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simplify pretty_name to speed up constexpr evaluation (#227)

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Anton Shalgachev 2022-12-20 10:24:01 +01:00 • committed by GitHub
parent e1a68e9dd3
commit d5e8530191
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1 changed files with 17 additions and 10 deletions
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27
include/magic_enum.hpp
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@ -251,27 +251,34 @@ class static_string<0> {
}; };
constexpr string_view pretty_name(string_view name) noexcept { constexpr string_view pretty_name(string_view name) noexcept {
char const* str = name.data();
for (std::size_t i = name.size(); i > 0; --i) { for (std::size_t i = name.size(); i > 0; --i) {
if (!((name[i - 1] >= '0' && name[i - 1] <= '9') || char c = str[i - 1];
(name[i - 1] >= 'a' && name[i - 1] <= 'z') || if (!((c >= '0' && c <= '9') ||
(name[i - 1] >= 'A' && name[i - 1] <= 'Z') || (c >= 'a' && c <= 'z') ||
(c >= 'A' && c <= 'Z') ||
#if defined(MAGIC_ENUM_ENABLE_NONASCII) #if defined(MAGIC_ENUM_ENABLE_NONASCII)
(name[i - 1] & 0x80) || (c & 0x80) ||
#endif #endif
(name[i - 1] == '_'))) { (c == '_'))) {
name.remove_prefix(i); name.remove_prefix(i);
break; break;
} }
} }
if (name.size() > 0 && ((name[0] >= 'a' && name[0] <= 'z') || if (name.size() > 0)
(name[0] >= 'A' && name[0] <= 'Z') || {
char c = name[0];
if ((c >= 'a' && c <= 'z') ||
(c >= 'A' && c <= 'Z') ||
#if defined(MAGIC_ENUM_ENABLE_NONASCII) #if defined(MAGIC_ENUM_ENABLE_NONASCII)
(name[0]) & 0x80) || (c) & 0x80) ||
#endif #endif
(name[0] == '_'))) { (c == '_')) {
return name; return name;
}
} }
return {}; // Invalid name. return {}; // Invalid name.
} }