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more c++17, more refactoring

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This commit is contained in:
neargye 2019-03-22 13:56:01 +05:00
parent 6d70993bee
commit 16f010ef08
1 changed files with 38 additions and 38 deletions
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74
include/nameof.hpp
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@ -48,17 +48,17 @@ struct identity {
using type = T;
};
constexpr bool is_lexeme(char s) noexcept {
return !((s >= '0' && s <= '9') || (s >= 'a' && s <= 'z') || (s >= 'A' && s <= 'Z') || s == '_');
constexpr bool is_name_char(char s) noexcept {
return (s >= '0' && s <= '9') || (s >= 'a' && s <= 'z') || (s >= 'A' && s <= 'Z') || s == '_';
}
constexpr bool is_bracket(char s) noexcept {
constexpr bool is_bracket_char(char s) noexcept {
return s == ')' || s == '}' || s == '>' || s == '(' || s == '{' || s == '<';
}
constexpr std::string_view pretty_name(std::string_view name, bool with_suffix) noexcept {
for (std::size_t i = name.size(), h = 0, s = 0; i > 0; --i) {
if (h == 0 && is_lexeme(name[i - 1]) && !is_bracket(name[i - 1])) {
if (h == 0 && !is_name_char(name[i - 1]) && !is_bracket_char(name[i - 1])) {
++s;
continue;
}
@ -103,7 +103,7 @@ constexpr std::string_view pretty_name(std::string_view name, bool with_suffix)
}
for (std::size_t i = name.size() - s; i > 0; --i) {
if (is_lexeme(name[i - 1])) {
if (!is_name_char(name[i - 1])) {
name.remove_prefix(i);
break;
}
@ -113,12 +113,12 @@ constexpr std::string_view pretty_name(std::string_view name, bool with_suffix)
return name;
}
template <typename T>
template <typename E>
constexpr int nameof_enum_impl_() noexcept {
#if defined(__clang__)
return sizeof(__PRETTY_FUNCTION__) - sizeof("int nameof::detail::nameof_enum_impl_() [T = ") - sizeof("]") + 1;
return sizeof(__PRETTY_FUNCTION__) - sizeof("int nameof::detail::nameof_enum_impl_() [E = ") - sizeof("]") + 1;
#elif defined(__GNUC__)
return sizeof(__PRETTY_FUNCTION__) - sizeof("constexpr int nameof::detail::nameof_enum_impl_() [with T = ") - sizeof("]") + 1;
return sizeof(__PRETTY_FUNCTION__) - sizeof("constexpr int nameof::detail::nameof_enum_impl_() [with E = ") - sizeof("]") + 1;
#elif defined(_MSC_VER)
return sizeof(__FUNCSIG__) - sizeof("int __cdecl nameof::detail::nameof_enum_impl_<") - sizeof(">(void) noexcept") + 1;
#else
@ -126,24 +126,24 @@ constexpr int nameof_enum_impl_() noexcept {
#endif
}
template <typename T, T V>
template <typename E, E V>
constexpr std::string_view nameof_enum_impl() noexcept {
#if defined(__clang__)
const auto str = __PRETTY_FUNCTION__;
const auto size = sizeof(__PRETTY_FUNCTION__) - 1;
const auto prefix = sizeof("std::string_view nameof::detail::nameof_enum_impl() [T = ") + nameof_enum_impl_<T>() + sizeof("; V = ") - 2;
const auto prefix = sizeof("std::string_view nameof::detail::nameof_enum_impl() [E = ") + nameof_enum_impl_<E>() + sizeof("; V = ") - 2;
const auto suffix = sizeof("]") - 1;
return detail::pretty_name({str + prefix, size - prefix - suffix}, false);
#elif defined(__GNUC__)
const auto str = __PRETTY_FUNCTION__;
const auto size = sizeof(__PRETTY_FUNCTION__) - 1;
const auto prefix = sizeof("constexpr std::string_view nameof::detail::nameof_enum_impl() [with T = ") + nameof_enum_impl_<T>() + sizeof("; V = ");
const auto prefix = sizeof("constexpr std::string_view nameof::detail::nameof_enum_impl() [with E = ") + nameof_enum_impl_<E>() + sizeof("; V = ");
const auto suffix = sizeof("; std::string_view = std::basic_string_view<char>]") - 1;
return {str + prefix, size - prefix - suffix};
#elif defined(_MSC_VER)
const auto str = __FUNCSIG__;
const auto size = sizeof(__FUNCSIG__) - 1;
const auto prefix = sizeof("class std::basic_string_view<char,struct std::char_traits<char> > __cdecl nameof::detail::nameof_enum_impl<") + nameof_enum_impl_<T>();
const auto prefix = sizeof("class std::basic_string_view<char,struct std::char_traits<char> > __cdecl nameof::detail::nameof_enum_impl<") + nameof_enum_impl_<E>();
const auto suffix = sizeof(">(void) noexcept") - 1;
return detail::pretty_name({str + prefix, size - prefix - suffix}, false);
#else
@ -151,34 +151,34 @@ constexpr std::string_view nameof_enum_impl() noexcept {
#endif
}
template <typename T, int I>
template <typename E, int V>
struct nameof_enum_t {
constexpr std::string_view operator()(int value) const noexcept {
switch (value - I) {
switch (value - V) {
case 0:
return nameof_enum_impl<T, T{I}>();
return nameof_enum_impl<E, E{V}>();
case 1:
return nameof_enum_impl<T, T{I + 1}>();
return nameof_enum_impl<E, E{V + 1}>();
case 2:
return nameof_enum_impl<T, T{I + 2}>();
return nameof_enum_impl<E, E{V + 2}>();
case 3:
return nameof_enum_impl<T, T{I + 3}>();
return nameof_enum_impl<E, E{V + 3}>();
case 4:
return nameof_enum_impl<T, T{I + 4}>();
return nameof_enum_impl<E, E{V + 4}>();
case 5:
return nameof_enum_impl<T, T{I + 5}>();
return nameof_enum_impl<E, E{V + 5}>();
case 6:
return nameof_enum_impl<T, T{I + 6}>();
return nameof_enum_impl<E, E{V + 6}>();
case 7:
return nameof_enum_impl<T, T{I + 7}>();
return nameof_enum_impl<E, E{V + 7}>();
default:
return nameof_enum_t<T, I + 8>{}(value);
return nameof_enum_t<E, V + 8>{}(value);
}
}
};
template <typename T>
struct nameof_enum_t<T, NAMEOF_ENUM_MAX_SEARCH_DEPTH> {
template <typename E>
struct nameof_enum_t<E, NAMEOF_ENUM_MAX_SEARCH_DEPTH> {
constexpr std::string_view operator()(int) const noexcept {
return {"nameof_enum::out_of_range"};
}
@ -228,9 +228,8 @@ constexpr std::string_view nameof_type_impl() noexcept {
#endif
}
template <typename T,
typename = typename std::enable_if<!std::is_reference<T>::value>::type>
constexpr std::string_view nameof_impl(std::string_view name, bool with_suffix = false) noexcept {
template <typename T, typename = std::enable_if_t<!std::is_reference_v<T>>>
constexpr std::string_view nameof_impl(std::string_view name, bool with_suffix) noexcept {
return detail::pretty_name(name, with_suffix);
}
@ -241,11 +240,10 @@ constexpr std::string_view nameof_raw_impl(std::string_view name) noexcept {
} // namespace detail
template <typename T,
typename = typename std::enable_if<std::is_enum<typename std::decay<T>::type>::value>::type>
template <typename T, typename = std::enable_if_t<std::is_enum_v<std::decay_t<T>>>>
constexpr std::string_view nameof_enum(T value) noexcept {
constexpr auto s = std::is_signed<typename std::underlying_type<typename std::decay<T>::type>::type>::value;
return detail::nameof_enum_t<typename std::decay<T>::type, s ? -NAMEOF_ENUM_MAX_SEARCH_DEPTH : 0>{}(static_cast<int>(value));
constexpr auto s = std::is_signed_v<std::underlying_type_t<std::decay_t<T>>>;
return detail::nameof_enum_t<std::decay_t<T>, s ? -NAMEOF_ENUM_MAX_SEARCH_DEPTH : 0>{}(static_cast<int>(value));
}
template <typename T>
@ -260,18 +258,20 @@ constexpr std::string_view nameof_type(T) noexcept {
} // namespace nameof
// Used to obtain the simple (unqualified) string name of a variable, member, function, enum, macro.
// Used to obtain the simple (unqualified) string name of variable, function, enum, macro.
#define NAMEOF(...) ::nameof::detail::nameof_impl<decltype(__VA_ARGS__)>(#__VA_ARGS__, false)
// Used to obtain the full string name of a variable, member, function, enum, macro.
// Used to obtain the full string name of variable, function, enum, macro.
#define NAMEOF_FULL(...) ::nameof::detail::nameof_impl<decltype(__VA_ARGS__)>(#__VA_ARGS__, true)
// Used to obtain the raw string name of a variable, member, function, enum, macro.
// Used to obtain the raw string name of variable, function, enum, macro.
#define NAMEOF_RAW(...) ::nameof::detail::nameof_raw_impl<decltype(__VA_ARGS__)>(#__VA_ARGS__)
// Used to obtain the simple (unqualified) string name of a enum variable.
// Used to obtain the simple (unqualified) string name of enum variable.
#define NAMEOF_ENUM(...) ::nameof::nameof_enum<decltype(__VA_ARGS__)>(__VA_ARGS__)
// Used to obtain the string name of a type.
// Used to obtain the string name of variable type.
#define NAMEOF_TYPE(...) ::nameof::nameof_type<decltype(__VA_ARGS__)>()
// Used to obtain the string name of type.
#define NAMEOF_TYPE_T(...) ::nameof::nameof_type<__VA_ARGS__>()