template class with static function

Question

i wanted to create a template class with a static function

template <typename T>
class Memory
{
 public:
  template < typename T>
  static <T>* alloc( int dim )
  {
    T *tmp = new T [ dim ];
    return tmp;
  };
}

but i will always get

int *a = Memory::alloc<int>(5)

i dont know what to chance..

 »template<class T> class Memory« used without template parameters
 expected primary-expression before »int«
 Fehler: expected »,« or »;« before »int«

@Tudor: Given that the OP has posted a compiler error message, presumably not! — Oliver Charlesworth
– Oliver Charlesworth, Commented Apr 28, 2012 at 12:55

Pubby · Accepted Answer · 2012-04-28 12:55:01Z

6

You're templating both the class and the function, when you likely only want to template one of them.

Is this what you mean?

template <typename T>
class Memory
{
 public:
  static T* alloc( int dim )
  {
    T *tmp = new T [ dim ];
    return tmp;
  };
}

int *a = Memory<int>::alloc(5);

Here's a correct version with both:

template <typename T>
class Memory
{
 public:
  template <typename U>
  static U* alloc( int dim )
  {
    U *tmp = new U [ dim ];
    return tmp;
  };
}

int *a = Memory<float>::alloc<int>(5);

You can remove the outer template if you just want the function to be templated.

answered Apr 28, 2012 at 12:55

Pubby

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2 Comments

Roby Over a year ago

ahh oki, so is it possible to make the funktion with template<typename T> static T* alloc ... ?

Pubby Over a year ago

@Roby I don't fully understand what you mean but I've updated the post with another example.

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