Re: map::data_type missing in gcc 4 ?

[FÖLDY Lajos]

On Thu, 6 Dec 2007, vheinitz wrote:

> Hello,
> I am porting code which was compiling on gcc 3.2.2 to gcc 4
> I am using (GCC) 4.1.2 20061115 (prerelease) (SUSE Linux)
> Looks like std::map hasn't typedef data_type whereas map::key_type is
> still there.
>
> SGI's implementation seems to provide map::data_type
>
> Is there any other way to get data_type from std::map?
>
> P.S.: Code I have to port has sth. like this:
> template<typename T>
> T::data_type GetSomeDataFromMap( T m )
> {
>   return m[0];
> }

std::map::mapped_type

regards,
lajos


GCC 4.1.2 source code:

template <typename _Key, typename _Tp, typename _Compare = std::less<_Key>,
          typename _Alloc = std::allocator<std::pair<const _Key, _Tp> > >
    class map
    {
    public:
      typedef _Key                                key_type;
      typedef _Tp                                 mapped_type;
      typedef std::pair<const _Key, _Tp>          value_type;
      typedef _Compare                            key_compare;
      typedef _Alloc                              allocator_type;


SGI STL source code:

template <class _Key, class _Tp, class _Compare, class _Alloc>
class map {
public:

// requirements:

  __STL_CLASS_REQUIRES(_Tp, _Assignable);
  __STL_CLASS_BINARY_FUNCTION_CHECK(_Compare, bool, _Key, _Key);

// typedefs:

  typedef _Key                  key_type;
  typedef _Tp                   data_type;
  typedef _Tp                   mapped_type;
  typedef pair<const _Key, _Tp> value_type;
  typedef _Compare              key_compare;