std::optional<T>::~optional
From cppreference.com
C++
Feature test macros (C++20)
Concepts library (C++20)
Metaprogramming library (C++11)
Ranges library (C++20)
Filesystem library (C++17)
Concurrency support library (C++11)
Execution control library (C++26)
Utilities library
Relational operators (deprecated in C++20) Integer comparison functions
Swap and type operations Common vocabulary types
Type support (basic types, RTTI)
Library feature-test macros (C++20)
(C++11)
(C++20)
(C++26)
(C++20)
Coroutine support (C++20)
Contract support (C++26)
(C++20)(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)
(C++20)(C++20)(C++20)
(C++20)(C++20)(C++20)
General utilities
(C++20)(C++20)(C++20)
(C++20)(C++20)(C++20)
(C++20)
std::optional
optional::~optional
(C++26)
(C++26)
(C++23)
(C++23)
(C++23)
~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.
[edit] 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 |
[edit] 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 |