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less compile-time and fix min/max

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This commit is contained in:
neargye 2019-10-15 16:10:49 +05:00
parent cff9399e28
commit 23fc75df57
1 changed files with 61 additions and 63 deletions
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124
include/nameof.hpp
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@ -364,15 +364,41 @@ inline constexpr auto enum_name_v = n<E, V>();
namespace enums {
template <typename E>
inline constexpr int reflected_min_v = static_cast<int>(enum_range<E>::min > (std::numeric_limits<std::underlying_type_t<E>>::min)()
? enum_range<E>::min
: (std::numeric_limits<std::underlying_type_t<E>>::min)());
template <typename L, typename R>
constexpr bool mixed_sign_less(L lhs, R rhs) noexcept {
static_assert(std::is_integral_v<L> && std::is_integral_v<R>, "nameof::detail::mixed_sign_less requires integral type.");
if constexpr (std::is_signed_v<L> && std::is_unsigned_v<R>) {
// If 'left' is negative, then result is 'true', otherwise cast & compare.
return lhs < 0 || static_cast<std::make_unsigned_t<L>>(lhs) < rhs;
} else if constexpr (std::is_unsigned_v<L> && std::is_signed_v<R>) {
// If 'right' is negative, then result is 'false', otherwise cast & compare.
return rhs >= 0 && lhs < static_cast<std::make_unsigned_t<R>>(rhs);
} else {
// If same signedness (both signed or both unsigned).
return lhs < rhs;
}
}
template <typename L, typename R>
constexpr int mixed_sign_min_as_int(L lhs, R rhs) noexcept {
static_assert(std::is_integral_v<L> && std::is_integral_v<R>, "nameof::detail::mixed_sign_min_as_int requires integral type.");
return mixed_sign_less(lhs, rhs) ? static_cast<int>(lhs) : static_cast<int>(rhs);
}
template <typename L, typename R>
constexpr int mixed_sign_max_as_int(L lhs, R rhs) noexcept {
static_assert(std::is_integral_v<L> && std::is_integral_v<R>, "nameof::detail::mixed_sign_max_as_int requires integral type.");
return mixed_sign_less(lhs, rhs) ? static_cast<int>(rhs) : static_cast<int>(lhs);
}
template <typename E>
inline constexpr int reflected_max_v = static_cast<int>(enum_range<E>::max < (std::numeric_limits<std::underlying_type_t<E>>::max)()
? enum_range<E>::max
: (std::numeric_limits<std::underlying_type_t<E>>::max)());
inline constexpr int reflected_min_v = mixed_sign_max_as_int(enum_range<E>::min, (std::numeric_limits<std::underlying_type_t<E>>::min)());
template <typename E>
inline constexpr int reflected_max_v = mixed_sign_min_as_int(enum_range<E>::max, (std::numeric_limits<std::underlying_type_t<E>>::max)());
template <typename E>
constexpr std::size_t reflected_size() {
@ -388,28 +414,32 @@ constexpr std::size_t reflected_size() {
}
template <typename E, int... I>
constexpr int range_min(std::integer_sequence<int, I...>) noexcept {
static_assert(is_enum_v<E>, "nameof::detail::range_min requires enum type.");
constexpr auto values(std::integer_sequence<int, I...>) noexcept {
static_assert(is_enum_v<E>, "nameof::detail::values requires enum type.");
constexpr std::array<bool, sizeof...(I)> valid{{(n<E, static_cast<E>(I + reflected_min_v<E>)>().size() != 0)...}};
constexpr std::size_t count = ((valid[I] ? 1 : 0) + ...);
int r = 0;
(void)(((n<E, static_cast<E>(I + reflected_min_v<E>)>().size() != 0) ? (r = I + reflected_min_v<E>, false) : true) && ...);
return r;
}
std::array<E, count> values{};
for (std::size_t i = 0, v = 0; v < count; ++i) {
if (valid[i]) {
values[v++] = static_cast<E>(static_cast<int>(i) + reflected_min_v<E>);
}
}
template <typename E, int... I>
constexpr int range_max(std::integer_sequence<int, I...>) noexcept {
static_assert(is_enum_v<E>, "nameof::detail::range_max requires enum type.");
int r = 0;
(void)(((n<E, static_cast<E>(reflected_max_v<E> - I)>().size() != 0) ? (r = reflected_max_v<E> - I, false) : true) && ...);
return r;
return values;
}
template <typename E>
inline constexpr int min_v = range_min<E>(std::make_integer_sequence<int, reflected_size<E>()>{});
inline constexpr auto values_v = values<E>(std::make_integer_sequence<int, reflected_size<E>()>{});
template <typename E>
inline constexpr int max_v = range_max<E>(std::make_integer_sequence<int, reflected_size<E>()>{});
inline constexpr std::size_t count_v = values_v<E>.size();
