Re: templates in code
Taras_96 wrote:
I found the following piece of code on the net and just wanted to
check whether I understood it correctly:
std::transform( s.begin(), s.end(), s.begin(),
std::bind1st( std::mem_fun( &std::ctype<char>::tolower ),
&std::use_facet< std::ctype<char> >( loc ) ) );
ctype<char>: is this implying that ctype is a templated class?
Yes.
so std::ctype<char>::tolower translates to:
the tolower member function of the ctype<char> class in the std name
space?
Yes.
also:
std::use_facet< std::ctype<char> >( loc )
it seems that the type of the return argument for use_facet has been
explicitly specified by <std::ctype<char> > - is this correct?
Yes.
Again,
is std::ctype<char> referencing a char instance of the ctype templated
class?
I don't think the expression "a char instance of" is idiomatic, but it
is not completely incomprehensible. And, again, yes.
It seems that this is correct when the definition of the use_facet
function is inspected:
template <class Facet>
Facet const& use_facet(locale const& loc);
I believe you've got it right.
V
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