Re: [Boost-users] Boost utility to get const value_type for const std containers?

5 Jul 2010


      On Jul 5, 2010, at 2:50 PM, Mostafa wrote:
...
On Mon, 05 Jul 2010 14:35:58 -0700, Marshall Clow  wrote:
...
On Jul 5, 2010, at 2:10 PM, Mostafa wrote:
...
Hi all,
Is there a boost utility that will return the "correct" value_type for std containers? i.e., for:
typedef std::vector<char> const CharVector;
is there SomeBoostUtility<CharVector>::Type == char const ?
I don't know of one, but this should work:
template <class Container>
bool equal_to_string ( const Container &c, const typename Container::value_type *pFirst ) {
  return std::equal ( c.begin (), c.end (), pFirst );
}
Thanks, I was actually looking for something that will return either a const or non-const qualified value_type for the complimentary qualified container type. Something like this:
template <typename T>
struct StdContainerValue
{
   typedef typename T::value_type Type;
};
template <typename T>
struct StdContainerValue<T const>
{
   typedef typename T::value_type const Type;
};
Sorry --  I completely misread your posting.

-- Marshall