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std::unique_ptr::operator bool

explicit operator bool() const;

(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.

Exceptions

noexcept specification:

noexcept

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

See also

get	returns a pointer to the managed object (public member function)

Links:

http://en.cppreference.com/w/cpp/memory/unique_ptr/operator_bool

doc_CPP

2016-10-11 10:07:45

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