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I have a vector of strings which I want to search for a particular string.
I am using:
vector<string>::iterator it = find( vecStrings.begin(), vecStrings.end(), sMax );
sMax is a std::string
When I compile this (and it is specifically this line causing the problem) I get the following:
c:\program files\microsoft visual studio\vc98\include\algorithm(43) : error C2784: 'bool __cdecl std::operator ==(const class std::vector<_Ty,_A> &,const class std::vector<_Ty,_A> &)' : could not deduce template argument for 'const class std::vector
<_Ty,_A> &' from 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >'
C:\test\test.cpp(6846) : see reference to function template instantiation 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > *__cdecl std::find(class std::basic_string<char,struct std::char_trai
ts<char>,class std::allocator<char> > *,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > *,const class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > &)' being compiled
c:\program files\microsoft visual studio\vc98\include\algorithm(43) : error C2784: 'bool __cdecl std::operator ==(const class std::allocator<_Ty> &,const class std::allocator<_U> &)' : could not deduce template argument for 'const class std::allocat
or<_Ty> &' from 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >'
C:\test\test.cpp(6846) : see reference to function template instantiation 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > *__cdecl std::find(class std::basic_string<char,struct std::char_trai
ts<char>,class std::allocator<char> > *,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > *,const class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > &)' being compiled
c:\program files\microsoft visual studio\vc98\include\algorithm(43) : error C2784: 'bool __cdecl std::operator ==(const class std::istream_iterator<_U,_E,_Tr> &,const class std::istream_iterator<_U,_E,_Tr> &)' : could not deduce template argument fo
r 'const class std::istream_iterator<_U,_E,_Tr> &' from 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >'
C:\test\test.cpp(6846) : see reference to function template instantiation 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > *__cdecl std::find(class std::basic_string<char,struct std::char_trai
ts<char>,class std::allocator<char> > *,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > *,const class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > &)' being compiled
c:\program files\microsoft visual studio\vc98\include\algorithm(43) : error C2784: 'bool __cdecl std::operator ==(const class std::reverse_bidirectional_iterator<_BI,_Ty,_Rt,_Pt,_D> &,const class std::reverse_bidirectional_iterator<_BI,_Ty,_Rt,_Pt,_
D> &)' : could not deduce template argument for 'const class std::reverse_bidirectional_iterator<_BI,_Ty,_Rt,_Pt,_D> &' from 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >'
C:\test\test.cpp(6846) : see reference to function template instantiation 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > *__cdecl std::find(class std::basic_string<char,struct std::char_trai
ts<char>,class std::allocator<char> > *,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > *,const class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > &)' being compiled
c:\program files\microsoft visual studio\vc98\include\algorithm(43) : error C2784: 'bool __cdecl std::operator ==(const class std::istreambuf_iterator<_E,_Tr> &,const class std::istreambuf_iterator<_E,_Tr> &)' : could not deduce template argument fo
r 'const class std::istreambuf_iterator<_E,_Tr> &' from 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >'
C:\test\test.cpp(6846) : see reference to function template instantiation 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > *__cdecl std::find(class std::basic_string<char,struct std::char_trai
ts<char>,class std::allocator<char> > *,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > *,const class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > &)' being compiled
c:\program files\microsoft visual studio\vc98\include\algorithm(43) : error C2784: 'bool __cdecl std::operator ==(const class std::reverse_iterator<_RI,_Ty,_Rt,_Pt,_D> &,const class std::reverse_iterator<_RI,_Ty,_Rt,_Pt,_D> &)' : could not deduce te
mplate argument for 'const class std::reverse_iterator<_RI,_Ty,_Rt,_Pt,_D> &' from 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >'
C:\test\test.cpp(6846) : see reference to function template instantiation 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > *__cdecl std::find(class std::basic_string<char,struct std::char_trai
ts<char>,class std::allocator<char> > *,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > *,const class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > &)' being compiled
c:\program files\microsoft visual studio\vc98\include\algorithm(43) : error C2784: 'bool __cdecl std::operator ==(const struct std::pair<_T1,_T2> &,const struct std::pair<_T1,_T2> &)' : could not deduce template argument for 'const struct std::pair<
_T1,_T2> &' from 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >'
C:\test\test.cpp(6846) : see reference to function template instantiation 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > *__cdecl std::find(class std::basic_string<char,struct std::char_trai
ts<char>,class std::allocator<char> > *,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > *,const class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > &)' being compiled
c:\program files\microsoft visual studio\vc98\include\algorithm(43) : error C2676: binary '==' : 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >' does not define this operator or a conversion to a type accept
able to the predefined operator
C:\test\test.cpp(6846) : see reference to function template instantiation 'class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > *__cdecl std::find(class std::basic_string<char,struct std::char_trai
ts<char>,class std::allocator<char> > *,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > *,const class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > &)' being compiled
Any ideas?
