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Jeremy Falcon wrote: if you don't hold it against me for sneaking the occasional macro or two in some code when you're not looking.
Its a long piece of rope, you do what you like with it
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No, I'm not missing the point. Perhaps you can explain the advantages of macros over inline functions? There are some things inline functions can't do like stringisation and token pasting and such; but when inline functions can be used they're a better solution for many reasons including the following:
- Type safety.
- Automatically disabled in debug builds to aid debugging.
- Can use multiline constructs without having to end each line with a "\".
- Can be put into namespaces!
- Can be members of classes and structs!
- Can be overloaded!
.
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Steve
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Stephen Hewitt wrote: Perhaps you can explain the advantages of macros over inline functions?
Perhaps you can read my posts and find the answer there already seeing as I said it more than once.
Stephen Hewitt wrote: - Type safety.
Addressed twice. The type safety you refer to isn't a real issue since a macro expands to type safe code.
Stephen Hewitt wrote: - Automatically disabled in debug builds to aid debugging.
And like typing #ifdef _DEBUG will break your arm.
Stephen Hewitt wrote: - Can use multiline constructs without having to end each line with a "\".
You know you're reaching deep when you have syntax as reasoning. 
Stephen Hewitt wrote: - Can be put into namespaces!
- Can be members of classes and structs.
- Can be overloaded.
Actually these are very good points, but it doesn't really mean inline functions should always be used in place of macros as you suggest. Besides, this has contradicting logic. I mean, why write an inline function... usually for speed right? Using the second two of your three points quoted would effectively break that anyway.
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No one says macros should never be used, just that they shouldn’t be used when other superior constructs exist for the same task; the specific example in this case is that macros should not be used as inline functions. I have constantly argued the point, complete with examples and data (compiler output) to support my claims; while you seem intent on arguing the person and accusing people of missing the point. Well I've had my say and I'll let my comments speak for themselves.
Steve
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Stephen Hewitt wrote: No one says macros should never be used, just that they shouldn’t be use when other superior constructs exist for the same task; the specific example in this case is that macros should not be used as inline functions.
I'm sorry you don't understand context - my bad. I'll have to remember that next time I write something.
Stephen Hewitt wrote: I have constantly argued the point, complete with examples and data (compiler output) to support my claims;
And that makes you correct how?
Stephen Hewitt wrote: while you seem intent on arguing the person and accusing people of missing the point. Well I've had my say and I'll let my comments speak for themselves.
Fair enough, but don't accuse me of what you did, and that is to argue a point I never spoke against. Have a nice day.
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Stephen Hewitt wrote: No one says macros should never be used, just that they shouldn’t be use when other superior constructs exist for the same task; the specific example in this case is that macros should not be used as inline functions.
Actually, I just reread what I said. I did mention inline functions. Perhaps you should bother reading my posts... oh wait.
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Stephen Hewitt wrote: - Can be members of classes and structs!
- Can be overloaded!
Now that I think about it, that extra cost my be placed on the compile time rather than the run time. But alas, I'm too lazy and and it's getting too late for me to look into it.
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inline is the standout, it's different to the others.
inline is a *suggestion* to the compiler that this function is so simple, that it's more efficient to write the code for this function in the places where it's called, instead of paying the cost of a call to another memory address to run it. The vital thing to understand is that hte compiler is both free to inline things itself, and to decide you're wrong and *not* inline the function.
Christian Graus - Microsoft MVP - C++
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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Christian Graus wrote: inline is a *suggestion* to the compiler that this function is so simple
I hate to use your post, but that's a great reason I forgot. There is no real guarantee inline will even work. You're guaranteed to have inline expansion with macros though.
Man, old age is getting to me. 
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The only times I've seen MSVC ignore an inline directive is when its had no choice such as with recursive functions: in this context this is a feature.
Steve
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Stephen Hewitt wrote: The only times I've seen MSVC ignore an inline directive is when its had no choice such as with recursive functions: in this context this is a feature.
And MSVC is the only compiler in existence too.
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No, it isn't. Until recently it was one of the worst (MSVC 6) in common use. I have inspected the machine code generated by MSVC 6 (I do a lot of postmortem debugging at work) and the inlining works as expected except when that’s not possible, as I mentioned before. The Microsoft compilers after MSVC 6 produce even better code from what I’ve seen. All modern C++ compiler support inlining just fine.
