use of class template requires template argument list

Question

I moved out the methods implementation from my class and caught the following error:

use of class template requires template argument list 

for method whitch doesn't require template type at all... (for other methods all ok)

Class

template<class T> class MutableQueue { public:     bool empty() const;     const T& front() const;     void push(const T& element);     T pop();  private:     queue<T> queue;     mutable boost::mutex mutex;     boost::condition condition; }; 

Wrong implementation

template<>   //template<class T> also incorrect bool MutableQueue::empty() const {     scoped_lock lock(mutex);     return queue.empty(); } 

Answer 1

It should be:

template<class T> bool MutableQueue<T>::empty() const {     scoped_lock lock(mutex);     return queue.empty(); } 

And if your code is that short, just inline it, as you can't separate the implementation and header of a template class anyway.