take two following classes and their constructors as samples: class One{ public: One(int a,int b):adad1(a),adad2(b){} private: int adad1; int adad2; }; class Two{ public: Two(int input[]){ for (int i=0;i<10;i++) araye[i]=input[i]; } private: int araye[10]; }; considering objects with static storage duration, I t...
When I create a std::vector of objects, the constructor of these objects is not always called. #include <iostream> #include <vector> using namespace std; struct C { int id; static int n; C() { id = n++; } // not called // C() { id = 3; } // ok, called }; int C::n = 0; int main() { vector<C> vc; vc.resize...
take following class and two object definitions: class Rect{ public: enum centimeter; enum meter; Rect(double len,double wid,enum centimeter){ length=(len/100); width=(wid/100); } Rect(int len,int wid,enum meter){ length=len; width=wid; } //rest of implementation private: double length;//in meters double ...
My problem is like this. I have a XMLUtility class public class XmlUtility { protected string FilePath; protected string XMLFileName; protected XmlDocument SettingsFile; public XmlUtility(string inFilePath, string inXMLFileName) { FilePath = inFilePath; XMLFil...
Possible Duplicate: initializing char arrays in a way similar to initializing string literals below is a sample of initializing a string literal in which a terminating null character is added at the end of string, necessarily: char reshte[]="sample string"; I wonder why can't we initialize an array of characters without ter...
The Wikipedia article about special member functions doesn't contain any reference to move constructors and move assignment operators. I would like to update the entry but I'm not sure what the 0x standard says. What are the rules regarding these two functions? Are they automatically generated by the compiler and if so when? Edit: I...
I have a class called Foo with a constructor that needs arguments, and a other class Bar with a Foo private variable class Foo { public: Foo(string); } class Bar { public: Bar() { this->foo = Foo("test") } private: Foo foo; } However, when I try to compile this, I get a compile error that t...
I'm making a very dumb mistake just wrapping a pointer to some new'ed memory in a simple class. class Matrix { public: Matrix(int w,int h) : width(w),height(h) { data = new unsigned char[width*height]; } ~Matrix() { delete data; } Matrix& Matrix::operator=(const Matrix&p) { ...
I am trying to understand how classes and functions work more. So i have written a class with 2 functions inside it. Then initiated the class with $fifaadmin = new FifaAdmin; When I try to call this class from another page i get the following error Call to a member function leagueToReplace() on a non-object What am i doing wron...
Hi, I was trying to solve a copy ctro qs given in lipman n not sure If i got it right. Since the class has pointers to itself it confused me a bit. Here is the code #include <iostream> #include <string> using namespace std; class BinStrTreeNode{ public: BinStrTreeNode(const string& val):_val(val){ _leftc...
Suppose I have a Java class with multiple constructors: class Base { Base(int arg1) {...}; Base(String arg2) {...}; Base(double arg3) {...}; } How can I extend it in Scala and still provide access to all three of Base's constructors? In Scala, a subclass can only call one of it's superclass's constructors. How can I work a...
In OpenGL, one often writes code like this: glPushMatrix(); // modify the current matrix and use it glPopMatrix(); Essentially, the state is changed, then some actions are performed that use the new state, and finally the state is restored. Now there are two problems here: It's easy to forget to restore the state. If the code in be...
class Base{ public: Base(int val):_id(val){}; int _id; }; class Derived : Base { public: Derived(int val):Base(_id+val){}; }; int main(){ Derived d(60); } why doesn't this give an error? Base class is still not constructed but I'm able to use '_id'? thanks ...
I have an helper class with some static functions. all the functions in the class requires a 'heavy' initialization function to run once ( like it was a constructor.. ). is there a good practice ? the only thing i thought of is calling 'init' function , and breaking it's flow if it already run once (using static $initialized var). pro...
I was trying following code in which I defined copy c'tor explicitly to solve aliasing problem. But code is giving runtime error. #include<iostream> #include<cstring> using namespace std; class word { public: word(const char *s) // No default c'tor { str=const_cast<char*>(s); cnt=strlen(s); } word(const ...
Let's say you start off with this stub: [<Serializable>] type Bounderizer = val mutable _boundRect : Rectangle new (boundRect : Rectangle) = { _boundRect = boundRect ; } new () = { _boundRect = Rectangle(0, 0, 1, 1); } new (info:SerializationInfo, context:StreamingContext) = { // to do } interface ISerializable with member...
Possible Duplicate: In Scala, how can I subclass a Java class with multiple constructors? Hello all clever people I'm currently having a little problem where I need to invoke different super methods based on which constructor I invoke. In short it is something like this: class HelpfulJList(model: ListModel) extends JList(mo...
I have a constructor attempting to initialize a field in a base class. The compiler complains. The field is protected, so derived classes should have access. //The base class: class BaseClass { public: BaseClass(std::string); BaseClass(const BaseClass& orig); virtual ~BaseClass(); const std::string GetData() const; ...
I'm coming from a C++ background to python I have been declaring member variables and setting them in a C++esqe way like so: class MyClass: my_member = [] def __init__(self,arg_my_member): self.my_member = arg_my_member Then I noticed in some open source code, that the initial declaration my_member = [] was completel...
I'd like to restrict the value of a number parameter in a constructor to within a certain range. I know the conventional way is to do something like the following: public class Foo { public int MaxAmount { get; } public int Amount { get; set; } public Foo(int amount) { if (amount > MaxAmount) { Amount = MaxAmou...