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Questions tagged [member-variables]

A member variable is a member of a type and belongs to that type's state. (Contrast with a "local variable", defined inside a method.)

169 questions
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Put a parenthesis after member variable to initialize?

I have seen people put a parenthesis after the member variable in the initialization list. I wonder why would people do that? For example, I have a STL container in header file: class A{ public: A(); ... private: vector…
HoKy22
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C++: Copy constructor: Use getters or access member vars directly?

I have a simple container class with a copy constructor. Do you recommend using getters and setters, or accessing the member variables directly? public Container { public: Container() {} Container(const Container& cont) //option…
cbrulak
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Inherited class initializing a custom made class using non-default constructor

So I have searched all over the place and I can not seem to find the answer to this specific question. I am using a winXP with cygwin and gcc 3.4.4 cygming special. Problem: I have a class that works as an interface with some abstract methods and…
tomasgudm
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C++ Class Member Variables Resetting After Loop?

After getting help on this question, I was led to do better debugging. In that process, I discovered that my problem is this: While working in C++, attempting to set a class' member variable to a value works, but not while looping. I have reduced my…
Gaffi
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C++ Object references as member variables of objects

I'm kinda new to C++ and I've run into a problem with setting up the main architecture. I learned how to use this specific architecture in C#, but I can't get it to work in C++. My problem is as follows: I have 2 objects. I want these objects to…
Maxim Schoemaker
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C++ Thread_local non-static member of class?

I'm trying to have one member variable of a class thread local. However it seems that thread_local in a class has to also be static..? But static would mean that all instances of that class share that variable. I want it so there can be different…
Alasdair
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Aren't class member varialbes as bad as global variable?

We all know the following code is bad because of the use of global variable: a = 3.14 def inc(): global a a += 1 inc() b = a It is so bad that in python one has to intentionally declare global to "break" the ban. But in the name of OO, how…
lunchbreak
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How do member variables work with specialized class templates?

I'm trying to write a very simple specialized class template that has a member variable and can print that member variable differently in specialized situations. I know the example is pretty useless, but it illustrates the question pretty well. When…
tjwrona1992
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how to declare a var of the type of a member var of some struct?

I want to get codes like this: struct Order_t { time_point order_time; // some other fileds }; template void onTimer( time_point tp_now ) { auto tp0 = …
Leon
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C++ state machine, inherited class with member values with incorrect syntax

I don't know if my question title makes sense, so apologies in advance for that. so... I'm trying to implement a state machine for a little game I'm trying to make using C++ and SFML. I have a GameLoopObject abstract class which needs a renderwindow…
Caedendi
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std::map of polymorphic member variables pointers

I'm working on implementing a map of member variables pointers associated with a string key. All variables range from a base class "BaseA" When accessing the variables from the map, it is only required to use the base class methods (getDesc () in…
SNJ
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C++ Initialize const class member variable in header file or in constructor?

I just wanted to ask what's the best practice for initializing const class member variables in C++, in the header file or in the constructor? Thanks : ) In the header file: .h file: class ExampleClass{ public: ExampleClass(); private: const…
JilReg
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mem_fn to function of member object

I was tinkering around with the std::mem_fn and couldn't manage to bind it to data/functions of an member of a struct (one layer deeper). I hope that the code shows the problem better than I can describe it, because I'm not familiar with the…
Thomas B.
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F# make member value based on member function

I have made a member function in a class. Afterwards I want to make a member value that is set to the result of this member function. type MyType() = member this.drawFilledPlanet(xCoord:int, yCoord:int, pWidth:int, pHeight:int, color) = let…
Nulle
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Referencing a pointer in a C++ member function

I'm writing a member function that uses a member variable pointer as an iterator. However I want to reference the pointer within the function purely for readability's sake. Like so: /* getNext will return a pos object each time it is called for each…
Rhys van der Waerden
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