Hello,
how do i have to call an inherited, templated class constructor from the
initializer list of the inheriting, non-templated class constructor?
example code:
template<typena me T>
class A
{
protected:
sometype* something;
T something_else; /*gives the template some sense here*/
public:
A(sometype* param) : something(param ) {};
}
class B : public A<int>
{
public:
B(sometype* param) : A(param) {}; // <== Compiler Error
/* further member functions */
}
The compiler always tries to identify A as a member variable not being
found, instead of the base class' constructor. 4 5556
On Nov 14, 3:30*pm, "l.s.rock...@we b.de" <l.s.rock...@we b.dewrote:
Hello,
how do i have to call an inherited, templated class constructor from the
initializer list of the inheriting, non-templated class constructor?
example code:
template<typena me T>
class A
{
protected:
* * * * sometype* something;
* * * * T something_else; * * * /*gives the template some sense here*/
public:
* * * * A(sometype* param) : something(param ) {};
}
class B : public A<int>
{
public:
* * * * B(sometype* param) : A(param) {}; // <== Compiler Error
* * * * /* further member functions */
}
The compiler always tries to identify A as a member variable not being
found, instead of the base class' constructor.
The following is a class:
class A { };
this is not:
class A { }
The following declares a class and defines a constructor:
class A
{
A() { }
};
or
// A.hpp (missing include guards)
class A
{
A(); // declaration only
};
// A.cpp
A::A() { } // definition
Basically, a semicolon denotes a declaration.
Salt_Peter wrote:
On Nov 14, 3:30 pm, "l.s.rock...@we b.de" <l.s.rock...@we b.dewrote:
>Hello,
how do i have to call an inherited, templated class constructor from the initializer list of the inheriting, non-templated class constructor?
example code:
template<typen ame T> class A { protected: sometype* something; T something_else; /*gives the template some sense here*/ public: A(sometype* param) : something(param ) {};
}
class B : public A<int> { public: B(sometype* param) : A(param) {}; // <== Compiler Error
/* further member functions */
}
The compiler always tries to identify A as a member variable not being found, instead of the base class' constructor.
The following is a class:
class A { };
this is not:
class A { }
The following declares a class and defines a constructor:
class A
{
A() { }
};
or
// A.hpp (missing include guards)
class A
{
A(); // declaration only
};
// A.cpp
A::A() { } // definition
Basically, a semicolon denotes a declaration.
That's not the point. I just forgot the semicolons in the example.
I found out, that my problem is not only specific to explicit
constructor calls, but occurs everytime I want to call a polymorph
member function of the base class (which is a template class).
I get an undefined reference error from ld.
That's why I start a new post for the more general problem description. l.*********@web .de wrote:
Salt_Peter wrote:
>On Nov 14, 3:30 pm, "l.s.rock...@we b.de" <l.s.rock...@we b.dewrote:
>>Hello,
how do i have to call an inherited, templated class constructor from the initializer list of the inheriting, non-templated class constructor?
example code:
template<type name T> class A { protected: sometype* something; T something_else; /*gives the template some sense here*/ public: A(sometype* param) : something(param ) {};
}
class B : public A<int> { public: B(sometype* param) : A(param) {}; // <== Compiler Error
/* further member functions */
}
The compiler always tries to identify A as a member variable not being found, instead of the base class' constructor.
The following is a class:
class A { };
this is not:
class A { }
The following declares a class and defines a constructor:
class A { A() { } };
or
// A.hpp (missing include guards) class A { A(); // declaration only };
// A.cpp A::A() { } // definition
Basically, a semicolon denotes a declaration.
That's not the point. I just forgot the semicolons in the example.
I found out, that my problem is not only specific to explicit
constructor calls, but occurs everytime I want to call a polymorph
member function of the base class (which is a template class).
I get an undefined reference error from ld.
That's why I start a new post for the more general problem description.
Okay, the problem was that I have used neither the import nor the export
model for template source code organization[1].
I chose the import model and moved the definitions of the template class
member funtions into the header file and everything works.
[1] http://www.ddj.com/cpp/184401563 l.*********@web .de wrote:
Salt_Peter wrote:
>On Nov 14, 3:30 pm, "l.s.rock...@we b.de" <l.s.rock...@we b.dewrote:
>>Hello,
how do i have to call an inherited, templated class constructor from the initializer list of the inheriting, non-templated class constructor?
example code:
template<type name T> class A { protected: sometype* something; T something_else; /*gives the template some sense here*/ public: A(sometype* param) : something(param ) {};
}
class B : public A<int> { public: B(sometype* param) : A(param) {}; // <== Compiler Error
/* further member functions */
}
The compiler always tries to identify A as a member variable not being found, instead of the base class' constructor.
