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Prateek R Karandikar
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 Posted: Tue Apr 13, 2004 4:50 pm Post subject: Why are template typedefs not allowed? |
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Why are template typedefs not allowed? In the absence of this, we have
to unnecessarily use a struct (or a class or a union) to scope the
typedef. Had
template typedefs been allowed, we could have written:
template<typename T>
class allocator
{
public:
//...
template<typename U> typedef allocator<U> rebind;
};
template <typename T, typename A=allocator
class list
{
//here, typename A::template rebind<_Link> would be a type, provided
_Link is a type
//...
};
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Pete Vidler
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| Posted: Tue Apr 13, 2004 10:32 pm Post subject: Re: Why are template typedefs not allowed? |
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Prateek R Karandikar wrote:
| Quote: | Why are template typedefs not allowed? In the absence of this, we have
to unnecessarily use a struct (or a class or a union) to scope the
typedef.
[snip] |
I'm fairly certain it was an oversight. I believe we will get them with
the next standard.
Check out:
http://www.gotw.ca/publications/N1406.pdf
http://www.cuj.com/experts/2012/sutter.htm
I can't seem to access the second one ATM, though.
-- Pete
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Francis Glassborow
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| Posted: Wed Apr 14, 2004 6:09 am Post subject: Re: Why are template typedefs not allowed? |
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In article <l1Vec.147$xN.1 (AT) newsfe1-gui (DOT) server.ntli.net>, Pete Vidler
<pvidler (AT) mailblocks (DOT) com> writes
| Quote: | Prateek R Karandikar wrote:
Why are template typedefs not allowed? In the absence of this, we have
to unnecessarily use a struct (or a class or a union) to scope the
typedef.
[snip]
I'm fairly certain it was an oversight. I believe we will get them with
the next standard.
|
No, not an oversight; deciding exactly what a template typedef should be
is far from trivial as we have found when considering proposals to
introduce them to the language.
--
Francis Glassborow ACCU
Author of 'You Can Do It!' see http://www.spellen.org/youcandoit
For project ideas and contributions: http://www.spellen.org/youcandoit/projects
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