add Chapter18
This commit is contained in:
Amar Mahmutbegovic
248
Chapter18/cib/libs/stdx/utility.hpp
Normal file
248
Chapter18/cib/libs/stdx/utility.hpp
Normal file
@@ -0,0 +1,248 @@
|
||||
#pragma once
|
||||
|
||||
#include <stdx/compiler.hpp>
|
||||
#include <stdx/concepts.hpp>
|
||||
#include <stdx/type_traits.hpp>
|
||||
|
||||
#include <cstddef>
|
||||
#include <cstdint>
|
||||
#include <type_traits>
|
||||
#include <utility>
|
||||
|
||||
// NOLINTBEGIN(modernize-use-constraints)
|
||||
|
||||
namespace stdx {
|
||||
inline namespace v1 {
|
||||
|
||||
template <typename... Fs> struct overload : Fs... {
|
||||
using Fs::operator()...;
|
||||
};
|
||||
|
||||
#if __cpp_deduction_guides < 201907L
|
||||
template <typename... Fs> overload(Fs...) -> overload<Fs...>;
|
||||
#endif
|
||||
|
||||
[[noreturn]] inline auto unreachable() -> void { __builtin_unreachable(); }
|
||||
|
||||
namespace detail {
|
||||
template <auto V> struct value_t {
|
||||
constexpr static inline auto value = V;
|
||||
};
|
||||
} // namespace detail
|
||||
|
||||
template <typename K, typename V> struct type_pair {};
|
||||
template <typename K, typename V> using tt_pair = type_pair<K, V>;
|
||||
template <auto K, typename V> using vt_pair = tt_pair<detail::value_t<K>, V>;
|
||||
template <typename K, auto V> using tv_pair = tt_pair<K, detail::value_t<V>>;
|
||||
template <auto K, auto V>
|
||||
using vv_pair = tt_pair<detail::value_t<K>, detail::value_t<V>>;
|
||||
|
||||
template <typename... Ts> struct type_map : Ts... {};
|
||||
|
||||
namespace detail {
|
||||
template <typename K, typename Default>
|
||||
constexpr static auto lookup(...) -> Default;
|
||||
template <typename K, typename Default, typename V>
|
||||
constexpr static auto lookup(type_pair<K, V>) -> V;
|
||||
} // namespace detail
|
||||
|
||||
template <typename M, typename K, typename Default = void>
|
||||
using type_lookup_t = decltype(detail::lookup<K, Default>(std::declval<M>()));
|
||||
|
||||
template <typename M, auto K, typename Default = void>
|
||||
using value_lookup_t =
|
||||
decltype(detail::lookup<detail::value_t<K>, Default>(std::declval<M>()));
|
||||
|
||||
namespace detail {
|
||||
template <typename T>
|
||||
using is_not_void = std::bool_constant<not std::is_void_v<T>>;
|
||||
}
|
||||
|
||||
template <typename M, typename K, auto Default = 0>
|
||||
constexpr static auto type_lookup_v =
|
||||
type_or_t<detail::is_not_void,
|
||||
decltype(detail::lookup<K, void>(std::declval<M>())),
|
||||
detail::value_t<Default>>::value;
|
||||
|
||||
template <typename M, auto K, auto Default = 0>
|
||||
constexpr static auto value_lookup_v =
|
||||
type_or_t<detail::is_not_void,
|
||||
decltype(detail::lookup<detail::value_t<K>, void>(
|
||||
std::declval<M>())),
|
||||
detail::value_t<Default>>::value;
|
||||
|
||||
#if __cpp_lib_forward_like < 202207L
|
||||
template <typename T, typename U>
|
||||
[[nodiscard]] constexpr auto forward_like(U &&u) noexcept -> decltype(auto) {
