std::optional<T>:: ~optional
|
|
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Member functions | ||||
|
optional::~optional
|
||||
| Observers | ||||
| Iterators | ||||
|
(C++26)
|
||||
|
(C++26)
|
||||
| Monadic operations | ||||
|
(C++23)
|
||||
|
(C++23)
|
||||
|
(C++23)
|
||||
| Modifiers | ||||
| Non-member functions | ||||
| Deduction guides | ||||
| Helper classes | ||||
| Helper objects | ||||
|
~optional
(
)
;
|
(since C++17)
(constexpr since C++20) |
|
If the object contains a value and the type
T
is not trivially destructible (see
std::is_trivially_destructible
), destroys the contained value by calling its destructor, as if by
value
(
)
.
T
::
~T
(
)
.
Otherwise, does nothing.
Notes
If
T
is trivially-destructible, then this destructor is also trivial, so
std::
optional
<
T
>
is also trivially-destructible.
| Feature-test macro | Value | Std | Feature |
|---|---|---|---|
__cpp_lib_optional
|
202106L |
(C++20)
(DR20) |
Fully constexpr |
Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
| DR | Applied to | Behavior as published | Correct behavior |
|---|---|---|---|
| P2231R1 | C++20 | the destructor was not constexpr while non-trivial destructors can be constexpr in C++20 | made constexpr |