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-rw-r--r--lib/enumDetails.hpp133
-rw-r--r--lib/stream_support.hpp11
2 files changed, 144 insertions, 0 deletions
diff --git a/lib/enumDetails.hpp b/lib/enumDetails.hpp
new file mode 100644
index 0000000..ace6252
--- /dev/null
+++ b/lib/enumDetails.hpp
@@ -0,0 +1,133 @@
+#pragma once
+
+#include <algorithm>
+#include <array>
+#include <limits>
+#include <optional>
+#include <string_view>
+
+/// EnumTypeDetails
+// Extracts the fully qualified name of the enumeration
+template<typename E> struct EnumTypeDetails {
+#ifndef ENUM_PROBE
+protected:
+#endif
+ constexpr static std::string_view SEARCH_TYPE {"E = "};
+ constexpr static auto
+ typeraw()
+ {
+ return std::string_view {__PRETTY_FUNCTION__};
+ };
+ constexpr static auto typeNameStart {typeraw().find(SEARCH_TYPE) + SEARCH_TYPE.length()};
+ constexpr static auto typeNameEnd {typeraw().find_first_of("];", typeNameStart)};
+ constexpr static auto typeNameLen {typeNameEnd - typeNameStart};
+ constexpr static auto typeNameArr {[]() {
+ std::array<char, typeNameLen> out;
+ typeraw().copy(out.begin(), typeNameEnd - typeNameStart, typeNameStart);
+ return out;
+ }()};
+
+public:
+ constexpr static std::string_view typeName {typeNameArr.data(), typeNameArr.size()};
+};
+
+/// EnumValueDetails
+// Extracts the value name and constructs string_views of the parts
+template<auto value> struct EnumValueDetails : public EnumTypeDetails<decltype(value)> {
+#ifndef ENUM_PROBE
+private:
+#endif
+ using T = EnumTypeDetails<decltype(value)>;
+ constexpr static auto
+ raw()
+ {
+ return std::string_view {__PRETTY_FUNCTION__};
+ };
+ constexpr static auto nameStart {raw().find_last_of(": ") + 1};
+ constexpr static auto nameEnd {raw().find_first_of("];", nameStart)};
+ constexpr static auto nameLen {nameEnd - nameStart};
+ constexpr static auto nameArr {[]() {
+ std::array<char, nameLen> out;
+ raw().copy(out.begin(), nameLen, nameStart);
+ return out;
+ }()};
+
+public:
+ constexpr static std::string_view valueName {nameArr.data(), nameArr.size()};
+ constexpr static auto valid {valueName.back() < '0' || valueName.back() > '9'};
+ constexpr static auto raw_value {value};
+};
+
+template<typename E> struct EnumValueCollection {
+ using Vs = std::make_integer_sequence<int, 256>;
+};
+
+template<typename E> struct EnumDetails {
+public:
+ using EVC = EnumValueCollection<E>;
+
+#ifndef ENUM_PROBE
+private:
+#endif
+ template<auto... n>
+ constexpr static auto
+ get_valids(std::integer_sequence<int, n...>)
+ {
+ return std::array {EnumValueDetails<static_cast<E>(n)>::valid...};
+ }
+ template<auto... n>
+ constexpr static auto
+ get_values(std::integer_sequence<int, n...>)
+ {
+ return std::array {EnumValueDetails<static_cast<E>(n)>::raw_value...};
+ }
+ template<auto... n>
+ constexpr static auto
+ get_valueNames(std::integer_sequence<int, n...>)
+ {
+ return std::array {EnumValueDetails<values[n]>::valueName...};
+ }
+
+ constexpr static auto valid_flags {get_valids(typename EVC::Vs {})};
+ constexpr static auto valid_count {std::count_if(valid_flags.begin(), valid_flags.end(), std::identity {})};
+
+public:
+ constexpr static auto values {[]() {
+ constexpr auto values {get_values(typename EVC::Vs {})};
+ static_assert(std::is_sorted(values.begin(), values.end()), "Candidate values must be sorted");
+ std::array<E, valid_count> out;
+ auto write = out.begin();
+ for (auto v = values.begin(); const bool & valid : valid_flags) {
+ if (valid) {
+ *write++ = static_cast<E>(*v);
+ }
+ ++v;
+ }
+ return out;
+ }()};
+ constexpr static auto names {get_valueNames(std::make_integer_sequence<int, valid_count> {})};
+
+ constexpr static bool
+ is_valid(E value) noexcept
+ {
+ return std::binary_search(values.begin(), values.end(), value);
+ }
+
+ constexpr static std::optional<E>
+ parse(std::string_view name) noexcept
+ {
+ if (const auto itr = std::find(names.begin(), names.end(), name); itr != names.end()) {
+ return values[std::distance(names.begin(), itr)];
+ }
+ return std::nullopt;
+ }
+
+ constexpr static std::optional<std::string_view>
+ to_string(E value) noexcept
+ {
+ if (const auto itr = std::find(values.begin(), values.end(), value); itr != values.end()) {
+ return names[std::distance(values.begin(), itr)];
+ }
+ return std::nullopt;
+ }
+};
diff --git a/lib/stream_support.hpp b/lib/stream_support.hpp
index 5238234..2ab2f9d 100644
--- a/lib/stream_support.hpp
+++ b/lib/stream_support.hpp
@@ -1,5 +1,6 @@
#pragma once
+#include "enumDetails.hpp"
#include <glm/glm.hpp>
#include <iostream>
#include <maths.h>
@@ -51,6 +52,16 @@ namespace std {
{
return s << arc.first << " ↺ " << arc.second;
}
+
+ template<typename E>
+ concept IsEnum = std::is_enum_v<E>;
+
+ template<IsEnum E>
+ inline std::ostream &
+ operator<<(std::ostream & s, const E & e)
+ {
+ return s << EnumTypeDetails<E>::typeName << "::" << EnumDetails<E>::to_string(e).value();
+ }
}
template<typename T>