Re: ostream_iterator and the delimiter before the item
* ShaunJ:
I often need to output a list with a delimiter (such as a tab or a
comma) before the item rather than after (which is where the end-of-
line will go). ostream_iterator puts the delimiter after the item. Is
there a simple solution for creating an ostream_iterator that puts the
delimiter before the item?
If I do it in a for loop, it's easy, of course. But the function I'm
calling takes an output iterator parameter, and to use a for loop I
would have to store all the results in a list first, which would take
a bunch of memory and is totally unnecessary.
class TabbedIntIter
{
private:
std::ostream* pMyStream;
public:
typedef char char_type;
typedef std::ostream ostream_type;
typedef std::ostream::traits_type traits_type;
TabbedIntIter( std::ostream& stream )
: pMyStream( &stream )
{}
TabbedIntIter& operator*() { return *this; }
TabbedIntIter& operator++() { return *this; }
TabbedIntIter& operator=( int x )
{
(*pMyStream) << '\t' << x;
return *this;
}
};
int main()
{
foo( TabbedIntIter( std::cout ) );
}
Cheers & hth.,
- Alf
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