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Hi,
Your compiler's first message is explanative:
Jonnster wrote: I get the following:
c:\program files\microsoft visual studio\vc98\include\algorithm(43) : error C2784: 'bool __cdecl std::operator ==(const class std::vector<_Ty,_A> &,const class std::vector<_Ty,_A> &)' : could not deduce template argument for 'const class std::vector
Make it happy with:
std::vector<std::string>::iterator it = std::find(vecStrings.begin(), vecStrings.end(), sMax); With C++0x (VS2010 or gcc 4.5) you can write:
auto it = std::find(vs.begin(), vs.end(), sMax); which instructs the compiler to deduce the type of it.
With previous compilers use typedef to get simpler code:
typedef std::vector<std::string> VS;
VS vs;
VS::iterator it = std::find(vs.begin(), vs.end(), sMax);
cheers,
AR
C++0x wording edited
When the wise (person) points at the moon the fool looks at the finger (Chinese proverb)
modified on Friday, October 22, 2010 4:24 AM
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Hi All,
I want to declare memory dynamically for a 2 dimensional array.
and then want to use that pointer like an array.
as i am using ANSI compiler so there is no need to typecast the return type of the memory block returned by malloc()
so if i will write the inline code line as arr=malloc (nrows*5*sizeof(int)); its working correctly but i just want to know to be at the safer side that if i will be using the old compiler how to type cast the same as arr=(int [] *)(malloc (nrows*5*sizeof(int))); this is giving error.(i am on linux)
thanks
#include<stdio.h>
#include<stdlib.h>
int main()
{
int nrows=2,i,j;
int (*arr)[5];
<code>arr=(int [] *)(malloc (nrows*5*sizeof(int)));</code>
for(i=0;i<nrows;i++)
for (j=0;j<5;j++)
arr[i][j]=17;
for(i=0;i<nrows;i++)
for (j=0;j<5;j++)
printf("\n%d",arr[i][j]);
}
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Try this:
arr=(int (*)[5])malloc (nrows*5*sizeof(int));
Alternatively (and this is clearer overall) use a typedef:
typedef int (*ArrType)[5];
int main()
{
ArrType arr;
arr=(ArrType)malloc (nrows*5*sizeof(int));
... Rest of code ...
}
Java, Basic, who cares - it's all a bunch of tree-hugging hippy cr*p
CodeProject MVP for 2010 - who'd'a thunk it!
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i use in linux by make,
but it output:
Linking CppFit_tests
lib/libCppFit.a(Mutex.o): In function `Mutex::Mutex()':
Mutex.cpp text+0x18): undefined reference to `pthread_mutexattr_init'
Mutex.cpp text+0x2b): undefined reference to `pthread_mutexattr_settype'
lib/libCppFit.a(Mutex.o): In function `Mutex::Mutex()':
Mutex.cpp text+0xaa): undefined reference to `pthread_mutexattr_init'
Mutex.cpp text+0xbd): undefined reference to `pthread_mutexattr_settype'
lib/libCppFit.a(Thread.o): In function `Thread::start()':
Thread.cpp text+0x230): undefined reference to `pthread_create'
lib/libCppFit.a(Thread.o): In function `Thread::join()':
Thread.cpp text+0x268): undefined reference to `pthread_join'
collect2: ld returned 1 exit status
The program is:
struct MutexInnards
{
public:
pthread_mutex_t mutex;
int nestLevel;
};
Mutex::Mutex()
{
pthread_mutexattr_t attr;
pthread_mutexattr_init(&attr);
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
innards = new MutexInnards();
innards->nestLevel = 0;
pthread_mutex_init(&innards->mutex, &attr);
}
Mutex::~Mutex()
{
pthread_mutex_destroy(&innards->mutex);
delete innards;
}
void Mutex::acquire()
{
pthread_mutex_lock(&innards->mutex);
// innards->nestLevel++;
}
void Mutex::release()
{
// innards->nestLevel--;
// if (innards->nestLevel <= 0)
// {
// innards->nestLevel = 0;
pthread_mutex_unlock(&innards->mutex);
// }
}
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I don't really see much of a question here but I assume the problem is the undefined references in your link action, all of which suggest you are missing a reference to a library from your make file.
