Re: problems about Template using - C / C++ / MFC Discussion Boards

Re: problems about Template using

jeansea3-Mar-09 4:15

jeansea

3-Mar-09 4:15

compiler error the message is

error C2668: “min”:

Re: problems about Template using

Cedric Moonen3-Mar-09 4:21

Cedric Moonen

3-Mar-09 4:21

jeansea wrote:
error C2668: “min”:

Not very usefull reply... Sigh | :sigh:

Anyway, you don't have the error when you run but when you compile then ? That's something completely different.
The problem probably comes from the fact that min already exists (I think). Try using another name or putting the function in a specific namespace.

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

Re: problems about Template using

jeansea3-Mar-09 5:02

jeansea

3-Mar-09 5:02

oh....yes

i think you are right when i using another name is can run and no error

thanks

Wink | ;)

Re: problems about Template using

Stuart Dootson3-Mar-09 4:24

Stuart Dootson

3-Mar-09 4:24

jeansea wrote:
compiler error the message is

error C2668: “min”:

Let's be more accurate - that's part of the message...this is the message I get from your code:

error C2668: 'min' : ambiguous call to overloaded function
        a.cpp(6): could be 'Type min<int>(Type,Type)'
        with
        [
            Type=int
        ]
        C:\Program Files\Microsoft Visual Studio 9.0\VC\INCLUDE\xutility(3397): or       'const _Ty &std::min<int>(const _Ty &,const _Ty &)'
        with
        [
            _Ty=int
        ]
        while trying to match the argument list '(int, int)'

It helps when a) programming, or b) asking questions about programming, to get all the details correct and in place...

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: problems about Template using

jeansea3-Mar-09 5:08

jeansea

3-Mar-09 5:08

i want to put all detail messages but i the message show in chinese... Sigh | :sigh:

i know to put all error message next thank for tips

Wink | ;)

Re: problems about Template using

Stuart Dootson3-Mar-09 6:31

Stuart Dootson

3-Mar-09 6:31

jeansea wrote:
i want to put all detail messages but i the message show in chinese...

OK - I'll let you off - my Chinese reading skills are sadly lacking Smile | :)

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: problems about Template using

CPallini3-Mar-09 5:54

CPallini

3-Mar-09 5:54

jeansea wrote:
but when i run the result is show wrong can somebode help me

Cédric Moonen wrote:
What is the result you have and what did you expect ?

jeansea wrote:

compiler error the message is

error C2668: “min”:

TOO FUNNY!
Laugh | :laugh:

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: problems about Template using

Stuart Dootson3-Mar-09 4:17

Stuart Dootson

3-Mar-09 4:17

jeansea wrote:
when i run the result is show wrong

When you run what?

As I expected, you get a compiler error when you try and compile that code, because the standard library already defines a template min function. You need to specify which min you want, by specifying that you want the 'no namespace' version (for that is yours) like this - oh, and you don't need to specify template parameters for functions if the function argument's types unambiguously specify the template parameters:

c = ::min(a, b);

Oh - and using namespace std; is bad form - use a using declaration instead. In your case, that would be 'using std::cout'. Those changes leave your program like this:

#include<iostream>
using std::cout;

template<typename Type>
Type min(Type a,Type b)
{
   return a<b?a:b;
}

int main()
{
   int a = 0, b = 1, c = 3;
   c = ::min(a,b);
   cout<<c;
}

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: problems about Template using

Nemanja Trifunovic3-Mar-09 4:27

Nemanja Trifunovic

3-Mar-09 4:27

Would you stop already? Whenever I want to answer some question here, your answer is already posted.

Programming Blog

utf8-cpp

Re: problems about Template using

Stuart Dootson3-Mar-09 5:47

Stuart Dootson

3-Mar-09 5:47

Sorry sir, I'll stop now Blush | :O

Actually, I'm going to be off t'Internet from Thursday till Monday, so if you could cover for me, that'd be good Smile | :)

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: problems about Template using

Eytukan3-Mar-09 6:57

Eytukan

3-Mar-09 6:57

So your creator has decided to turn off all the bots for a while? :P

He never answers anyone who replies to him. I've taken to calling him a retard, which is not fair to retards everywhere.-Christian Graus

Re: problems about Template using

Stuart Dootson3-Mar-09 8:07

Stuart Dootson

3-Mar-09 8:07

Just for a short time while we upgrade them to a cluster of Mac Pros rather than Mac Minis Poke tongue | ;-P

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

Re: problems about Template using

Eytukan3-Mar-09 17:18

Eytukan

3-Mar-09 17:18

So we can see many lay offs in the forum. People would be grabbed off their MVP shields. And the charge would be taken by the Mac Pros.. D'Oh! | :doh:

No future! Sigh | :sigh:

