optional.h File Reference

POD-safe optional<T> with raw storage. More...

#include "jh/pods/pod_like.h"
#include <new>
#include <cstddef>
#include <cstring>
#include <memory>

Go to the source code of this file.

Classes
struct	jh::pod::optional< T >
	POD-compatible optional wrapper. More...

Namespaces
namespace	jh::pod
	Aggregated entry point for Plain-Old-Data and layout-stable value utilities.

Functions
template<pod_like T>
constexpr optional< T >	jh::pod::make_optional (const T &value) noexcept
	Construct an optional<T> with a value.

Detailed Description

POD-safe optional<T> with raw storage.

Copyright

Copyright 2025 JeongHan-Bae <mastropseudo@gmail.com>
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

Full license: GitHub

Design Goals:

• Strict POD semantics (pod_like required)
• Raw byte buffer + 1 flag, no constructors or destructors
• Safe in pod::array, serialization, and mmap'd memory
• ABI predictable (sizeof(optional<T>) == sizeof(T) + 1)

Note

Unlike std::optional, this type never runs constructors or destructors.

Functions rely on reinterpret_cast/std::launder and therefore cannot be used in consteval contexts.