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improve constexpr

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terik23 2019-04-11 23:16:36 +05:00
parent 8585365ef7
commit 592b283a32
1 changed files with 10 additions and 16 deletions
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26
include/nameof.hpp
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@ -71,29 +71,23 @@ struct identity final {
template <typename... T> template <typename... T>
[[nodiscard]] constexpr std::string_view nameof_type_impl() noexcept { [[nodiscard]] constexpr std::string_view nameof_type_impl() noexcept {
#if defined(__clang__) #if defined(__clang__)
std::string_view name{__PRETTY_FUNCTION__};
constexpr auto prefix = sizeof("std::string_view nameof::detail::nameof_type_impl() [T = <nameof::detail::identity<") - 1; constexpr auto prefix = sizeof("std::string_view nameof::detail::nameof_type_impl() [T = <nameof::detail::identity<") - 1;
constexpr auto suffix = sizeof(">>]") - 1; constexpr auto suffix = sizeof(">>]") - 1;
constexpr std::string_view name{__PRETTY_FUNCTION__ + prefix, sizeof(__PRETTY_FUNCTION__) - prefix - suffix - 1};
#elif defined(__GNUC__) #elif defined(__GNUC__)
std::string_view name{__PRETTY_FUNCTION__};
constexpr auto prefix = sizeof("constexpr std::string_view nameof::detail::nameof_type_impl() [with T = {nameof::detail::identity<") - 1; constexpr auto prefix = sizeof("constexpr std::string_view nameof::detail::nameof_type_impl() [with T = {nameof::detail::identity<") - 1;
constexpr auto suffix = sizeof(">}; std::string_view = std::basic_string_view<char>]") - 1; constexpr auto suffix = sizeof(">}; std::string_view = std::basic_string_view<char>]") - 1;
constexpr std::string_view name{__PRETTY_FUNCTION__ + prefix, sizeof(__PRETTY_FUNCTION__) - prefix - suffix - 1};
#elif defined(_MSC_VER) #elif defined(_MSC_VER)
std::string_view name{__FUNCSIG__};
constexpr auto prefix = sizeof("class std::basic_string_view<char,struct std::char_traits<char> > __cdecl nameof::detail::nameof_type_impl<struct nameof::detail::identity<") - 1; constexpr auto prefix = sizeof("class std::basic_string_view<char,struct std::char_traits<char> > __cdecl nameof::detail::nameof_type_impl<struct nameof::detail::identity<") - 1;
constexpr auto suffix = sizeof(">>(void) noexcept") - 1; constexpr auto suffix = sizeof(">>(void) noexcept") - 1;
constexpr std::string_view name{__FUNCSIG__ + prefix, sizeof(__FUNCSIG__) - prefix - suffix - 1};
#else #else
return {}; // Unsupported compiler. return {}; // Unsupported compiler.
#endif #endif
#if defined(__clang__) || defined(__GNUC__) || defined(_MSC_VER) #if defined(__clang__) || defined(__GNUC__) || defined(_MSC_VER)
name.remove_prefix(prefix); return name.substr(0, name.length() - (name.back() == ' ' ? 1 : 0));
name.remove_suffix(suffix);
while (name.back() == ' ') {
name.remove_suffix(1);
}
return name;
#endif #endif
} }
@ -116,10 +110,10 @@ template <typename E, E V>
#if defined(__clang__) || (defined(__GNUC__) && __GNUC__ >= 9) || defined(_MSC_VER) #if defined(__clang__) || (defined(__GNUC__) && __GNUC__ >= 9) || defined(_MSC_VER)
constexpr auto prefix = name.find_last_of(" :,-)", name.length() - suffix) + 1; constexpr auto prefix = name.find_last_of(" :,-)", name.length() - suffix) + 1;
if ((name[prefix] >= 'a' && name[prefix] <= 'z') || (name[prefix] >= 'A' && name[prefix] <= 'Z')) { if constexpr (name[prefix] >= '0' && name[prefix] <= '9') {
return name.substr(prefix, name.size() - prefix - suffix);
} else {
return {}; // Value does not have name. return {}; // Value does not have name.
} else {
return name.substr(prefix, name.length() - prefix - suffix);
} }
#endif #endif
} }
@ -167,7 +161,7 @@ template <typename T>
return {}; // Invalid name. return {}; // Invalid name.
} }
for (std::size_t i = name.size(), h = 0, s = 0; i > 0; --i) { for (std::size_t i = name.length(), h = 0, s = 0; i > 0; --i) {
if (name[i - 1] == ')') { if (name[i - 1] == ')') {
++h; ++h;
++s; ++s;
@ -188,7 +182,7 @@ template <typename T>
} }
std::size_t s = 0; std::size_t s = 0;
for (std::size_t i = name.size(), h = 0; i > 0; --i) { for (std::size_t i = name.length(), h = 0; i > 0; --i) {
if (name[i - 1] == '>') { if (name[i - 1] == '>') {
++h; ++h;
++s; ++s;
@ -207,7 +201,7 @@ template <typename T>
} }
} }
for (std::size_t i = name.size() - s; i > 0; --i) { for (std::size_t i = name.length() - s; i > 0; --i) {
if (!((name[i - 1] >= '0' && name[i - 1] <= '9') || if (!((name[i - 1] >= '0' && name[i - 1] <= '9') ||
(name[i - 1] >= 'a' && name[i - 1] <= 'z') || (name[i - 1] >= 'a' && name[i - 1] <= 'z') ||
(name[i - 1] >= 'A' && name[i - 1] <= 'Z') || (name[i - 1] >= 'A' && name[i - 1] <= 'Z') ||