template <typename E>
inline constexpr int min_v = values_v<E>.empty() ? 0 : static_cast<int>(values_v<E>.front());
template <typename E>
inline constexpr int max_v = values_v<E>.empty() ? 0 : static_cast<int>(values_v<E>.back());
template <typename E>
constexpr std::size_t range_size() noexcept {
@ -422,41 +452,10 @@ constexpr std::size_t range_size() noexcept {
}
template <typename E>
inline constexpr std::size_t size_v = range_size<E>();
inline constexpr std::size_t range_size_v = range_size<E>();
template <typename E>
inline constexpr auto range_v = std::make_integer_sequence<int, size_v<E>>{};
template <typename E, int... I>
constexpr std::size_t count(std::integer_sequence<int, I...>) noexcept {
static_assert(is_enum_v<E>, "nameof::detail::count requires enum type.");
return (((n<E, static_cast<E>(I + min_v<E>)>().size() != 0) ? 1 : 0) + ...);
}
template <typename E>
inline constexpr std::size_t count_v = count<E>(range_v<E>);
template <typename E>
inline constexpr auto sequence_v = std::make_index_sequence<count_v<E>>{};
template <typename E, int... I>
constexpr auto values(std::integer_sequence<int, I...>) noexcept {
static_assert(is_enum_v<E>, "nameof::detail::values requires enum type.");
constexpr std::array<bool, size_v<E>> valid{{(n<E, static_cast<E>(I + min_v<E>)>().size() != 0)...}};
std::array<E, count_v<E>> values{};
for (std::size_t i = 0, v = 0; v < count_v<E>; ++i) {
if (valid[i]) {
values[v++] = static_cast<E>(static_cast<int>(i) + min_v<E>);
}
}
return values;
}
template <typename E>
using index_t = std::conditional_t<size_v<E> < (std::numeric_limits<std::uint8_t>::max)(), std::uint8_t, std::uint16_t>;
using index_t = std::conditional_t<range_size_v<E> < (std::numeric_limits<std::uint8_t>::max)(), std::uint8_t, std::uint16_t>;
template <typename E>
inline constexpr auto invalid_index_v = (std::numeric_limits<index_t<E>>::max)();
@ -466,25 +465,24 @@ constexpr auto indexes(std::integer_sequence<int, I...>) noexcept {
static_assert(is_enum_v<E>, "nameof::detail::indexes requires enum type.");
index_t<E> i = 0;
return std::array<index_t<E>, size_v<E>>{{((n<E, static_cast<E>(I + min_v<E>)>().size() != 0) ? i++ : invalid_index_v<E>)...}};
return std::array<index_t<E>, sizeof...(I)>{{((n<E, static_cast<E>(I + min_v<E>)>().size() != 0) ? i++ : invalid_index_v<E>)...}};
}
template <typename E>
inline constexpr bool sparsity_v = (sizeof(const char*) * size_v<E>) > (sizeof(index_t<E>) * size_v<E> + sizeof(const char*) * count_v<E>);
inline constexpr bool sparsity_v = (sizeof(const char*) * range_size_v<E>) > (sizeof(index_t<E>) * range_size_v<E> + sizeof(const char*) * count_v<E>);
template <typename E, int... I>
constexpr auto strings(std::integer_sequence<int, I...>) noexcept {
static_assert(is_enum_v<E>, "nameof::detail::strings requires enum type.");
return std::array<const char*, size_v<E>>{{enum_name_v<E, static_cast<E>(I + min_v<E>)>.data()...}};
return std::array<const char*, sizeof...(I)>{{enum_name_v<E, static_cast<E>(I + min_v<E>)>.data()...}};
}
template <typename E, std::size_t... I>
constexpr auto strings(std::index_sequence<I...>) noexcept {
static_assert(is_enum_v<E>, "nameof::detail::strings requires enum type.");
constexpr auto vals = values<E>(range_v<E>);
return std::array<const char*, count_v<E>>{{enum_name_v<E, vals[I]>.data()...}};
return std::array<const char*, sizeof...(I)>{{enum_name_v<E, values_v<E>[I]>.data()...}};
}
template <typename E>
@ -492,9 +490,9 @@ constexpr auto strings() noexcept {
static_assert(is_enum_v<E>, "nameof::detail::strings requires enum type.");
if constexpr (sparsity_v<E>) {
return strings<E>(sequence_v<E>);
return strings<E>(std::make_index_sequence<count_v<E>>{});
} else {
return strings<E>(range_v<E>);
return strings<E>(std::make_integer_sequence<int, range_size_v<E>>{});
}
}
@ -507,7 +505,7 @@ class enum_traits {
static_assert(count_v<E> > 0, "nameof::enum_range requires enum implementation or valid max and min.");
using U = std::underlying_type_t<E>;
inline static constexpr auto strings_ = strings<E>();
inline static constexpr auto indexes_ = indexes<E>(range_v<E>);
inline static constexpr auto indexes_ = indexes<E>(std::make_integer_sequence<int, range_size_v<E>>{});
public:
static constexpr std::string_view name(E value) noexcept {