Re: A strange problem of template
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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