How to get the data type from the template argument?

Dear All,

I have template classes as following

template<class T>
struct A
{
typedef T DataType;
DataType valueA;
};

template<class T>
struct B
{
T::DataType valueB;
}

When compiling, it said that T::DataType is not a type. Any method I
can get the data type from the template argument?

I appreciate your help.

Best wishes!

Shuisheng

"shuisheng" <shuisheng75@yahoo.comwrote in
news:1165535009.790154.125100@n67g2000cwd.googlegr oups.com:

Quote:

Dear All,
>
I have template classes as following
>
template<class T>
struct A
{
typedef T DataType;
DataType valueA;
};
>
template<class T>
struct B
{
T::DataType valueB;
}
>
When compiling, it said that T::DataType is not a type. Any method I
can get the data type from the template argument?
>
I appreciate your help.

That's what's called a dependant type. Use the 'typename' keyword:

template<class T>
struct B
{
typename T::DataType valueB;
}

How to get the data type from the template argument?

re: How to get the data type from the template argument?

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