Steve
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And some even inline code without you asking for it if the optimisation is set right 
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On MSVC this can be controlled with the /Ob[^] compiler switch.
Steve
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Stephen Hewitt wrote: Until recently it was one of the worst (MSVC 6) in common use. I have inspected the machine code generated by MSVC 6 (I do a lot of postmortem debugging at work) and the inlining works as expected except when that’s not possible, as I mentioned before. The Microsoft compilers after MSVC 6 produce even better code from what I’ve seen.
And you just felt the need to say this right? I don't really see how this has anything to do with the point that was quoted - which I'm sure you could've guessed is sarcasm.
Stephen Hewitt wrote: All modern C++ compiler support inlining just fine.
Nice blanket statement there. Notice the extra little comments in these links that have nothing to do with recursion.
http://gcc.gnu.org/onlinedocs/gcc/Inline.html[^]
http://www.osc.edu/hpc/manuals/ia64/docs2/c_ug_lnx.pdf[^]
I don't know about you, but it seems easier to me to just use a macro rather than learn all the quirks of every compiler in the world.
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The GDI+ documentation describes the Effect Class and numerous subclasses of it (HueSaturationLightness, Tint, ColorBalance, Blur, etc.) I can't find these in any of the GDI+ header files downloaded as part of the PlatformSDK from Microsoft. Also, they don't even appear to be in gdiplus.dll. Does anyone know the header files and dll they're in.
Thanx
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They should be in gdiplus.dll.. Check that you have the latest version.. I know that GDI+ is fully supported in Visual Studio so you could use that if you have access to that? I'm not sure if it's supported in the Express versions, if it is you could try using Visual C++ express free from MS
Hope this helps!
--PerspX
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Do you know which header files they're declared in?
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Well the main header file for GDI+ is obviously gdiplus.h. There are then other GDI+ header files which are used, however I believe that they are all included from gdiplus.h anyway, so that shouldn't be a problem.. What happens at compile time with your project?
Hope this helps!
--PerspX
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Perspx wrote: Well the main header file for GDI+ is obviously gdiplus.h. There are then other GDI+ header files which are used, however I believe that they are all included from gdiplus.h anyway, so that shouldn't be a problem.. What happens at compile time with your project?
The compiler's not finding the declarations (compiler error). I'm using Dev-C++ as a compiler (mingw - its gnu or something). I downloaded the PlatformSDK a couple of weeks ago, and have compiled and ran GDI+ code using The Bitmap, Font, and TextureBrush classes, etc. with no problem. I have numerous GDI+ headers, none of them contain the Effect classes. If you can do a "Find in File HueSaturationLightness *.h", I'd appreciate it.
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Hmm.. It is pretty odd.. I have looked through the VS header files and there doesn't appear to be any reference to any of the effects classes as previously mentioned (I am using VS 2005 Professional). I have used GDI+ on several occasions, but I have not used any of the effects classes.
I'm very sorry I cannot help you any further.
--PerspX
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GDI+ is included with the operating system, not a part of Visual Studio.
As stated by Perspx, according to the docs for the Effect class: "Declared in Gdipluseffects.h, include gdiplus.h"
Mark
Mark Salsbery
Microsoft MVP - Visual C++
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Odd.. my copy of Visual Studio doesn't seem to have Gdipluseffects.dll :S sorry about that.. I would have been able to help you sooner otherwise.. Thanks for clearing that up Mark
--PerspX
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I didn't clear anything up (well, maybe the part about GDI+ not being part of Visual
Studio  ).
AFAIK you had it right - include gdiplus.h should be all the OP needs to do.
Cheers!
Mark
Mark Salsbery
Microsoft MVP - Visual C++
"Go that way, really fast. If something gets in your way, turn."
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Hello,
I am working on an application that streams uncompressed data from high resolution video cameras directly to a hard drive. The amount of data that I am writing is very high, and if I start to write while the drive is idle, I lose a significant number of initial video frames.
Does anyone know a simple way using c++ (on Windows XP) to keep a drive ready to go?
My first thought is to open a file, write some bits, close it and delete it every so often, but I worry that it might just sit in the hard drive buffer without spinning up the drive (and if the data doesn't sit in the HD buffer, it seems like a bit of overkill anyway).
And I guess I also have a follow up question, is it possible to check the drive to see if it is idle, or if it is spun up? I've looked in the windows SDK, but the disk managment functions in the Platform SDK are a little light.
Thanks for the help,
Adam
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