He never answers anyone who replies to him. I've taken to calling him a retard, which is not fair to retards everywhere.-Christian Graus

Re: problems about Template using

CPallini3-Mar-09 22:46

CPallini

3-Mar-09 22:46

Welcome in the THHB [^], [^].
Smile | :)

Re: problems about Template using

CPallini3-Mar-09 22:45

CPallini

3-Mar-09 22:45

Welcome in the THHB [^], [^]
Smile | :)

Shared pointer in VS2008

vibindia3-Mar-09 3:51

vibindia

3-Mar-09 3:51

I tried using shared pointer in VS 2008 trial edition(Team suite) in a Win32 application,

#include "stdafx.h"
#include <memory>

int _tmain(int argc, _TCHAR* argv[])
{
std::tr1::hexfloat //Only this comes in tr1 namesspace
std::tr1::shared_ptr sharedPtr;
//std::tr1:: error C2039: 'shared_ptr' : is not a member of 'std::tr1'
return 0;
}

It’s supporting auto_ptr but not shared_ptr. Is the problem in my coding or because of trial version.

VIBIN

"Fool's run away,where angle's fear to tread"

Re: Shared pointer in VS2008

Stuart Dootson3-Mar-09 3:57

Stuart Dootson

3-Mar-09 3:57

Could be the trial version - I seem to remember tr1 only got added to VS2008 in service pack 1 or with the Visual C++ 2008 Feature Pack[^].

Anyway - std::tr1::shared_ptr works fine for me on VS2008 with service pack 1 installed.

PS - you'll need to tell shared_ptr (as a template parameter) what type it's pointing at!!!

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

WaitCommEvent

komofilms773-Mar-09 3:05

komofilms77

3-Mar-09 3:05

Hello I want to read from com port1, and I used API

if (WaitCommEvent(hSerial, &dwCommEvent,NULL))
{
if (dwCommEvent & EV_RXCHAR)
{
DWORD dwNumberBytesRead;
if(ReadFile(hSerial, chRead, sizeof(chRead),&dwNumberBytesRead,&osReader))

I have got an extra Thread to read com port but if data is not send to port my program hangs up.
Is there any way to check if input buffer is changed and then ReadFile instead waiting for
WaitCommEvent ??, or if there is some other ways?

Thanks in advace

Re: WaitCommEvent

David Crow3-Mar-09 3:21

David Crow

3-Mar-09 3:21

komofilms77 wrote:
...or if there is some other ways?

See here.

"Old age is like a bank account. You withdraw later in life what you have deposited along the way." - Unknown

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

Re: WaitCommEvent

Stuart Dootson3-Mar-09 4:07

Stuart Dootson

3-Mar-09 4:07

When I've programmed serial ports, I've not used WaitCommEvent - I've set a timeout period with SetCommTimeouts[^] and just used ReadFile. If the serial port receives data or times out, then ReadFile returns successfully and will tell you how many bytes it received (0 probably indicates a timeout).

Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p

convert cstring to LPBYTE

amit.code3-Mar-09 2:58

amit.code

3-Mar-09 2:58

I want to convert a cstring into LPBYTE but each time i convert it only first character get stored in the LPBYTE and rest of the string is truncated.
Thanks

amit

Re: convert cstring to LPBYTE

Cedric Moonen3-Mar-09 3:02

Cedric Moonen

3-Mar-09 3:02

First important point: why do you want to do such a thing ? Are you aware about unicode/non-unicode ? If not, I highly suggest reading this article[^] before going further.

Post also your code to see what you are doing wrong.

Cédric Moonen
Software developer

Charting control [v1.5]
OpenGL game tutorial in C++

Re: convert cstring to LPBYTE

amit.code3-Mar-09 3:08

amit.code

3-Mar-09 3:08

Hi .. thanks for prompt reply. I am getting a file in cstring and i want to parse. The parser take the data in LPBYTE format and file data contain few words in languge other than english thats why i am taking cstring to store it. But when i convert cstring to lpbyte only first character get stores. Meanwhile i am going through the link you have sent.

amit

Re: convert cstring to LPBYTE

David Crow3-Mar-09 3:05

David Crow

3-Mar-09 3:05

amit.code wrote:
I want to convert a cstring into LPBYTE...

How are you doing it? Something like:

CString name("Name");
const LPBYTE lp = (const LPBYTE) (LPCSTR) name;

amit.code wrote:
...but each time i convert it only first character get stored in the LPBYTE and rest of the string is truncated.

How are you verifying this?

Is Unicode defined?

Re: convert cstring to LPBYTE

amit.code3-Mar-09 3:12

amit.code

3-Mar-09 3:12

Yes .. i have also tried the method that you mentioned. I am parsing that whole data that comes in lpbyte but it shows only one character. During debugging I am verifying it also throughg watch window.
Thanks

amit

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