Re: Why no std::back_insert_iterator::value_type?
Terry G ha scritto:
Sorry, I've been guilty of that on several posts recently. I'm in a hurry.
Here's some runnable code that illustrates my point.
It contains my previous code, that used a vector<MyType>, where MyType is
uint8_t.
I wanted to allow the user to use the container of her choice and a
reasonable type too.
Thats the "current" version.
Then, I show the code that I wish would work, but it doesn't because
value_type for back_inserter is void.
<code snipped>>
Much better! ;-)
Maybe this could be a solution:
template <class T>
struct true_value_type
{
typedef typename std::iterator_traits<T>::value_type type;
};
template <class T>
struct true_value_type<std::back_insert_iterator<T> >
{
typedef typename T::value_type type;
};
then you just use
template <class OutIter>
OutIter CopyOutWish(OutIter dst, const uint8_t* src, size_t size,
unsigned count)
{
typedef typename true_value_type<OutIter>::type DstType;
/* */
}
HTH,
Ganesh
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