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I am over-riding operator new []. I am getting the following error....
c:\Visual Studio Projects\JLib\main.cpp(149): error C2661: 'Object<T>::operator new[]' : no overloaded function takes 3 arguments
The following code results in the above comilation error.
Object<double>* objects;
objects = new Object<double>[5]; // <- error occurrs here
delete [] objects;
If anyone knows what is going on I would very much appreciate an explanation.
Here is the relevant declarations and definitions...
#pragma once
#include <new>
using namespace std;
template <typename T> class Object{
public:
//CONSTRUCTORS ETC ETC ETC
void* operator new[](size_t size) throw(bad_alloc);
void* operator new[](size_t size,const nothrow_t&) throw();
void operator delete[](void* ptr) throw();
void operator delete[](void* ptr,const nothrow_t&) throw();
//OTHER STUF
};
template <typename T> void* Object<T>::operator new[](size_t size) throw(bad_alloc){
Object<T>* data = 0;
if ( (data = ::operator new[](size){
//ommitted for brevity
}
return data;
}
template <typename T> void* Object<T>::operator new[](size_t size,const nothrow_t&) throw(){
Object<T>* data = 0;
if ( (data = ::operator new[](size,const nothrow_t&)) ){
//ommitted for brevity
}
return data;
}
template <typename T> void Object<T>::operator delete[](void* ptr) throw(){
::operator delete [] (ptr);
ptr = 0;
}
template <typename T> void Object<T>::operator delete[](void* ptr,const nothrow_t&) throw(){
::operator delete [] (ptr,const nothrow_t&);
ptr = 0;
}
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You may use
void* operator new(size_t size) throw(bad_alloc);
instead
void* operator new[](size_t size) throw(bad_alloc);
wer ever it is used so ....
RinuRaj
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I need to define an implementatino of the [] version because the instances of Object<t> have data regarding adjacent instantiations when created via new [] . At least logically they do, so it makes sense to set those relationships in the new construction.
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You may check this link ,
http://www.relisoft.com/book/tech/9new.html
This may help you
RinuRaj
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Can you help reproducing this error ?
I tried this way.
template <typename T> class A
{
public:
void* operator new[](size_t t) throw();
};
template <typename T>void* A<T>::operator new[](size_t t) throw()
{
return NULL;
}
int main(int argc, char* argv[])
{
A<double>* objects;
objects = new A<double> [5]; delete [] objects;
return 0;
}
But no error occurs.
-- modified at 1:38 Tuesday 12th September, 2006
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The only difference between your use of the new operator and mine (using your class) is...
Your version:
A* objects;
objects = new A [5];
delete [] objects;
return 0;
My version:
A<double>* objects;
objects = new A<double> [5];
delete [] objects;
return 0;
I dont understand how your code can work without the template type being defined.
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JKallen wrote: Your version:
A* objects;
objects = new A [5];
delete [] objects;
return 0;
Actually, I added < and > there,but suppressed due to html formatting(In all other places I used "andlt and andgt" . I modified it now.
And its working fine. Am I missing something?
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Platform: WinXP, Visual Studio 6
I have a wizard that I created with a propertysheet and 3 propertypages. All have about a half-dozen controls for gathering data. The problem is I don't know how to store the data variables from one page to the next so that at the last page I can use it other than writing it to a file when next button fires.
Thanks!
"Complexity breeds problems. Keep it simple." - Mark
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How about storing the data to the global variables?
Benben
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keep your data in a structure/class, and pass the reference to the each pages. in case of any validation, do it in corresponding page. gotcha? 
['Loka Samastha Sukhino Bhavanthu' - May all beings be happy and free]
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Mark F. wrote: The problem is I don't know how to store the data variables from one page to the next so that at the last page I can use it other than writing it to a file when next button fires.
Use variables for storing each control value, in respective propertypage class.Validate its values when user press next button.
In last page, you can use this code.
CPropertySheet *pSheet=GetParent();
CPropertPage* pPage1=pSheet->GetPage(1);
pPage1->Aceess variables;
CPropertPage* pPage2=pSheet->GetPage(2);
pPage2->Aceess variables;
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The common link between all of the pages is the sheet. Store the data there.
"Talent without discipline is like an octopus on roller skates. There's plenty of movement, but you never know if it's going to be forward, backwards, or sideways." - H. Jackson Brown, Jr.
"Judge not by the eye but by the heart." - Native American Proverb
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Thanks to all. I worked it out!
"Complexity breeds problems. Keep it simple." - Mark
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Mark F. wrote: I worked it out!
Care to share?
"Talent without discipline is like an octopus on roller skates. There's plenty of movement, but you never know if it's going to be forward, backwards, or sideways." - H. Jackson Brown, Jr.
"Judge not by the eye but by the heart." - Native American Proverb
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Hi.
I have a capture graph running (capturing video frames from a webcam)and if windows media player (or winamp) visualization is switched to full screen mode, my graph just seems to freeze. Nothing happens, no video, no errors, no events, nothing. When full screen mode is switched off everything goes back to normal.
Help anyone?