|
||||
constexpr auto t_is_const = std::is_const_v<std::remove_reference_t<T>>;
|
||||
|
||||
if constexpr (std::is_lvalue_reference_v<T &&>) {
|
||||
if constexpr (t_is_const) {
|
||||
return std::as_const(u);
|
||||
} else {
|
||||
return (u);
|
||||
}
|
||||
} else {
|
||||
if constexpr (t_is_const) {
|
||||
return std::move(std::as_const(u));
|
||||
} else {
|
||||
return static_cast<U &&>(u);
|
||||
}
|
||||
}
|
||||
}
|
||||
#else
|
||||
using std::forward_like;
|
||||
#endif
|
||||
template <typename T, typename U>
|
||||
using forward_like_t = decltype(forward_like<T>(std::declval<U>()));
|
||||
|
||||
template <typename T, std::enable_if_t<std::is_integral_v<T>, int> = 0>
|
||||
[[nodiscard]] auto as_unsigned(T t) {
|
||||
static_assert(not std::is_same_v<T, bool>,
|
||||
"as_unsigned is not applicable to bool");
|
||||
return static_cast<std::make_unsigned_t<T>>(t);
|
||||
}
|
||||
|
||||
template <typename T, std::enable_if_t<std::is_integral_v<T>, int> = 0>
|
||||
[[nodiscard]] auto as_signed(T t) {
|
||||
static_assert(not std::is_same_v<T, bool>,
|
||||
"as_signed is not applicable to bool");
|
||||
return static_cast<std::make_signed_t<T>>(t);
|
||||
}
|
||||
|
||||
namespace detail {
|
||||
template <typename T, typename U>
|
||||
[[nodiscard]] constexpr auto size_conversion(std::size_t sz) -> std::size_t {
|
||||
if constexpr (sizeof(T) == sizeof(U)) {
|
||||
return sz;
|
||||
} else if constexpr (sizeof(T) > sizeof(U)) {
|
||||
return sz * (sizeof(T) / sizeof(U));
|
||||
} else {
|
||||
return (sz * sizeof(T) + sizeof(U) - 1) / sizeof(U);
|
||||
}
|
||||
}
|
||||
} // namespace detail
|
||||
|
||||
template <typename T> struct sized {
|
||||
template <typename U = std::uint8_t>
|
||||
[[nodiscard]] constexpr auto in() -> std::size_t {
|
||||
return detail::size_conversion<T, U>(sz);
|
||||
}
|
||||
|
||||
std::size_t sz;
|
||||
};
|
||||
|
||||
using sized8 = sized<std::uint8_t>;
|
||||
using sized16 = sized<std::uint16_t>;
|
||||
using sized32 = sized<std::uint32_t>;
|
||||
using sized64 = sized<std::uint64_t>;
|
||||
|
||||
namespace cxv_detail {
|
||||
struct from_any {
|
||||
// NOLINTNEXTLINE(google-explicit-constructor)
|
||||
template <typename... Ts> constexpr from_any(Ts const &...) {}
|
||||
// NOLINTNEXTLINE(google-explicit-constructor)
|
||||
constexpr operator int() const { return 0; }
|
||||
};
|
||||
|
||||
struct type_val {
|
||||
template <typename T, typename U,
|
||||
typename = std::enable_if_t<same_as_unqualified<type_val, U>>>
|
||||
friend constexpr auto operator+(T &&t, U &&) -> T {
|
||||
return t;
|
||||
}
|
||||
friend constexpr auto operator+(type_val const &f) -> type_val { return f; }
|
||||
// NOLINTNEXTLINE(google-explicit-constructor)
|
||||
template <typename T> constexpr operator T() const {
|
||||
extern auto cxv_type_val_get_t(T *) -> T;
|
||||
return cxv_type_val_get_t(nullptr);
|
||||
}
|
||||
};
|
||||
|
||||
