id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
1262	[Boost.Iterators] Reasoning for boost::pointee<> not supporting back_insert_iterator?	Richard Hazlewood <richard@…>	Dave Abrahams	"The C++ Standard specifies that ''std::back_insert_iterator'' does not pass the ''value_type'' down to the base output-iterator class.  This means (by default) that the ''value_type'' is typed to ''void'' and thus unsuitable for ''boost::pointee'' to determine the value type.

E.g.:
{{{
typedef std::vector<int> Ints; 
typedef std::back_insert_iterator<Ints> Iter; 
typedef boost::pointee<Iter>::type IntType; // Errors
}}}

The following specialization can be used to support ''back_insert_iterator'':
{{{
namespace boost 
{ 
    template <class T> 
    struct pointee<std::back_insert_iterator<T> > 
    { 
        typedef typename T::value_type type; 
    }; 
}
}}}

Is there a particular reasoning why this is not available in the library?

Note: this also applies to ''std::front_insert_iterator''.
"	Feature Requests	closed	To Be Determined	iterator	Boost 1.34.1	Problem	wontfix	pointee iterator back_insert_iterator