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Hi,
may u plz look at this error:
#include <complex>
using namespace std;
complex <double> i(0,1); // to get i=sqrt(-1) !!
complex <double> c3 = 1/i ;
The last line gives the following error:
error C2782: 'class std::complex<_Ty> __cdecl std::operator /(const _Ty &,const class std::complex<_Ty> &)' : template parameter '_Ty' is ambiguous
could be 'double'
or 'int'
error C2784: 'class std::complex<_Ty> __cdecl std::operator /(const class std::complex<_Ty> &,const _Ty &)' : could not deduce template argument for 'const class std::complex<_Ty> &' f
rom 'const int'
error C2784: 'class std::complex<_Ty> __cdecl std::operator /(const class std::complex<_Ty> &,const class std::complex<_Ty> &)' : could not deduce template argument for 'const class st
d::complex<_Ty> &' from 'const int'
error C2677: binary '/' : no global operator defined which takes type 'class std::complex<double>' (or there is no acceptable conversion)
Error executing cl.exe.
It also doesn't accept:
complex <double> c3 = 1 + i ;
Any help is highly appreciated!
Regards,
Eliyah
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no it doesn't work either!!
Thanks
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It looks like complex is a template class, and you have not supplied a required argument. My guess is the argument is the type used for the real and imaginary values:
complex<double> complex_with_double_components;
complex<float> complex_with_float_components; I found this[^] on the MSDN; it should help.
Software Zen: delete this;
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How much contention an InterlockedExchangeAdd can stand on a x86 box?
I'm looking for a rough figure how many threads would have to hit the same variable repeatedly how often before I get a notable slow down. I guess this is more critical on a multi-processor-system (so I can't test that)
Pandoras Gift #44: Hope. The one that keeps you on suffering.
aber.. "Wie gesagt, der Scheiss is' Therapie"
boost your code || Fold With Us! || sighist | doxygen
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The interlocked shouldn't cause much trouble. They use a CPU opcode whichs locks the bus for the time that operation needs to complete. That's normally only a few CPU clocks.
I don't think that the performance of multi-processor-systems is influenced very much by this function because windows does use this kind of functions very frequently for every kind of synchronization!
Don't try it, just do it! 
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Hi
I want to find what is the memory usage my application
eg. myapp.exe is the output of myapp.cpp.
when the exe is running it has to print current memory usages at certain execution point.
//myapp.cpp
#iclude <iostream.h>
long getMemStatus()
{
//this method has to find what is the size of memory usage in its current process space
}
void main ()
{
cout<<"\n1. current mem usage:"<
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You are not likely to see much difference for a 'new' on a single int variable unless your application is right on the threshold of an internal allocation block.
If you program is that sensitive to memory, you will probably have more memory trouble trying to find out how much remains than not doing so, since the act of looking up the memory and tracking it will consume memory itself!
Having said that, you can use the:
1. C runtime heap walking routines - these will tell yu what C runtime library allcoations posess
2. Win32 heap walking routines - what memory allcoations your process has made
3. Process memory usage for your entire process using VirtualQuery - find out where DLL are located and which ones are loaded, executable code image memory, reserved memory, commited memory, etc.
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thanks
Blake Miller wrote:
You are not likely to see much difference for a 'new' on a single int variable unless your application is right on the threshold of an internal allocation block
My real problem is not for finding a single int size.
it is just a concept program.
Is there any already written code or example available?
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I am not aware of any on CodeProject that use the VirtualQuery to traverse the memory layout.
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hi,
i am using visual studio 2003, coding in c++. i would like to be able to select a function and find out which functions call the selected one, and then which functions call these, and so on.. is there any way to do this in VS, or does anyone know of an add-in that does this? thanks a lot =)
jay
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see this[^] thread.
I am currently testing the DevPartner Profiler Community Edition
and am impressed by it so far.
I Dream of Absolute Zero
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thanks a lot! that was one of the programs i was looking at, but i didn't realize there was a free version.
