class state_holder<T, true> filter¶

constexpr state_holder()                        = delete

constexpr state_holder(const state_holder&)     = default

constexpr state_holder(state_holder&&)          = default

constexpr state_holder(T state) noexcept        = delete

constexpr state_holder(const T& state) noexcept = delete

constexpr state_holder(T& state) noexcept       = delete

constexpr state_holder(T&& state) noexcept      = delete

constexpr state_holder(std::reference_wrapper<T> state) noexcept : s(&state.get()) { … }

T* s

const T* operator->() const

T* operator->()

const T& operator*() const

T& operator*()