I'm getting:
error: default argument for template parameter for class enclosing 'ticker<T, E, A>::garbage_element'
51 | E ticker<T,E,A> ::garbage_element;
| ^~~~~~~~~~~~~~~
l know if I use the keyword "inline" like this:
inline static E garbage_element;
inside the "ticker" template, it compiles fine, but how in the world it suppose to look like outside the template.
#include <iostream>
#include <vector>
template< template<class, class> class T, class E, class A = std::allocator<E> >
class ticker
{
T<E,A>* container;
int current_index;
bool mode;
static E garbage_element;
public:
// constructors and members fn
};
template< template<class, class> class T, class E, class A = std::allocator<E> >
E ticker<T,E,A> ::garbage_element;
When defining the static data member of a class template which has a default argument for one of its template parameter, the default argument should not be repeated. It is needed only once when the class template is first declared/defined.
This means you don't need to specify the default argument for parameter A when defining the member garbage_element outside the class as shown below:
//-------------------------------------------------------v-->no default argument here
template<template<class, class> class T, class E, class A>
E ticker<T,E,A>::garbage_element;