1 files changed, 75 insertions, 0 deletions
diff --git a/src/core/common.h b/src/core/common.h
new file mode 100644
index 0000000..a06c238
--- /dev/null
+++ b/src/core/common.h
@@ -0,0 +1,75 @@
+#pragma once
+
+#include <cstdint>
+#include <memory>
+#include <optional>
+#include <utility>
+
+namespace saw {
+
+#define SAW_CONCAT_(x, y) x##y
+#define SAW_CONCAT(x, y) SAW_CONCAT_(x, y)
+#define SAW_UNIQUE_NAME(prefix) SAW_CONCAT(prefix, __LINE__)
+
+#define SAW_FORBID_COPY(classname)                                             \
+	classname(const classname &) = delete;                                     \
+	classname &operator=(const classname &) = delete
+
+#define SAW_FORBID_MOVE(classname)                                             \
+	classname(classname &&) = delete;                                          \
+	classname &operator=(classname &&) = delete
+
+#define SAW_DEFAULT_COPY(classname)                                            \
+	classname(const classname &) = default;                                    \
+	classname &operator=(const classname &) = default
+
+#define SAW_DEFAULT_MOVE(classname)                                            \
+	classname(classname &&) = default;                                         \
+	classname &operator=(classname &&) = default
+
+// In case of C++20
+#define SAW_ASSERT(expression)                                                 \
+	assert(expression);                                                        \
+	if (!(expression)) [[unlikely]]
+
+template <typename T> using maybe = std::optional<T>;
+
+template <typename T> using own = std::unique_ptr<T>;
+
+template <typename T> using our = std::shared_ptr<T>;
+
+template <typename T> using lent = std::weak_ptr<T>;
+
+template <typename T, class... Args> own<T> heap(Args &&...args) {
+	return own<T>(new T(std::forward<Args>(args)...));
+}
+
+template <typename T, class... Args> our<T> share(Args &&...args) {
+	return std::make_shared<T>(std::forward<Args>(args)...);
+}
+
+template <typename T> T instance() noexcept;
+
+template <typename Func, typename T> struct return_type_helper {
+	typedef decltype(instance<Func>()(instance<T>())) Type;
+};
+template <typename Func> struct return_type_helper<Func, void> {
+	typedef decltype(instance<Func>()()) Type;
+};
+
+template <typename Func, typename T>
+using return_type = typename return_type_helper<Func, T>::Type;
+
+struct void_t {};
+
+template <typename T> struct void_fix { typedef T Type; };
+template <> struct void_fix<void> { typedef void_t Type; };
+template <typename T> using fix_void = typename void_fix<T>::Type;
+
+template <typename T> struct void_unfix { typedef T Type; };
+template <> struct void_unfix<void_t> { typedef void Type; };
+template <typename T> using unfix_void = typename void_unfix<T>::Type;
+
+template <typename... T> constexpr bool always_false = false;
+
+} // namespace saw