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Pointer to composite class data member - Part 2

由 |▌冷眼眸甩不掉的悲伤 提交于 2019-12-08 14:17:45
问题 In addition to my previous question C++: Pointer to composite class data member : Sorry for not having described my needs. It seems to me a bit complex to explain. But, as asked, please find below a brief description of my problem. I would like to create a parameter class that is automatically filled from an XML. To do that, I add each data member of that parameter class into a vector of pointers to members associated with their XML tag names. During the XML reading all the tag names are read

Issue with member variable of an activity when using back button

由 江枫思渺然 提交于 2019-12-08 10:06:39
问题 I've got an activity that shows some item from a list. When swiping from right to left the same activity is started with the next product and when swiping from left to right I start the same activity with the previous product. I get the product position from a global array using a member variable position that I decrement when going to previous product and increment when going to next product, and that I pass as an extra in the intent. The issue is that when pressing the back button, the

set properties of data class using reflection in constructor

由 淺唱寂寞╮ 提交于 2019-12-08 09:10:42
I have several data classes defined in a similar way to the below and am trying to decide whether to have a built-in constructor for each data class to populate the members, or use reflection only once in the calling method: public class reportData { public List<Deposits> Deposits; } public class Deposits { public Deposits(List<Dictionary<string, string>> LPQReq) { PropertyInfo[] properties = typeof(Deposits).GetProperties(); foreach (Dictionary<string, string> PQList in LPQReq) { foreach (KeyValuePair<string, string> kvp in PQList) { MemberInfo info = typeof(Deposits).GetField(kvp.Key) as

C++: Pointer to composite class data member

由 丶灬走出姿态 提交于 2019-12-08 09:06:43
问题 Is it possible to access a composite class data member with pointers to members ? The following code is not valid but demonstrate the need. For example: class A { public: float fA; }; class B { public: float fB; A a; }; void test() { // Use of member pointer to access B::fB member float B::*ptr = &B::fB; // -> OK B myB; myB.*ptr = 25.; // Use of member pointer to access B::a.fA member ??? float B::*ptr2 = &B::a.fA; // -> ERROR B myB.*ptr2 = 25.; } I've complete my question here : Pointer to

set properties of data class using reflection in constructor

由 六眼飞鱼酱① 提交于 2019-12-08 05:53:36
问题 I have several data classes defined in a similar way to the below and am trying to decide whether to have a built-in constructor for each data class to populate the members, or use reflection only once in the calling method: public class reportData { public List<Deposits> Deposits; } public class Deposits { public Deposits(List<Dictionary<string, string>> LPQReq) { PropertyInfo[] properties = typeof(Deposits).GetProperties(); foreach (Dictionary<string, string> PQList in LPQReq) { foreach

Usage of objects or pointers to objects as class members and memory allocation

由 痴心易碎 提交于 2019-12-08 02:50:24
问题 A similar question has been asked here: Class members that are objects - Pointers or not? C++ so I'll keep it brief. Say I have an object that contains three stl vectors. Is my thinking correct that if they are regular members of the class, the memory of them will be "together" for the whole object? e.g. my memory would look sth like 10 blocks vector A, 5 blocks vector B, and then 15 blocks vector C. Would then once I insert more objects into vector A so that the space runs out the whole

Defining private static class member

由 两盒软妹~` 提交于 2019-12-08 01:49:05
问题 class B { /* ... */ }; class A { public: A() { obj = NULL; } private: static B* obj; }; However this produces huge mass of linker errors that symbol obj is unresolved. What's the "correct" way to have such private static class member without these linker errors? 回答1: You need to define like this : this is in the header : class B { ... } class A { public: A() { obj = NULL; } private: static B* obj; } this is in the source B* A::obj = NULL; 回答2: You need to add B *A::obj = NULL; to one of your

Perfect forwarding to a member function of a data member?

由 可紊 提交于 2019-12-07 14:19:35
问题 Consider a class that has a private std::vector data member: class MyClass { private: std::vector<double> _data; public: template <class... Args> /* something */ insert(Args&&... args) /* something */ { return _data.insert(std::forward<Args>(args)...); } }; What is the correct syntax (using C++14 auto/variadic templates/forward...) to transfer a given function of _data to MyClass (for example insert here) and provide the same interface for the user? 回答1: The correct syntax is this: class

Inheritance of class members, mixed with templates

由 最后都变了- 提交于 2019-12-07 14:05:49
问题 in the code below, why does T2 give this error ‘m_t’ was not declared in this scope , while TB is fine ? And how can I have access to T1's members in T2 while still using templates ? // All good class TA { public: TA() {} protected: int m_t; }; class TB : public TA { public: TB() {} int get() { return m_t; } protected: }; // Error in T2 template<typename T> class T1 { public: T1() {} protected: int m_t; }; template<typename T> class T2 : public T1<T> { public: T2() {} int get() { return m_t;

How do I get a list of all the public variables I have in a Class? (C#)

由 冷暖自知 提交于 2019-12-07 11:50:46
问题 I have a class that has A LOT of public variables and I need to be able to get a list of them. Here's an example of my class: public class FeatList: MonoBehaviour { public static Feat Acrobatic = new Feat("Acrobatic", false, ""); public static Feat AgileManeuvers = new Feat("Agile Maneuvers", false, "" ); void Start(){}} Except there are about 100 more variables. Is there any possible way to get all these member variables in one manageable array? Or have I screwed myself over? 回答1: If by
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