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-rw-r--r--nihil.guard/guard.ccm41
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-// This source code is released into the public domain.
-export module nihil.guard;
-
-import nihil.std;
-
-namespace nihil {
-
-// guard: invoke a callable when this object is destroyed; this is similar to
-// scope_exit from the library fundamentals TS, which LLVM doesn't implement.
-export template<std::invocable F>
-struct guard final {
- // Initialise the guard with a callable we will invoke later.
- explicit guard(F func) : m_func(std::move(func)) {}
-
- // We are being destroyed, so call the callable.
- // If the callable throws, std::terminate() will be called.
- ~guard()
- {
- if (m_func)
- std::invoke(*m_func);
- }
-
- // Release the guard. This turns the destructor into a no-op.
- auto release(this guard &self) noexcept -> void
- {
- self.m_func.reset();
- }
-
- // Not default-constructible, movable or copyable.
- guard() = delete;
- guard(guard const &) = delete;
- guard(guard &&) noexcept = delete;
- auto operator=(this guard &, guard const &) -> guard & = delete;
- auto operator=(this guard &, guard &&) noexcept -> guard & = delete;
-
-private:
- // The callable to be invoked when we are destroyed.
- std::optional<F> m_func;
-};
-
-} // namespace nihil