std::shared_ptr::reset

Parameters

p

Pointer whose ownership is taken over by the object.
Generally, this pointer should not be already managed by any other managed pointer (i.e., this value should not come from calling member get on a managed pointer).
U* shall be implicitly convertible to T* (where T is shared_ptr's template parameter).

del

Deleter object to be used to release the owned object.
This shall be a callable object taking a pointer to T as argument for its functional call (where T is shared_ptr's template parameter).

alloc

Allocator object used to allocate/deallocate internal storage.

Return value

Example

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19

// shared_ptr::reset example
#include <iostream>
#include <memory>
int main () {
  std::shared_ptr<int> sp;  // empty
  sp.reset (new int);       // takes ownership of pointer
  *sp=10;
  std::cout << *sp << '\n';
  sp.reset (new int);       // deletes managed object, acquires new pointer
  *sp=20;
  std::cout << *sp << '\n';
  sp.reset();               // deletes managed object
  return 0;
}

10
20

See also

shared_ptr::operator=

shared_ptr assignment (public member function)

make_shared

Make shared_ptr (function template)