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Diffstat (limited to 'nihil.generator/manual_lifetime.ccm')
| -rw-r--r-- | nihil.generator/manual_lifetime.ccm | 114 |
1 files changed, 0 insertions, 114 deletions
diff --git a/nihil.generator/manual_lifetime.ccm b/nihil.generator/manual_lifetime.ccm deleted file mode 100644 index 44bc0a8..0000000 --- a/nihil.generator/manual_lifetime.ccm +++ /dev/null @@ -1,114 +0,0 @@ -/////////////////////////////////////////////////////////////////////////////// -// Reference implementation of std::generator proposal P2168. -// -// See https://wg21.link/P2168 for details. -// -/////////////////////////////////////////////////////////////////////////////// -// Copyright Lewis Baker, Corentin Jabot -// -// Use, modification and distribution is subject to the Boost Software License, -// Version 1.0. -// (See accompanying file LICENSE or http://www.boost.org/LICENSE_1_0.txt) -/////////////////////////////////////////////////////////////////////////////// - -export module nihil.generator:manual_lifetime; - -import nihil.std; - -namespace nihil { - -template <typename T> -struct manual_lifetime { - manual_lifetime() noexcept {} - ~manual_lifetime() {} - - template <typename ...Args> - auto construct(this manual_lifetime &self, Args && ...args) - noexcept(std::is_nothrow_constructible_v<T, Args...>) - -> T & - { - return *::new (static_cast<void*>(std::addressof(self.m_value))) - T(static_cast<Args &&>(args)...); - } - - void destruct(this manual_lifetime &self) - noexcept(std::is_nothrow_destructible_v<T>) - { - self.m_value.~T(); - } - - auto get(this manual_lifetime &self) noexcept -> T & - { - return self.m_value; - } - - auto get(this manual_lifetime &&self) noexcept -> T && - { - return static_cast<T&&>(self.m_value); - } - - auto get(this manual_lifetime const &self) noexcept -> T const & - { - return self.m_value; - } - - auto get(this manual_lifetime const &&self) noexcept -> T const && - { - return static_cast<T const &&>(self.m_value); - } - -private: - union { - std::remove_const_t<T> m_value; - }; -}; - -template <typename T> -struct manual_lifetime<T &> { - manual_lifetime() noexcept = default; - ~manual_lifetime() = default; - - auto construct(this manual_lifetime &self, T &value) noexcept -> T & - { - self.m_value = std::addressof(value); - return value; - } - - auto destruct(this manual_lifetime &) noexcept -> void - { - } - - auto get(this manual_lifetime const &self) noexcept -> T & - { - return *self.m_value; - } - -private: - T *m_value = nullptr; -}; - -template <typename T> -struct manual_lifetime<T &&> { - manual_lifetime() noexcept = default; - ~manual_lifetime() = default; - - auto construct(this manual_lifetime &self, T &&value) noexcept -> T && - { - self.m_value = std::addressof(value); - return static_cast<T &&>(value); - } - - void destruct(this manual_lifetime &) noexcept - { - } - - auto get(this manual_lifetime const &self) noexcept -> T && - { - return static_cast<T &&>(*self.m_value); - } - -private: - T* m_value = nullptr; -}; - -} |
