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Matthias Hofmann
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 Posted: Wed Aug 02, 2006 2:44 am Post subject: Using the typename keyword |
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Hello everybody!
The typename keyword still confuses me, so I went through section 14.6 of
the standard and now I am pretty sure that the typename keyword is required
twice in the following example:
template <class T> std::vector<typename T::value_type> f( const T& x )
{
return std::vector<typename T::value_type>( x.begin(), x.end() );
}
However, I am not absolutely sure, so please have a look at the function
template above and tell me whether the use of the typename keyword is
correct. Thanks in advance,
--
Matthias Hofmann
Anvil-Soft, CEO
http://www.anvil-soft.com - The Creators of Toilet Tycoon
http://www.anvil-soft.de - Die Macher des Klomanagers
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
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W. J. La Cholter
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| Posted: Wed Aug 02, 2006 5:48 am Post subject: Re: Using the typename keyword |
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"Matthias Hofmann" <hofmann@anvil-soft.com> wrote in
news:44cfb863$0$24887$9b4e6d93 (AT) newsread4 (DOT) arcor-online.net:
| Quote: | The typename keyword still confuses me, so I went through section 14.6
of the standard and now I am pretty sure that the typename keyword is
required twice in the following example:
template <class T> std::vector<typename T::value_type> f( const T& x )
{
return std::vector<typename T::value_type>( x.begin(), x.end() );
}
However, I am not absolutely sure, so please have a look at the
function template above and tell me whether the use of the typename
keyword is correct. Thanks in advance,
|
Yes, it is correct. T::value_type is a dependent name, i.e., it's
resolution depends on the definition of T, and therefore requires the
typename keyword.
[ See http://www.gotw.ca/resources/clcm.htm for info about ]
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