• Li Jie <cpunion gmail.com> Apr 18 2006
• Hasan Aljudy <hasan.aljudy gmail.com> Apr 18 2006
• Li Jie <cpunion gmail.com> Apr 19 2006

Li Jie <cpunion gmail.com> writes:

I don't know what is the name of this usage:

template <class T> class SomeClass{};
template <class T, class U> class SomeClass< AnotherClass<T,U> >{};

I think this is very commonly used, but D hasn't supported it yet, Is it in the
plain?

- Li Jie

Hasan Aljudy <hasan.aljudy gmail.com> writes:

Li Jie wrote:
 I don't know what is the name of this usage:
 
 template <class T> class SomeClass{};
 template <class T, class U> class SomeClass< AnotherClass<T,U> >{};
 
 I think this is very commonly used, but D hasn't supported it yet, Is it in the
 plain?
 
 - Li Jie
 
 


Are you sure? I just tried, and the following works:

	class SomeClass(T)
	{
		T x;
	}
	
	template AnotherClass(T,U)
	{
		class AnotherClass( SomeClass(T) )
		{
		}
	}
	
	void main()
	{
	}

Li Jie <cpunion gmail.com> writes:

In article <e24ltq$2g7f$1 digitaldaemon.com>, Hasan Aljudy says...
Li Jie wrote:
 I don't know what is the name of this usage:
 
 template <class T> class SomeClass{};
 template <class T, class U> class SomeClass< AnotherClass<T,U> >{};
 
 I think this is very commonly used, but D hasn't supported it yet, Is it in the
 plain?
 
 - Li Jie
 
 


Are you sure? I just tried, and the following works:

	class SomeClass(T)
	{
		T x;
	}
	
	template AnotherClass(T,U)
	{
		class AnotherClass( SomeClass(T) )
		{
		}
	}
	
	void main()
	{
	}


Oh. It's different.

// c++ version:
# template <class T>
# class SomeClass {
#   public: typedef int some_type;
# };
# 
# template <class T, class U> 
# class SomeClass< map<T,U> > {
#   public: typedef short some_type;
# };
# 
# template <class T>
# class SomeClass< map<int, T> > {
#   public: typedef char some_type;
# }
# 
# int main() {
#   SomeClass<int>::some_type a; // int type
#   SomeClass< map<short, int> >::some_type b; // short type
#   SomeClass< map<int,short> >::some_type c; // char type
#   return 0;
# }

That looks like "implicit template parameters type deduce" + "template
specialization". How to do it in D? static if?