The following is a class:
class A { };
this is not:
class A { }
The following declares a class and defines a constructor:
class A { A() { } };
or
// A.hpp (missing include guards) class A { A(); // declaration only };
// A.cpp A::A() { } // definition
Basically, a semicolon denotes a declaration.
That's not the point. I just forgot the semicolons in the example.
I found out, that my problem is not only specific to explicit
constructor calls, but occurs everytime I want to call a polymorph
member function of the base class (which is a template class).
I get an undefined reference error from ld.
That's why I start a new post for the more general problem description.
Okay, the problem was that I have used neither the import nor the export
model for template source code organization[1].
I chose the import model and moved the definitions of the template class
member funtions into the header file and everything is working now.
[1] http://www.ddj.com/cpp/184401563 This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
by: petards |
last post by:
I am inheriting from a form that has a tab control on it.
The tab control has two pages. I can't seem to access
the second page in the designer for the inherited form in
order to drop controls on it. Any ideas?
Thanks.
|
by: Patrick Corkum |
last post by:
Hello,
I am having a really annoying problem. I have a base form, say FormA,
and this form has some buttons on it with images (which are stored in
the resx file). I then have FormB, which inherits from FormA. FormB
for some odd <and stupid> reason, FormB desides to rewrite all the
designer generated code for the inherited controls. It also puts the
images that FormA has in it's resx into it's own resx <very annoying>.
I have MANY forms...
|
by: ThomasR |
last post by:
I understand that virtual methods on inherited objects are slower than
non-virtual methods because of the indirection required to support the
call.
However, when looking at IL code produced by the compiler, I notice
that all methods on object variables use callvirt instead of call,
regardless of whether the method is truly virtual or not.
I assume this allows .NET to check if the object reference is null or
not before invoking the...
|
by: Boniek |
last post by:
Hi
Sometimes I have problems with my forms which are inherited from other forms
and base forms are in other project. When I change something in base forms
my normal forms are broken in Visual in designing. Maybe inherited forms
aren't compatible with base forms but I don't know how and what. I compile
all projects and everything is ok. When I open one form I see a message like
that "Member not found". I don't know what member and where...
|
by: Wizou |
last post by:
1. Create a TcpListener
2. Start a child Process
3. Kill the parent process
=> You can't bind to the port until you close the child process
Variant :
3. Terminate normally the parent process
=> The parent process stays as "Running" until the child process is
closed
| |
by: seven |
last post by:
I have a base page with an HTMLForm object (added to the base page control
heiarchy during Init).
In the design of pages derived from this base page, I can choose to create
controls and add them to the HTMLForm object I'm inheriting, to create a
postback form. And on one particular page I'm doing just that; defining
controls on the derived page (during Init) and adding these controls to the
inherited HTMLForm object's control...
|
by: John A. Prejean |
last post by:
This one has me stumped. I have a base form I am trying to wrap up, but I
have one problem. In two functions I am opening a "record detail" form. I
would like to keep the code in the base form and pass info to the form
telling it which from to actually open. Any ideas how to do this? Here is
an example of what I had in mind if the text isn't clear enough...
Base Form
Function EditRecord()
Dim frmRecord as New Form()
|
by: DaTurk |
last post by:
Is it possible to have a property defined in one interface, with just
the get portioned stubbed out, and then in an interface inheriting from
that interface declare the set portion of the inherited stubbed out
property? So that only classes implementing the second interface can
set properties?
|
by: Mikus Sleiners |
last post by:
I can't seem to add new controls to form that is inherited from another
form.
I have BaseForm wich have table layout on it 2 panelsm and some buttons.
Now i create InheritedForm : BaseForm and want to add some new controls and
add them to pannels
but i can't drag and drop them ... designer does not allow me. Why is that ?
Panels and table layout modifiers is set to public.
|
by: jleslie48 |
last post by:
I've written a cgi program in C using the borland 5.5 free compiler,
and it runs just fine on an Apache server.
My only issue is if I issue some system calls the cgi suspends until
the call finishes. for example if in my c program I have a line:
system("notepad");
I can see with the taskmanager that an instance of notepad.exe is
|
by: Hystou |
last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it.
First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
| |
by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
|
by: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
|
by: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
|
by: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own....
Now, this would greatly impact the work of software developers. The idea...
|
by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
|
by: conductexam |
last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one.
At the time of converting from word file to html my equations which are in the word document file was convert into image.
Globals.ThisAddIn.Application.ActiveDocument.Select();...
| |
by: TSSRALBI |
last post by:
Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols.
I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
|
by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
| | |