std::unique_ptr::operator<<
cppreference.com
<tbody>
</tbody>
template <class CharT, class Traits, class Y, class D> std::basic_ostream<CharT, Traits>& operator<<(std::basic_ostream<CharT, Traits>& os, const std::unique_ptr<Y, D>& p); |
(since C++20) | |
Inserts the value of the pointer managed by p into the output stream os.
Equivalent to os << p.get().
This overload participates in overload resolution only if os << p.get() is a valid expression.
Parameters
| os | - | a std::basic_ostream to insert p into
|
| p | - | the pointer to be inserted into os
|
Return value
os
Notes
If std::unique_ptr<Y, D>::pointer is a pointer to a character type (e.g., when Y is char or char[] or CharT), this may end up calling the overloads of operator<< for null-terminated character strings (causing undefined behavior if the pointer does not in fact point to such a string), rather than the overload for printing the value of the pointer itself.
Example
코드 실행
#include <iostream>
#include <memory>
class Foo {};
int main()
{
auto p = std::make_unique<Foo>();
std::cout << p << '\n';
std::cout << p.get() << '\n';
}
Possible output:
0x6d9028
0x6d9028
See also
| returns a pointer to the managed object (public member function) |