error C2784 with ifstream

Question

Hi, I'm getting this error error C2784 with some code I'm trying to compile to read a parameter file.  I created a test class with the same error is below.

foo.h

#pragma once

#include <string>

class Foo
{
public:
   Foo(void);
   ~Foo(void);

    static inline bool skipCommentsReadKey(std::ifstream& config, std::string& key);

};

    inline bool Foo::skipCommentsReadKey(std::ifstream& config, std::string& key)
    {
        bool result = false;

        while (config >> key) {
            if (key[0] == '#') {
                ignoreRestLn(config);
                continue;
            }
            else {
                result = true;
                break;
            }
        }
        return result;
    }

foo.cpp

include "Foo.h"

Foo::Foo(void)
{
}

Foo::~Foo(void)
{
}

The error I get is:

1>------ Build started: Project: Error_C2784, Configuration: Debug Win32 ------
1>Compiling...
1>Foo.cpp
1>c:\_dev\2012\cpptest_err2784\error_c2784\error_c2784\foo.h(19) : error C2784: 'std::basic_istream<_Elem,_Traits> &std::operator >>(std::basic_istream<_Elem,_Traits> &,std::basic_string<_Elem,_Traits,_Alloc> &)' : could not deduce template argument for 'std::basic_istream<_Elem,_Traits> &' from 'std::ifstream'
1>        c:\program files (x86)\microsoft visual studio 8\vc\include\string(425) : see declaration of 'std::operator >>'

Any help appreciated,

Paul

Answer 1

You also need to include fstream too.

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Answer 2

Thanks!

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Paul J.