Just say 'NO' to evaluated arguments for diadic functions! Ash
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thanks, i will look something about make file again
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It's not so much the make file itself but your rules. In your code you have calls to pthread_mutexattr_init and others, but the linker cannot resolve those names. This suggests that the names are defined in an external library which has not been added to your list of dependencies in the build of your executable. Identify that library and you have solved the issue.
Just say 'NO' to evaluated arguments for diadic functions! Ash
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You're welcome. 
Just say 'NO' to evaluated arguments for diadic functions! Ash
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hi all
I got following problem :
I want to read and variable (age ) but when its not properly entered I want to write
bad format or etc.
example
printf("enter age \n");
scanf ("%d,&age");
and I need to create a condition which is saying in case you enter string or non integer number (7,5 )
write bad format eter again
thanks
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This is a common problem of scanf(). You can use this[^] technique to solve your problem.
NOTE: Next time when you want to post a C question please use the C\C++\MFC forum[^].
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Use the features of the function to verify your input; see the MSDN documentation here[^]. A simple loop checking that you have a converted field and that its value is within the range you require should do the trick.
Just say 'NO' to evaluated arguments for diadic functions! Ash
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Hi,
Supposing you search in this forum a C++ STL solution 
#include<iostream>
#include<strstream>
#include<string>
int main()
{
using std::cout;
using std::endl;
cout << "Enter age" << endl;
int age = -1;
std::string s;
while (age < 0)
{
std::getline(std::cin, s);
if (s.empty())
cout << "Try again!" << endl;
else if (s.find_first_not_of("0123456789") != s.npos)
cout << s << " is not a valid age. Try again!" << endl;
else
std::istrstream(s.c_str()) >> age;
const int HighestAgeEver = 122;
if (age > HighestAgeEver)
{
cout << age << "!! You are kidding. Try again!" << endl;
age = -1;
}
}
cout << "Your age is " << age << endl;
return 0;
}
cheers,
AR
Edited to handle empty input and unrealistic age
And for simpler code flow
When the wise (person) points at the moon the fool looks at the finger (Chinese proverb)
modified on Wednesday, October 13, 2010 1:37 PM
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Hi all,
I have been working on this project where i receive a stream of data over a UDP port. This Data is to be processed and the result is to be distributed to the clients. To accomplish this end i have created an ATL service along with a connection point interface. Now the actual problem is how to call the Fire_Event method as i have created a thread from the service which reads the data stream. Can someone please help me as to how can i call the fire method as the functions that reads a stream and should generate the event OnDataChange is not member of the Connectionpoint interface.
Thanks and regards,
Pratik
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hi all,
I used vc6.0 ->Create a new Activex project, MFC ActiveX ControlWizard
I created a new button,and want to the button shows Tooltip when the mouse in the button's rect.
here is my code:
BEGIN_MESSAGE_MAP(CTestCtrl, COleControl)
//{{AFX_MSG_MAP(CTestCtrl)
ON_WM_CREATE()
//}}AFX_MSG_MAP
ON_OLEVERB(AFX_IDS_VERB_PROPERTIES, OnProperties)
//add Tooltip Message
ON_NOTIFY_EX( TTN_NEEDTEXTA, 0, OnToolTipNotify )
ON_NOTIFY_EX( TTN_NEEDTEXTW, 0, OnToolTipNotify )
END_MESSAGE_MAP()
BOOL CTestCtrl::OnToolTipNotify( UINT id, NMHDR * pNMHDR, LRESULT * pResult )
{
TOOLTIPTEXT *pTTT = (TOOLTIPTEXT *)pNMHDR;
UINT nID =pNMHDR->idFrom; //
pTTT->lpszText ="Test";
pTTT->hinst = AfxGetResourceHandle();
return(TRUE);
}
it works well in "VC6" and "ActiveX Control Test Container",but in vb or C# or ie,it doesn't show the tooltip,
who can tell me ,how can i do for this issue.
thanks
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Hi All
I have problems to send print in my application.
If I send print and if I change my view before ready to print, all commands will be cancelled.
I send direct to print, print setup is not showed, the view can be closed, and OpenDocumentFile doesn't show this view if command is print;
My application needs fill a graph, reading from a database, while not read all data he is not ready to print, I have a flag to do this.
See my code:
if(pDoc!=NULL)
{
dwTick=::GetTickCount();
nPrintWindowTimeout=5;
if(nPrintWindowTimeout<0)
nPrintWindowTimeout=0;
dwWaitLimit=(DWORD)nPrintWindowTimeout*1000;
if(pDoc->IsReadyForPrintWindow() || (dwTick < item.m_dwTickStart || dwTick - item.m_dwTickStart > dwWaitLimit) )
{
m_arPrintQueue.RemoveAt(0);
pDoc->SetPrinting(TRUE);
if (pDoc->GetView())
{
if (item.m_bPrintSetup == TRUE)
pDoc->GetView()->SendMessage(WM_COMMAND, ID_FILE_PRINT_SETUP);
else
pDoc->GetView()->SendMessage(WM_COMMAND, ID_FILE_PRINT);
}
pDoc->SetPrinting(FALSE);
pDoc->OnCloseDocument();
}
}
}
Somebody, can help me?
Thank you
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Hi,
I have following block of code,
class Base
{
public:
Base()
{
cout<<"Constructor: Base"<<endl;
}
~Base()
{
cout<<"Destructor : Base"<<endl;
}
virtual void fun();
};
class Derived: public Base
{
public:
Derived()
{
cout<<"Constructor: Derived"<<endl;
}
~Derived()
{
cout<<"Destructor : Derived"<<endl;
}
void fun()
{
cout<<" in der";
}
};
int _tmain(int argc, _TCHAR* argv[])
{
Derived obj;
obj.fun();
getche();
In above code virtual fun() is showing error that it not resolved. If i add blank body then Derived class's Fun()is called. Is it necessary to have blank body for virtual function in base class and what is reason of this. 
Thanks
abm
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Hi,
Your Base::fun() member is declared but not defined, so the linker complains.
You have to define it somewhere either as pure virtual virtual void fun() = 0; or otherwise:
virtual void Base::fun(){};
cheers,
AR
When the wise (person) points at the moon the fool looks at the finger (Chinese proverb)
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Hi all!
Sorry for my english, I use it very rarely and have bad grammer 
I tired to get moving marquee progress bar in my project. I read many articles, try different variants, but nothing work. Progress bar freezes in left side and only, what I can do, change it size, by varying range.
All, wat I do:
1. add refference into manifest file for common controls:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
<assemblyIdentity
version="1.0.0.0"
processorArchitecture="X86"
name="XPProgress"
type="win32" />
<description>XPProgress</description>
<dependency>
<dependentAssembly>
<assemblyIdentity
type="win32"
name="Microsoft.Windows.Common-Controls"
version="6.0.0.0"
processorArchitecture="X86"
publicKeyToken="6595b64144ccf1df"
language="*" />
</dependentAssembly>
</dependency>
</assembly>
2. change supported windows versions:
#define _WIN32_WINDOWS 0x0501
3. enable common controls:
::AtlInitCommonControls (ICC_COOL_CLASSES | ICC_BAR_CLASSES | ICC_PROGRESS_CLASS);
4. create simple dialog with progress bar:
IDD_DIALOG DIALOGEX 0, 0, 331, 44
STYLE DS_SETFONT | DS_MODALFRAME | DS_FIXEDSYS | WS_POPUP | WS_CAPTION | WS_SYSMENU
CAPTION "Dialog"
FONT 8, "MS Shell Dlg", 400, 0, 0x1
BEGIN
DEFPUSHBUTTON "OK",IDOK,137,23,50,14
CONTROL "",IDC_PROGRESS,"msctls_progress32",WS_BORDER,7,7,317,14
END
5. create dialog class:
class CDlgMain : public CDialogImpl<CDlgMain>
{
public:
enum { IDD = IDD_DIALOG };
CDlgMain(void);
~CDlgMain(void);
BEGIN_MSG_MAP(CDlgMain)
MESSAGE_HANDLER(WM_INITDIALOG, OnInitDialog)
MESSAGE_HANDLER(WM_CLOSE, OnClose)
COMMAND_ID_HANDLER(IDOK, OnOK)
END_MSG_MAP()
LRESULT OnInitDialog(UINT , WPARAM , LPARAM , BOOL& );
LRESULT OnClose(UINT , WPARAM , LPARAM , BOOL& );
LRESULT OnOK(WORD , WORD wID, HWND , BOOL& );
};
6. on button click - enable/disable marquee option for toolbar:
LRESULT CDlgMain::OnOK(WORD , WORD wID, HWND , BOOL& )
{
DWORD dwWinLong = ::GetWindowLong(GetDlgItem (IDC_PROGRESS), GWL_STYLE);
if (dwWinLong & PBS_MARQUEE)
{
::SetWindowLong(GetDlgItem (IDC_PROGRESS), GWL_STYLE, dwWinLong & (~PBS_MARQUEE));
::SendMessage(GetDlgItem (IDC_PROGRESS), PBM_SETMARQUEE, (WPARAM) 0, (LPARAM) 100);
}
else
{
::SetWindowLong(GetDlgItem (IDC_PROGRESS), GWL_STYLE, dwWinLong | PBS_MARQUEE);
::SendMessage(GetDlgItem (IDC_PROGRESS), PBM_SETMARQUEE, (WPARAM) 1, (LPARAM) 100);
}
return TRUE;
}
Result is freezed progress bar, that not moving anywhere
I discovered, than, when I change progress bar range to smaller values, visible progress line grow biger, but nowhere moves.
