text: std::unique_ptr::release
  From cppreference.com
  < cpp | memory | unique ptr
  Releases the ownership of the managed object if any. get() returns nullptr after the call.
  [edit] Parameters
  (none)
  [edit] Return value
  Pointer to the managed object or nullptr if there was no managed object, i.e. the value which would be returned by get() before the call.
  [edit] Exceptions
  [edit] Example
  Run this code
  #include <memory> #include <iostream> #include <cassert> struct Foo { Foo() { std::cout << "Foo\n"; } ~Foo() { std::cout << "~Foo\n"; } }; int main() { std::cout << "Creating new Foo...\n"; std::unique_ptr<Foo> up(new Foo()); std::cout << "About to release Foo...\n"; Foo* fp = up.release(); assert (up.get() == nullptr); std::cout << "Foo is no longer owned by unique_ptr...\n"; delete fp; }
  Output:
  Creating new Foo... Foo About to release Foo... Foo is no longer owned by unique_ptr... ~Foo