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#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
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