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I wrote a simple DLL to smoothly stretch a supplied GDI HBITMAP using the GDI+ bilinear stretch algorithm. ( since GDI stretchblit with halftone is not good enough ) The Dll stretch function uses the drawimage command to write the stretched image directly to the device context of a window in another process. This works fine but it seems the drawimage command sends WM_NCPAINT and WM_ERASEBKGND messages to that window which causes flickering!!!
I could stretch to a memory device context and then bitblit the contents of the memory device context to the window, but the extra bitblt causes an unacceptable increase in CPU processing power.
Another solution would require injecting code into the other process to be able to subclass the window handler but this seems complex and may make the application susceptable to crashes.
Is there a simpler solution??? Any ideas or c++ source code of an image stretch routine with the same quality and speed of the gdiplus bilinear stretch?
VSKSTRETCH_API int WINAPI fnGdiPlusStretch(HBITMAP hBitmap,HDC hDest,int iXpos,int iYpos,int iWidth,int iHeight)
{
Bitmap* pBitMap = NULL;
CPalette Palette;
// +------------+
// | Gdi+ stuff |
// +------------+
HPALETTE hPalette = (HPALETTE)GetCurrentObject( hDest, OBJ_PAL) ;
//Palette.CreateHalftonePalette(hDest);
pBitMap = Bitmap::FromHBITMAP(hBitmap, (HPALETTE)Palette);
Graphics graphics(hDest); // Create Graphics object
graphics.SetInterpolationMode(InterpolationModeBilinear);
graphics.DrawImage(pBitMap,iXpos,iYpos,iWidth,iHeight);
delete pBitMap;
pBitMap = NULL;
return 0;
}
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Okay, I have a question for you...
The MSDN states about the WNDCLASS.cbWndExtra the following:
"Specifies the number of extra bytes to allocate following the window instance. The system initializes the bytes to zero. If an application uses WNDCLASS to register a dialog box created by using the CLASS directive in the resource file, it must set this member to DLGWINDOWEXTRA."
So for example... If I want to store a pointer to some internal structure I need to store associated with a HWND, I can set this cbWndExtra member to sizeof(MyInternalStruct) with RegisterClass... But how can this extra memory be accessed as the HWND is declared as VOID* in windows.h?
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See MSDN on GetClassLongPtr using GCL_CBCLSEXTRA then:
nIndex
[in] Specifies the value to retrieve. To retrieve a value from the extra class memory, specify the positive, zero-based byte offset of the value to be retrieved. Valid values are in the range zero through the number of bytes of extra class memory, minus eight; for example, if you specified 24 or more bytes of extra class memory, a value of 16 would be an index to the third integer.
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Oh yeah, make sure your data structure is pragma packed to be on the boundary size of an integer, since the GetClassLongPtr only returns integers.
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hello,
i use the ATl write a word2000 addin,and add a button into the word toolbars,and now i want to add a picture into the word document when i hit the button,this picture can be a bmp or jpeg.after i insert the picture i can drag it to a proper location.
i tried a long time,but in vain,who can help me?
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Plz tell how to declare and use dynamic arrays in VC.
give example..
thanks
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Raza5680 wrote:
Plz tell how to declare and use dynamic arrays in VC.
Rather then creating your own, Use plenty of Collection classes offered in MFC or STL.
Here are some link that will give more info regarding it:-
http://www.codeproject.com/vcpp/stl/
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
cheers,
Alok Gupta
VC Forum Q&A :- I/ IV
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Creating your own would be done this way:
int* prgYourArray = new int[YourSize];
Behind every great black man...
... is the police. - Conspiracy brother
Blog[^]
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Raza5680 wrote:
Plz tell how to declare and use dynamic arrays in VC.
A classic[^]
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My program has to get the message from Windows, if user writes to hard disk. How program can to get message from Windows, if user wants to write on hard disk?
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Take a look at this link about directory management functions:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/fileio/fs/directory_management_functions.asp
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Hi: How can I change CPropertyPage's caption at runtime?
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