queue. It contains a deque , a mutex , and a condition_variable . It facilitates a consumer/producer relationship between any

问题 Say I have a class public class Employee { public string name = ""; public int age = 20; } now I want a function that can dynamically get the value of a specified member of Employee public class Util<T> { public static string GetValue(T obj, string member) { // how to write } } so that I can use it like Employee p1 = new Employee(); string a = Util<Employee>.GetValue(p1, "age"); // a should be "20" How to do it? like access member use obj["???"] in PHP 回答1: Reflection. Take a look here: