#include <vector> and ofstream

[retry]

I have an ofstream object for file output which works great.

	ofstream fout;
	fout.open(sFileNAme, ios::out);
.....

Now I added #include <vector> obviously to use vector and the moment I add this, I get compile error with ofstream object:

error C2872: 'ofstream' : ambiguous symbol

How to fix this error?

[Philip Nicoletti]

when you included vector, did you do a "using namespace std;"

if so, are you using :

#include <fstream> // correct

//or

#include <fstream.h>  // not correct

[ahoodin]

Hmm I had no problem with it.

Try moving #include <vector> to stdafx.h

HTH,

[retry]

when you included vector, did you do a "using namespace std;"

if so, are you using :

#include <fstream> // correct

//or

#include <fstream.h>  // not correct

Yes, I do "using namespace std;"

I didn't get how do I correct the problem? I commented #include "fstream.h" but it results in even more errors:

first in the list is:

error C2079: 'fout' uses undefined class 'basic_ofstream<char,struct std::char_traits<char> >'

[Philip Nicoletti]

Well, you need to :

#include <fstream>

[retry]

Thanks that is resloved. A follow up question though on different topic.

I want to to initialize a vector, is that possible?

something like:

vector <string> names (10) = {"Mark", "Dave", "Steve", "Jack"};

This does not compile, but can I initialize my vector some way?

[Paul McKenzie]

Thanks that is resloved. A follow up question though on different topic.

I want to to initialize a vector, is that possible?

something like:

vector <string> names (10) = {"Mark", "Dave", "Steve", "Jack"};

This does not compile, but can I initialize my vector some way?

#include <vector>
#include <string>

void foo()
{
   char *pNames[] = {"Mark", "Dave", "Steve", "Jack"};
   int numnames = sizeof(pNames) / sizeof(pNames[0])'
   std::vector<std::string> names(pNames, pNames + numnames);
}

Note that if you're using Visual C++ 6.0, this will not compile, since VC 6.0 is brain-dead when it comes to automatically converting const char* to string.

It compiles fine using the Comeau compiler, and I suspect it will compile under Visual Studio 2003 and above.

Regards,

Paul McKenzie

[NMTop40]

#include <vector>
#include <string>

void foo()
{
   char *pNames[] = {"Mark", "Dave", "Steve", "Jack"};
   int numnames = sizeof(pNames) / sizeof(pNames[0])'
   std::vector<std::string> names(pNames, pNames + numnames);
}

Note that if you're using Visual C++ 6.0, this will not compile, since VC 6.0 is brain-dead when it comes to automatically converting const char* to string.

It compiles fine using the Comeau compiler, and I suspect it will compile under Visual Studio 2003 and above.

Regards,

Paul McKenzie

Surprised that compiles on Comeau. Should be const char * pNames[] or even const char * const pNames[].

I have a lovely constructor in some of my classes that takes something like

const T (&arr)[N] where N is a template parameter and T is a type (possibly templated). Had they thought about it at the time they'd have given std::vector such a constructor.