Hello.

I'm porting some C++ code from Solaris to NT, using MSVC++ 5.0 w/o SP3.
It seems that MS's implementation of STL does not support container of a
class defined within another class. For example,

#include <vector>

using namespace std;

class X
{
public:
    class Y
    {
        int i;
    public:
        Y(): i(0) {}
    };

    vector<Y> vy;

Study.obj - 2 error(s), 0 warning(s)

But the same code works fine with HP/SGI's STL.
Does SP3 fix the problem? Or can anyone supply a solution? Thanks a lot.

-Jack

FYI, the source code of <vector> where the error happens is as follows:
template<class _Ty, class _A = allocator<_Ty> >
    class vector {
public:
    ...
    void resize(size_type _N, const _Ty& _X = _Ty())
                                              ^^^^^
    {if (size() < _N)
        insert(end(), _N - size(), _X);
     else if (_N < size())
             erase(begin() + _N, end()); }

My guess is the default argument _X = _Ty() is the problem.

Hi,

This is a bug in MSVC++.  I reported it to Microsoft a while ago, but I
haven't heard anything back from them (surprise, surprise).  A similar thing
will happen with namespaces, but you can work around that with "using
namespace blah;"

I'm using SP1, I don't think that SP3 fixes it though.  I'd like to be
wrong.

Regards,

Jan Mikkelsen

I have VC5 with SP3 and it looks like it compiles just fine. I copy and
pasted the code you have given and it compiled without any complaints. It
looks like it has been fixed in SP3. Try it out.

--
Girish Bharadwaj  [VC++/MVP]
Please don't send email queries.Post them here.
MS Knowledge base articles : http://support.microsoft.com/support

|Hi,
|
|This is a bug in MSVC++.  I reported it to Microsoft a while ago, but I
|haven't heard anything back from them (surprise, surprise).  A similar
thing
|will happen with namespaces, but you can work around that with "using
|namespace blah;"
|
|I'm using SP1, I don't think that SP3 fixes it though.  I'd like to be
|wrong.
|
|Regards,
|
|Jan Mikkelsen

|
|
|>Hello.
|>
|>I'm porting some C++ code from Solaris to NT, using MSVC++ 5.0 w/o SP3.
|>It seems that MS's implementation of STL does not support container of a
|>class defined within another class. For example,
|>
|>#include <vector>
|>
|>using namespace std;
|>
|>class X
|>{
|>public:
|>    class Y
|>    {
|>        int i;
|>    public:
|>        Y(): i(0) {}
|>    };
|>
|>    vector<Y> vy;
|>};
|>
|>which results in the following compilation error:
|>--------------------Configuration: Study - Win32
|>Debug--------------------
|>Compiling...
|>Study.cpp
|>C:\Program Files\DevStudio\VC\INCLUDE\vector(103) : error C2065: 'Y' :
|>undeclared identifier
|>C:\Program Files\DevStudio\VC\INCLUDE\vector(103) : error C2440:
|>'default argument' : cannot  convert from 'int' to 'const class X::Y &'
|>Reason: cannot convert from 'int' to 'const class X::Y'
|>No constructor could take the source type, or constructor overload
|>resolution was ambiguous
|>Error executing cl.exe.
|>
|>Study.obj - 2 error(s), 0 warning(s)
|>
|>But the same code works fine with HP/SGI's STL.
|>Does SP3 fix the problem? Or can anyone supply a solution? Thanks a lot.
|>
|>-Jack
|>
|>FYI, the source code of <vector> where the error happens is as follows:
|>template<class _Ty, class _A = allocator<_Ty> >
|>    class vector {
|>public:
|>    ...
|>    void resize(size_type _N, const _Ty& _X = _Ty())
|>                                              ^^^^^
|>    {if (size() < _N)
|>        insert(end(), _N - size(), _X);
|>     else if (_N < size())
|>             erase(begin() + _N, end()); }
|>
|>My guess is the default argument _X = _Ty() is the problem.
|>
|
|