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std::unique_ptr::operator bool

From cppreference.com
< cpp‎ | memory‎ | unique ptr
 
 
 
Dynamic memory management
Uninitialized storage
(C++17)
(deprecated since c++17)
(deprecated since c++17)
(deprecated since c++17)
Garbage collection support
Miscellaneous
(C++11)
(C++11)
C Library
Low level memory management
 
 
explicit operator bool() const;
(since C++11)

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

Contents

[edit] Parameters

(none)

[edit] Return value

true if *this owns an object, false otherwise.

[edit] Exceptions

noexcept specification:  
noexcept
  

[edit] Example

#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

[edit] See also

returns a pointer to the managed object
(public member function) [edit]