default_delete

Overview

default_delete is a functor object. aka deleter  object used by smart pointers to recycle the resources.

Details

default_delete is a functor object. aka deleter  object. It's provided by std library to delete the resources managed by the smartpointers  when it's destroyed. It can be used to delete both a array type or pointer type resource. The smartpointers can also provide a custom deleter object.

Syntax

template <class T> class default_delete
//specialization for arrays
template <class T> class default_delete<T[]>

Constructors

Name	Description
default_delete()	Default constructor. Does nothing.
template <class U, class = typename enable_if<is_convertible<U*,T*>::value>::type>  default_delete (const default_delete<U>& del)	Constructs a default_delete<T> object from another default_delete object. This overload participates in overload resolution only if U* is implicitly convertible to T*. Example unique_ptr<int> (new int, default_delete<int>());
template <class U, class = typename enable_if<is_convertible<U*[],T*[]>::value>::type>  default_delete (const default_delete<U[]>& del)	Same as above except specialization for []. Example unique_ptr<int[]> (new int[10], default_delete<int[]>());

Methods

Name	Description
void operator() (T* ptr)	The  default_delete<T> internally calls delete ptr.  However this can be overridden by a specialization for a different  operation as shown below. Example template<> struct std::default_delete<FILE> { void operator()(FILE *fp) { fclose(fp); } }; FILE *fp = fopen("a.txt", "wt"); unique_ptr<FILE> ufp(fp);
template< class U > void operator() ( U* ptr)	Array specialization. Calls delete delete[] ptr.