::SendMessage(GetDlgItem (IDC_PROGRESS), PBM_SETRANGE, 0, MAKELPARAM(0, 20));
Someone can tell me, what I do wrong, or what I miss? I read many articles in different sites and forums, but there say, that is enough to enable progress bar animation.
karuuzo
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Hi,
You are mixing the control style, must have PBS_MARQUEE, and it's state.
Set the control style either in your DIALOG resource descriptor:
CONTROL "",IDC_PROGRESS, "msctls_progress32", PBS_MARQUEE | WS_BORDER, 23, 38, 80, 14
or in your OnInitDialog() handler:
LRESULT OnInitDialog(UINT , WPARAM , LPARAM , BOOL& )
{
CProgressBarCtrl(GetDlgItem(IDC_PROGRESS)).ModifyStyle(0, PBS_MARQUEE);
return TRUE;
}
and in your OnOK() handler switch the moving state, for instance:
LRESULT OnOK(WORD , WORD , HWND , BOOL& )
{
static bool bAnimated = false;
CProgressBarCtrl(GetDlgItem(IDC_PROGRESS)).SetMarquee(bAnimated = !bAnimated);
return 0;
}
cheers,
AR
When the wise (person) points at the moon the fool looks at the finger (Chinese proverb)
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Sorry, not working
I already try all variants, what I can imagine - progress bar marquee definition in resource file, using WTL classes, windows messages, but nothing works.
There latest code, but progress bar still dead
LRESULT CDlgMain::OnInitDialog(UINT , WPARAM , LPARAM , BOOL& )
{
CenterWindow();
CProgressBarCtrl(GetDlgItem(IDC_PROGRESS)).ModifyStyle(0, PBS_MARQUEE);
return TRUE;
}
LRESULT CDlgMain::OnClose(UINT , WPARAM , LPARAM , BOOL& )
{
EndDialog(0);
return TRUE;
}
LRESULT CDlgMain::OnOK(WORD , WORD wID, HWND , BOOL& )
{
static bool bAnimated = false;
CProgressBarCtrl(GetDlgItem(IDC_PROGRESS)).SetMarquee(bAnimated = !bAnimated);
return TRUE;
}
IDD_DIALOG DIALOGEX 0, 0, 331, 44
STYLE DS_SETFONT | DS_MODALFRAME | DS_FIXEDSYS | WS_POPUP | WS_CAPTION | WS_SYSMENU
CAPTION "Dialog"
FONT 8, "MS Shell Dlg", 400, 0, 0x1
BEGIN
DEFPUSHBUTTON "OK",IDOK,137,23,50,14
CONTROL "",IDC_PROGRESS,"msctls_progress32",PBS_MARQUEE | WS_BORDER,7,7,317,14
END
karuuzo
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Hi,
karuuzo wrote: Sorry, not working
What does that mean?
AR
When the wise (person) points at the moon the fool looks at the finger (Chinese proverb)
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Nothing shows on the progress bar. I get only this and nothing else.
karuuzo
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I uploaded a working sample at MarqueeTest.zip (6.2 KB)
cheers,
AR
When the wise (person) points at the moon the fool looks at the finger (Chinese proverb)
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