std::unique_ptr<T,Deleter>::operatorbool (3) - Linux Manuals

std::unique_ptr<T,Deleter>::operatorbool: std::unique_ptr<T,Deleter>::operatorbool

NAME

std::unique_ptr<T,Deleter>::operatorbool - std::unique_ptr<T,Deleter>::operatorbool

Synopsis

explicit operator bool() const noexcept; (since C++11)

Checks whether *this owns an object, i.e. whether get() != nullptr.

Parameters

(none)

Return value

true if *this owns an object, false otherwise.

Example

// Run this code

  #include <iostream>
  #include <memory>

  int main()
  {
      std::unique_ptr<int> ptr(new int(42));

      if (ptr) std::cout << "before reset, ptr is: " << *ptr << '\n';
      ptr.reset();
      if (ptr) std::cout << "after reset, ptr is: " << *ptr << '\n';
  }

Output:

  before reset, ptr is: 42