why constructor cannot be virtual Post: 302130036

9 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Constructor problem

Hi guys I am new to these forums but since I am taking a class at college I would appreciate any help that is possible for this program. My instructor said that when its complete the program should be able to store all 3 fields instead of just 1. public class Greeter2Test { public static...

2. Programming

how do you handle a constructor and destructor that fail

helo i m new in c++ on linux can u tell me with an simple example that how do you handle constructor and destructor that fail? Regards, Amit

3. Programming

Doubt regarding Copy Constructor and return value

Hi All, I have made the simple following program :- #include <string> #include <iostream> using namespace std; class A{ private: int val; public : A(){cout<<"In A()"<<endl;} A (const A& aa) { cout<<"In copy c'tor"<<endl; } }; A f(...

4. UNIX for Dummies Questions & Answers

Have to log out of a virtual terminal twice in order to exit virtual terminals

Not really a newbie, but I have a strange problem and I'm not sure how to further troubleshoot it. I have to log out of a virtual terminal by typing exit, then exit again as in: woodnt@toshiba-laptop ~ $ exit logout woodnt@toshiba-laptop ~ $ exit logout I DON'T have to do this when I'm...

5. Programming

c++ object constructor question

I have the following code class Param{ public: Param(int aa, int bb){ a=aa; b=bb; } int a,b; }; void function(Param); int main(){ function(2,3); return 0; }

6. Programming

Doubts on C++ copy constructor concept

Hi, If I run the following program class A { public: A() { cout << "default" << endl; } A(const A&) { cout << "copy" << endl; } }; A tmp; A fun() { return tmp; } A test() { A tmp; cout << &tmp << endl; return tmp; }

7. Solaris

Change hostID of Solaris 10 virtual/guest machine installed by Virtual Box 4.1.12 on Windows-XP host

Trying to set or modify the randomly set hostID of a Solaris 10 virtual/guest machine that I installed on a Windows-XP host machine (using Virtual Box 4.1.12). I was able to set/modify the hostname of the Solaris 10 virtual/guest machine during installation as well as via the Virtual Box...

8. Programming

Constructor?

I am learning about C++ and today am reading concepts for Constructor but it seems a bit difficult to grab it fully. Please anyone explain in simple words about Constructor?

9. UNIX for Beginners Questions & Answers

Providing virtual machine priority in kvm based virtual machines

Hi All, Is there any way I can prioritize my VMs when there is resource crunch in host machine so that some VMs will be allocated more vcpu, more memory than other VMs in kvm/qemu hypervisor based virtual machines? Lets say in my cloud environment my Ubuntu 16 compute hosts are running some...

LEARN ABOUT V7

statevars

statevars(3U)						    InterViews Reference Manual 					     statevars(3U)

NAME

       BrushVar, ColorVar, CompNameVar, FontVar, GravityVar, MagnifVar, ModifStatusVar, NameVar, PatternVar - state variable subject subclasses

SYNOPSIS

       #include <Unidraw/statevars.h>

DESCRIPTION

       Unidraw predefines several state variable subject subclasses: BrushVar, ColorVar, FontVar, and PatternVar store the graphics state informa-
       tion their names suggest; GravityVar records whether gravity is in effect; MagnifVar records the current viewer magnification; ModifStatus-
       Var  records  whether  state-modifying  operations  have been applied to a component being edited; NameVar stores a string of interest; and
       CompNameVar is a NameVar that stores a component and keeps track of its catalog name.  These variables represent state  that  is  basic	to
       graphical components and state that is often globally accessible in graphics applications.

PUBLIC OPERATIONS

       BrushVar(PSBrush* = nil)
       virtual PSBrush* BrushVar::GetBrush()
       virtual void BrushVar::SetBrush(PSBrush*)

       ColorVar(PSColor* = nil)
       virtual PSColor* ColorVar::GetColor()
       virtual void ColorVar::SetColor(PSColor*)

       FontVar(PSFont* = nil)
       virtual PSFont* FontVar::GetFont()
       virtual void FontVar::SetFont(PSFont*)

       PatternVar(PSPattern* = nil)
       virtual PSPattern* PatternVar::GetPattern()
       virtual void PatternVar::SetPattern(PSPattern*)
	      Each  graphics  state state variable subclass defines a constructor that takes an initial value for the state it represents and adds
	      operations for assigning and retrieving that state.

       GravityVar(boolean = false)
       virtual boolean GravityVar::IsActive();
       virtual void GravityVar::Activate(boolean)
	      The GravityVar constructor takes an initial value that specifies whether gravity is on or off.  IsActive returns the current  value,
	      and Activate changes it to the one supplied.

       MagnifVar(float = 1)
       virtual float MagnifVar::GetMagnif()
       virtual void MagnifVar::SetMagnif(float)
	      The  MagnifVar  constructor  takes an initial value for the magnification factor, and SetMagnify and GetMagnif assign and return the
	      current value.

       ModifStatusVar(Component* = nil, boolean = false)
       virtual boolean ModifStatusVar::GetModifStatus()
       virtual void ModifStatusVar::SetModifStatus(boolean)
       virtual Component* ModifStatusVar::GetComponent()
       virtual void ModifStatusVar::SetComponent(Component*)
	      The ModifStatusVar constructor takes a component instance and an initial value as arguments.  The ModifStatusVar is responsible  for
	      indicating  whether  the	given  component  is modified.	GetModifStatus, SetModifStatus, GetComponent, and SetComponent get and set
	      these arguments.	The modification status will be set automatically (in editors that maintain a  ModifStatusVar  instance)  when	an
	      reversible operation is performed on the component.

       NameVar(const char* = nil)
       virtual const char* NameVar::GetName()
       virtual void NameVar::SetName(const char*)
	      The NameVar constructor takes a string as an optional argument, while GetName and SetName retrieve and assign the string.

       CompNameVar(Component* = nil)
       virtual Component* CompNameVar::GetComponent()
       virtual void CompNameVar::SetComponent(Component*)
       virtual void CompNameVar::UpdateName()
       virtual const char* PartOf()
	      The  CompNameVar	constructor  takes  a component as an optional argument.  CompNameVar inherits the GetName operation from NameVar;
	      calling GetName returns the name associated with the component that the CompNameVar stores.  The GetComponent and SetComponent calls
	      get  and	set the component.  UpdateName updates the string that GetName returns to reflect the component's catalog name.  SetCompo-
	      nent calls this operation automatically when it changes the CompNameVar's component.  PartOf returns the name of the root  component
	      in the CompNameVar component's hierarchy.

SEE ALSO

       Catalog(3U), Component(3U), Editor(3U), StateVar(3U), pspaint(3U)

Unidraw 							   6 August 1990						     statevars(3U)