The above code compiles fine as it should be If I just uncomment the std::vector one it fires compilation errors sayingCode:template <typename T, typename CONT /*= std::vector*/ > struct Stack{ CONT elem; };But I don't find any syntactic or symantic error in the above code. can anybody please point it out.Code:error: expected type-specifier error: expected '>'
std::vector of what?
I am guessing that you actually want to write:
Code:template <typename T, typename CONT = std::vector<T> > struct Stack{ CONT elem; };
Look up a C++ Reference and learn How To Ask Questions The Smart WayOriginally Posted by Bjarne Stroustrup (2000-10-14)
std::vector is unspecialized.
std::vector<T> in specialized, thus
template <typename T, typename CONT = std::vector>
...does not work.
template < typename T, typename CONT = std::vector<T> >
...works.
and
template <typename T, template<typename> CONT = std::vector>
...also works.
Thanks all understood
I forgot that std::vector does not name a type rather std::vector<SOMETYPE> is a Typename (Silly mistake)
No, it doesn't. std::vector takes an unspecified number of template arguments, but at least 2.
All the buzzt!
CornedBee
"There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
- Flon's Law
What do you mean it takes an unspecified number of template arguments? How is that possible? Can you use the ... operator in template arguments?
As far as I can see, it just takes 2 arguments, one of which is defaulted.
"I am probably the laziest programmer on the planet, a fact with which anyone who has ever seen my code will agree." - esbo, 11/15/2008
"the internet is a scary place to be thats why i dont use it much." - billet, 03/17/2010
The standard says that the implementation may give the containers any number of template arguments after those specified by the standard, as long as they have defaults.
This, combined with disallowing the substitution of default arguments in template template parameters, has led to many unhappy users.
All the buzzt!
"There is not now, nor has there ever been, nor will there ever be, any programming language in which it is the least bit difficult to write bad code."
- Flon's Law
Tsch. Burned.
Oh well.
At least the second works.
