We have an reference_counted
template and an default default_deallocator
class as following:
template <class T>
class default_deallocator {
void operator()(T* obj) {
delete obj;
}
};
template <class T>
class reference_counted: T
{
public:
void retain() {ref_count++;}
void release() {
ref_count --;
if (ref_count == 0) {
delete this;
}
}
}
We want to add the deallocator for the reference_counted
class. But we don't know how to write the default template argument, because the compiler will complain about recursive type reference.
//VS2015 says: fatal error C1202: recursive type or function dependency context too complex
template <class T, class D = default_deallocator<reference_counted<T>>> <---
class reference_counted: T
{
public:
void retain() {ref_count++;}
void release() {
ref_count --;
if (ref_count == 0) {
D deallocator;
deallocator.operator()(this);
}
}
}
I understand this error. So the question is how to reference current class type in template default argument or other way to implement this design pattern?
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