Thanks
Aritosteles
PS: guys I know this might be off topic but I found no other place to post my question and I'm quite desperate
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Just started with C++ a few days ago. Everything going good but need some help with classes - ifstream & ofstream.
Need to be able to display the contents of a text file in a console application. Also any info on how to output to a text file. Have included fstream header but just not getting my head around it !!!!
Most web sites visited just dont seem to be providing the info I need.
Any help with basic code included or good links would be much appreciated !!!!!!
Thanks in advance for any info.
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An ifstream will attempt to read any type using the >> operator. An ofstream will write any type using the << operator. So, if you create a std::string, you can read a file a line at a time like this :
ifstream file("iostream test.txt");
std::string s;
while (!file.eof())
{
file >> s;
// do something with s
}
Now, std::endl is the end of line character, you need to insert this as it's used as a delimiter. The same is true if you're writing a file a line at a time.
Christian Graus - Microsoft MVP - C++
Metal Musings - Rex and my new metal blog
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Hi
Thanks for the code.
Much appreciated as it has been torturing me all afternoon. Working fine now.
Take it easy and thanks for the help.
The problem with political jokes is they get elected.
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Following the CHKBOOK sample in MSDN I finally have two
different views associated with the same document, and working
simultaneously. The problem is that when I run my program I
only get the first view. The second view only appears when I
*open* a document from a file, and not when I start a new one.
The cause is no wonder, because the piece of code that opens
the second view is only inside the OpenDocumentFile() function.
That makes sense in the sample, which is designed to work always
on a file (either is opens an existing file, or it creates a new
one).
Q: What code should I add where, for my application to open both
views on a *new* document?
Furthermore, I have learnt that you can resize a view by calling
its parent frame's MoveWindow() function. I would like to size
each of my two views to a certain desired size at startup. What is
the appropriate place to add this code?
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requemao wrote: Q: What code should I add where, for my application to open both
views on a *new* document?
None. The sample has handled multi-view management already.
After you create/open a document, the main frame adds "Check" and "BooK" menu items to your view menu. You should be to switch views by clicking on either "Check" or "Book".
Best,
Jun
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Sorry, I did not explain it correctly:
It's not the Checkbook application that I'm working on. I am working on an application of my own, which needs to manage and coordinate two different views. I did not know how to achieve that, so I had a look at several articles on CodeGuru and old topics on microsoft.public.vc.mfc, with little to no success. Finally I found the Checkbook sample and tried to imitate it. I succeeded, except that the second view is only shown when I *open* an existing document, but not when I simply start the program or click File/New.
I know I should add some code somewhere, because right now there is only piece of code that spawns the second view, and that is inside CMyApp::OpenDocumentFile(). The question is: where is the appropriate place for that code? (And what is exactly the code, if that's not asking too much).
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Can't be sure without seeing your code. You may verify a couple of things:
1) Your app overrides OpenDocumentFile() so that it displays any views beside the default. The base class OpenDocumentFile() opens the first view as the default.
2) Let your app to handle file-new command, and call the overriden OpenDocumentFile() in the command handler.
Best,
Jun
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Jun Du wrote: 1) Your app overrides OpenDocumentFile() so that it displays any views beside the default.
Yes, this is done. When I open an existing document (and ONLY then), both views appear and work correctly. It is done this way (just like the sample):
CDocument* CSequApp::OpenDocumentFile(LPCTSTR lpszFileName) <br />
{<br />
CSequDoc* pDoc = (CSequDoc*) CWinApp::OpenDocumentFile(lpszFileName);<br />
if (pDoc == NULL)<br />
return NULL;<br />
CFrameWnd* pNewFrame = m_pEditorTemplate->CreateNewFrame(pDoc, NULL);<br />
if (pNewFrame == NULL)<br />
return pDoc;<br />
m_pEditorTemplate->InitialUpdateFrame(pNewFrame, pDoc);<br />
}
Jun Du wrote: 2) Let your app to handle file-new command, and call the overriden OpenDocumentFile() in the command handler.
At present, I have this in the message map:
ON_COMMAND(ID_FILE_NEW, CWinApp::OnFileNew)
If I understand you correctly, I should change it to...
ON_COMMAND(ID_FILE_NEW, OnFileNew)
...and then define the OnFileNew function:
void CSequApp::OnFileNew()<br />
{<br />
CWinApp::OnFileNew();<br />
... (some call to OpenDocumentFile())<br />
}
Is this right? In that case, what's the code I have to add there? I don't think I'll get it right myself...
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requemao wrote: If I understand you correctly, I should change it to...
ON_COMMAND(ID_FILE_NEW, OnFileNew)
...and then define the OnFileNew function:
void CSequApp::OnFileNew()
{
CWinApp::OnFileNew();
... (some call to OpenDocumentFile())
}
Yes.
Best,
Jun
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Check out this technical article [^]; it describes how OnFileNew() should be overridden. Basically, in case of multiple document templates, don't call base class'
CWinApp::OnFileNew();
in CSequApp::OnFileNew(). Add code to retrieve the file name first and then call
OpenDocumentFile(fileName);
The resulting code should be similar to CHKBOOK sample code.
Best,
Jun
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