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I am creating an abstract class. I want each of my derived classes to be forced to implement a specific signature of constructor. As such, I did what I would have done has I wanted to force them to implement a method, I made an abstract one.
public abstract...
Started by Anthony D on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
For some generic instantiation code, or are you concerned specific settings on the abstract base class to an object of a derived class, define an abstract method which needs to be implemented by derived classes....
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On Sat, 18 Apr 2009 17:30:00 +0800, "Jack" <jl@knight.com
Dear all,
If I have something like the following,
Mtl* pkMtl = pNode-
where GetMtl() is pure abstract
like
class INode {
virtual Mtl* GetMrl() = 0;
};
When I called GetMtl() in the statement...
Started by Jack on
, 8 posts
by 4 people.
Answer Snippets (Read the full thread at omgili):
The class INode has a /pure
virtual function/, which....
Whether or not pkMt1 is NULL has nothing to do with the fact that Mt1 is an
abstract class, nor, "Jack" <jl@knight.com
I'm not familiar with the term "pure abstract".
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If I want to make a class adaptable, and make it possible to select different algorithms from the outside -- what is the best implementation in C++?
I see mainly two possibilities:
Use an abstract base class and pass concrete object in Use a template ...
Answer Snippets (Read the full thread at stackoverflow):
Inheritance is a way to define....
Abstract base class has on overhead of virtual calls but it has an advantage.
Templates are a way to let a class use a variable of which you don't really care about the type without instance.
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I have an abstract superclass and various subclasses. Each sublcass contains a value that I would like to use statically but it is not possible to create an abstract static method. I want to get a value from them dynamically without having to create instances...
Started by Improfane on
, 8 posts
by 8 people.
Answer Snippets (Read the full thread at stackoverflow):
The other option is to put a registry map in the abstract class - if you need to mandate it, the abstractWhy not go about it the other way? Put the data someplace statically accessible and have refactor) your superclass into a supertype....
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I currently have a class hierarchy like
MatrixBase -> DenseMatrix -> (other types of matrices) -> MatrixView -> TransposeView -> DiagonalView -> (other specialized views of matrices)
MatrixBase is an abstract class which forces implementers...
Started by Victor Liu on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
?
template <class T> void Scale(const <class M,class T> void Scale(M A, const T &scale_factor);
Don't use references, pass by value rvalue references and even overload ....
May be, you should use const.
Of a reference.
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When an object is instantiated in Java, what is really going into memory? Are copies of parent constructors included? Why do hidden data members behave differently than overridden methods when casting? I understand the abstract explanations that are typically...
Started by Joe Cannatti on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
The pointers always point to the "correct variables are the "Instance" of a class....
One pointer exists for each method that is available to the class.
The "Reference" to the class that created it is actually a pointer dispatch table.
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How do I self-instantiate a Java class? I should not use any file other than its class file. Also assume that after the line where I initialized the NAME variable, they don't know the name of the class during compile-time.
Example:
public class Foo implements...
Started by Ramon Marco Navarro on
, 8 posts
by 8 people.
Answer Snippets (Read the full thread at stackoverflow):
Either way, if it's a public class (abstract or not) or an interface, it MUST be defined for the factory pattern.....
How about?
public class Foo { private void instantiate() { Foo foo to create it.
From your question.
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Hello and thanks for any assistance.
I have a wcf service that I'm trying to properly modularize.
I'm interested in finding out if there is a better way or implementing the file and directory structure along with instanciatation, is there a more appropriate...
Started by stevenrosscampbell on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
The CustomerService ....
The Design Patterns book will help far, the Service class would go in a MyProject.Services.Service folder under the MyProject.Services directory.
I mention "FlyWeight" because you talked about performance.
In this.
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I have an interface
std::string get_string(Source const &s, std::string const &d); int get_int(Source const &s, int const &d); bool get_bool(Source const &s, bool const &d);
which I'd like to change to
template<class T> T get(Source const &s, T ...
Started by just somebody on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
::string const ....
?]
Declare the baseclass (t) as abstract, that way an instance can never be created of that class base is an abstract class, you will get a compile-time failure if you try to instantiate it directly.
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Why is the Object class, which is base class of 'em all in Java, not abstract?
I've had this question for a really really long time and it is asked here purely out of curiosity, that's all. Nothing in my code or anybody's code is breaking because it is...
Started by Elister on
, 15 posts
by 15 people.
Answer Snippets (Read the full thread at stackoverflow):
In such circumstances....
The classic hierarchy of animals, where you have an abstract class Animal , the reasoning to make the Animal class abstract is because an instance of Animal is effectively an 'invalid' -by lack is No .
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