Re: A strange problem of template

From:

"Victor Bazarov" <v.Abazarov@comAcast.net>

Newsgroups:

comp.lang.c++

Date:

Wed, 18 Jul 2007 16:19:30 -0400

Message-ID:

<f7lskg$su6$1@news.datemas.de>

Zheng Da wrote:

Victor Bazarov wrote:

Zheng Da wrote:

I want a use the class of map in a class with template,
and the type of elements in map is specified by the parameter of the
class's template.
For example,
template <typename key, typename T>
class hashmap
{
map<key , T> table;
public:
void find(const key &k){
map<key,T>::iterator it=table.find(k); <=the error
}
};

int main()
{
hashmap<int,int> hm;
}

When I compile it, I get the error
test.cc:33: error: expected `;' before 'it'
I don't get it. Why I can use map in this class, but I can't define
its iterator?

Read up on 'typename' keyword and where it's supposed to be used.
(Hint: there are FAQ entires that have it and there is more than one
use of that keyword)

V

I'm sorry, I really didn't find the solution.
You mean http://www.parashift.com/c++-faq-lite/templates.html?
I didn't find the similar question there.
I tried to use 'typename' as keyword to search c++ faq, and still
didn't find the similar questions.

You know what, I don't want to prove you wrong or prove myself wrong.
Just do

typename map<key,T>::iterator it = ...

And get a decent book on C++ templates that explains the need for the
'typename' keyword, OK?

V
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