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Visual Studio 6: Initializing static class member

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Join Date: Feb 2005

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Visual Studio 6: Initializing static class member

May 24th, 2005

The following works on solaris, but doesn't compile on windows visual studio 6. is there a way to do this differently so it compiles in both places?

In ComandLineArg.h
-------------------------
class CommandLineArg
{
private:
..etc..
static int longestDescr;
..etc..
};

In CommandLineArg.cpp
-------------------------------

CommandLineArg::longestDescr=0;

Error on visual studio:
error C2501: 'longestDescr' : missing storage-class or type specifiers

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Re: Visual Studio 6: Initializing static class member

May 24th, 2005

You forgot the type:

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int CommandLineArg::longestDescr=0;
int CommandLineArg::longestDescr=0;

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Re: Visual Studio 6: Initializing static class member

May 24th, 2005

I didn't realize I needed to. Why do I need to specify the datatype? (The syntax looks to me as if it is supposed to return an int rather than that it IS an int..)

(Also, why do I not need to on Solaris Workshop compiler?)

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Re: Visual Studio 6: Initializing static class member

May 24th, 2005

>> Why do I need to specify the datatype?
It's a definition. Any valid definition is also a valid declaration, and standard C++ disallows implicit int declarations.

>> The syntax looks to me as if it is supposed to return an int rather than that it IS an int..
How does an object return anything? It might evaluate to something, but only after its definition during use.

>> Also, why do I not need to on Solaris Workshop compiler?
It's either pre-standard implicit int, where if a type is needed, int is assumed, or it's a compiler extension. I would guess the former.

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Re: Visual Studio 6: Initializing static class member

May 24th, 2005

I added the int on it and it worked both on Sun and Visual Studio. Thanks.

(I now have to try and deal with all of MS VStudio's other really complicated STL related warnings and errors - of course all of the rest of the code works fine on SUN as well...)

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Re: Visual Studio 6: Initializing static class member

May 24th, 2005

Here's another good one for you. This also compiles (and runs fine on Solaris)

Properties.h

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 C++ Syntax (Toggle Plain Text) 
template <class K, class V> class Properties : public Printable
{
 ...etc...
 protected:
 
 map<K,V> myMap;
void addMap( map<K,V> mapToAdd);
 
...etc..
};
template <class K, class V> class Properties : public Printable
{
 ...etc...
 protected:
 
 map<K,V> myMap;
void addMap( map<K,V> mapToAdd);
 
...etc..
};

Properties.hpp

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 C++ Syntax (Toggle Plain Text) 
template <class K, class V> void Properties<K,V>::addMap( map<K,V> mapToAdd)
{
 myMap.insert( mapToAdd.begin(), mapToAdd.end() ); 
}
template <class K, class V> void Properties<K,V>::addMap( map<K,V> mapToAdd)
{
 myMap.insert( mapToAdd.begin(), mapToAdd.end() ); 
}

And the wonderfully succint error:
c:\development\danlibs\src\properties.hpp(129) : error C2664: 'class std::_Tree<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,struct std::pair<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> > >,struct std::map<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class std::basic_string<
char,struct std::char_traits<char>,class std::allocator<char> >,struct std::less<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > >,class std::allocator<class std::basic_string<char,struct std::char_traits<char
>,class std::allocator<char> > > >::_Kfn,struct std::less<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > >,class std::allocator<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<
char> > > >::iterator __thiscall std::map<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,struct std::less<class std::bas
ic_string<char,struct std::char_traits<char>,class std::allocator<char> > >,class std::allocator<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > > >::insert(class std::_Tree<class std::basic_string<char,struct
std::char_traits<char>,class std::allocator<char> >,struct std::pair<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
> > >,struct std::map<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,struct std::less<class std::basic_string<char,struc
t std::char_traits<char>,class std::allocator<char> > >,
class std::allocator<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > > >::_Kfn,struct std::less<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > >,class std::allocator<cl
ass std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > > >::iterator,const struct std::pair<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const ,class std::basic_string<char,st
ruct std::char_traits<char>,class std::allocator<char> > > &)' : cannot convert parameter 2 from 'class std::_Tree<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,struct std::pair<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> > >,struct std::map<class std::basic_string<char,struct std::char_traits<char>,class std::allocat
or<char> >,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,struct std::less<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > >,class std::allocator<class std::basic_strin
g<char,struct std::char_traits<char>,class std::allocator<char> > > >::_Kfn,struct std::less<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > >,class std::allocator<class std::basic_string<char,struct std::char
_traits<char>,class std::allocator<char> > > >::iterator' to 'const struct std::pair<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> > > &'
Reason: cannot convert from 'class std::_Tree<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,struct std::pair<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > co
nst ,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > >,struct std::map<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class std::basic_string<char,struct std::char_trai
ts<char>,class std::allocator<char> >,struct std::less<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > >,class std::allocator<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<cha
r> > > >::_Kfn,struct std::less<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > >,class std::allocator<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > > >::iterator' to
'const struct std::pair<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> > >'
No constructor could take the source type, or constructor overload resolution was ambiguous
c:\program files\microsoft visual studio\vc98\include\xmemory(70) : while compiling class-template member function 'void __thiscall Properties<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class std:
:basic_string<char,struct std::char_traits<char>,class std::allocator<char> > >::addMap(class std::map<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >,class std::basic_string<char,struct std::char_traits<char>
,class std::allocator<char> >,struct std::less<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > >,class std::allocator<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > > >
)'

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Re: Visual Studio 6: Initializing static class member

May 24th, 2005

•

Originally Posted by winbatch

And the wonderfully succint error:

http://www.bdsoft.com/tools/stlfilt.html

"One of the methods used by statists to destroy capitalism consists in establishing controls that tie a given industry hand and foot, making it unable to solve its problems, then declaring that freedom has failed and stronger controls are necessary." --Ayn Rand

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Re: Visual Studio 6: Initializing static class member

May 24th, 2005

Dave,

(It looks like I have to install perl for this to work, is that correct?)

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Re: Visual Studio 6: Initializing static class member

May 24th, 2005

I was meaning to try to mess with it, but I never got around to it -- but I believe so.

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Re: Visual Studio 6: Initializing static class member

#10

May 24th, 2005

Are you trying to define that function outside of the header? That ussually can cause problems.

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