template <int> constexpr auto is_type() -> std::false_type;
|
||||
template <typename> constexpr auto is_type() -> std::true_type;
|
||||
|
||||
template <typename> struct typer;
|
||||
template <typename T> struct typer<from_any(T)> {
|
||||
using type = T;
|
||||
};
|
||||
|
||||
template <int> constexpr auto type_of() -> void;
|
||||
template <typename T> constexpr auto type_of() -> typename typer<T>::type;
|
||||
|
||||
class cx_base {
|
||||
struct unusable {};
|
||||
|
||||
public:
|
||||
using cx_value_t [[maybe_unused]] = void;
|
||||
constexpr auto operator()(unusable) const {}
|
||||
};
|
||||
} // namespace cxv_detail
|
||||
|
||||
template <typename T>
|
||||
constexpr auto is_aligned_with = [](auto v) -> bool {
|
||||
static_assert(std::is_integral_v<decltype(v)> or
|
||||
std::is_pointer_v<decltype(v)>,
|
||||
"is_aligned_with should only be used with an integral or "
|
||||
"pointer argument!");
|
||||
constexpr auto mask = alignof(T) - 1u;
|
||||
if constexpr (std::is_pointer_v<decltype(v)>) {
|
||||
return (__builtin_bit_cast(std::uintptr_t, v) & mask) == 0;
|
||||
} else {
|
||||
return (static_cast<std::uintptr_t>(v) & mask) == 0;
|
||||
}
|
||||
};
|
||||
|
||||
#if __cplusplus >= 202002L
|
||||
|
||||
namespace detail {
|
||||
template <typename T> struct ct_helper {
|
||||
// NOLINTNEXTLINE(google-explicit-constructor)
|
||||
CONSTEVAL ct_helper(T t) : value(t) {}
|
||||
T value;
|
||||
};
|
||||
template <typename T> ct_helper(T) -> ct_helper<T>;
|
||||
} // namespace detail
|
||||
|
||||
template <detail::ct_helper Value> CONSTEVAL auto ct() {
|
||||
return std::integral_constant<decltype(Value.value), Value.value>{};
|
||||
}
|
||||
template <typename T> CONSTEVAL auto ct() { return type_identity<T>{}; }
|
||||
|
||||
#endif
|
||||
} // namespace v1
|
||||
} // namespace stdx
|
||||
|
||||
// NOLINTBEGIN(cppcoreguidelines-macro-usage)
|
||||
|
||||
#ifndef FWD
|
||||
#define FWD(x) std::forward<decltype(x)>(x)
|
||||
#endif
|
||||
|
||||
#ifndef CX_VALUE
|
||||
#define CX_VALUE(...) \
|
||||
[]() constexpr { \
|
||||
STDX_PRAGMA(diagnostic push) \
|
||||
STDX_PRAGMA(diagnostic ignored "-Wold-style-cast") \
|
||||
STDX_PRAGMA(diagnostic ignored "-Wunused-value") \
|
||||
if constexpr (decltype(stdx::cxv_detail::is_type< \
|
||||
stdx::cxv_detail::from_any( \
|
||||
__VA_ARGS__)>())::value) { \
|
||||
return stdx::overload{stdx::cxv_detail::cx_base{}, [] { \
|
||||
return stdx::type_identity< \
|
||||
decltype(stdx::cxv_detail::type_of< \
|
||||
stdx::cxv_detail::from_any( \
|
||||
__VA_ARGS__)>())>{}; \
|
||||
}}; \
|
||||
} else { \
|
||||
return stdx::overload{stdx::cxv_detail::cx_base{}, [] { \
|
||||
return (__VA_ARGS__) + \
|
||||
stdx::cxv_detail::type_val{}; \
|
||||
}}; \
|
||||
} \
|
||||
STDX_PRAGMA(diagnostic pop) \
|
||||
}()
|
||||
#endif
|
||||
|
||||
// NOLINTEND(cppcoreguidelines-macro-usage)
|
||||
// NOLINTEND(modernize-use-constraints)
|
||||
Reference in New Issue
Block a user