Questions tagged [derived]
429 questions
6
votes
1 answer
ASP.NET MVC 3.0 Model binding with Base and Derived classes?
Hi all I have a base class called Vehicle and I have all the properties common to all vehicles in there and I have multiple derived classes called Car, Jeep which derive from Vehicle and add more properties
Ex:
public class Vehicle
{
public…
icoolguy
- 75
- 2
- 5
5
votes
2 answers
Using typedef and typename inside a template
I want to define a type name in a templated class that I can use elsewhere to refer to the type of a member in the class.
template
class CA
{
public:
//typedef typename T::iterator iterator_type;
typedef typename T ElementType1; //…
Robotbugs
- 4,307
- 3
- 22
- 30
5
votes
7 answers
implementing abstract methods/classes in java
Can I implement abstract methods in an abstract base class A in java?
If the answer is yes and there is an implemented abstract method in a base class A and there is a derived class B from A (B is not abstract). Does B still has to implement that…
Greg Oks
- 2,700
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- 41
5
votes
3 answers
calling a template function of a derived class
I'm having a problem in C++ with calling a function of a derived class while having a pointer to the base class.
EDIT:
Some answers referred me to CRTP
but my point is that I need to have a pointer to the "Base*" class not "Base*" because I'm…
koby meir
- 437
- 7
- 16
5
votes
0 answers
JavaFX add opacity to derived color via CSS
So, I've got a derived color like this:
derive(-fx-base, 70%)
it has no opacity yet. Is there a way to add opacity to it?
xeruf
- 2,602
- 1
- 25
- 48
5
votes
3 answers
Weird compiler error and template inheritance
Could someone explain me why this code:
class safe_bool_base
{ //13
protected:
typedef void (safe_bool_base::*bool_type)() const;
void this_type_does_not_support_comparisons() const {} //18
safe_bool_base() {}
…
ereOn
- 53,676
- 39
- 161
- 238
5
votes
2 answers
Subquery using derived table in Hibernate HQL
I have a Hibernate HQL question.
I'd like to write a subquery as a derived table (for performance reasons).
Is it possible to do that in HQL?
Example:
FROM Customer WHERE country.id in
(SELECT id FROM (SELECT id FROM Country where type='GREEN')…
Vladimir
- 61
- 1
- 4
5
votes
5 answers
Identifying derived types from a list of base class objects
This may seem kind of "homework-ish" and/or trivial, but it is for a real business purpose; it's just the easiest way I could think of to explain what I'm conceptually trying to do.
Suppose I have an Animal class, and some other classes (Bird, Cat,…
Ron Lhufasen
5
votes
5 answers
Avoid slicing of exception types (C++)
I am designing an exception hierarchy in C++ for my library. The "hierarchy" is 4 classes derived from std::runtime_error. I would like to avoid the slicing problem for the exception classes so made the copy constructors protected. But apparently…
shojtsy
- 1,710
- 3
- 17
- 24
5
votes
3 answers
C#: Inheriting separate static members for derived classes
My problem in brief:
class A
{
/* Other stuff in my class*/
protected static staticMember;
}
class B : A
{
/* Other stuff in my class*/
// Will have A.staticMember but I want B.staticMember (same type)
}
class C : A
{
/* Other…
Calmarius
- 18,570
- 18
- 110
- 157
5
votes
2 answers
Generic function on a list of derived class
I feel my question is pretty dumb, or another way to put it is : I'm too lost in my code to see a workaround for now. Stay too long on a problem, and your vision becomes narrower and narrower ><. Plus I'm not good enough with inheritance,…
Chouppy
- 75
- 6
5
votes
3 answers
How to access template parameters from a derived class?
I have a
template class Base
and
class Derived : public Base<1>
... is there a way to access the int N from inside the definition of a Derived::myMethod() (instead of getting the compiler error "use of undeclared identifier 'N'")?
More…
PhilippJS
- 51
- 2
4
votes
1 answer
Converting a Derived Class to Base Class for WCF Serialisation
I have two classes...
[Serializable]
[DataContract]
public class A
{
[DataMember]
public string _a { get; set; }
[DataMember]
public bool _b { get; set;…
ornah
- 41
- 2
4
votes
2 answers
access base class variable in derived class
class Program
{
static void Main(string[] args)
{
baseClass obj = new baseClass();
obj.intF = 5;
obj.intS = 4;
child obj1 = new child();
Console.WriteLine(Convert.ToString(obj.addNo()));
…
sam
- 149
- 4
- 5
- 10
4
votes
3 answers
Prevent calling base class implemented interface method in the derived class C#
Is it possible to implement an interface in a base class and allow calling/overriding the implemented method in the first derived class level but prevent calling it from any further derived classes?
public interface IInterfaceSample
{
…
Anas
- 61
- 1
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