fgerlits commented on code in PR #1589:
URL: https://github.com/apache/nifi-minifi-cpp/pull/1589#discussion_r1259952982
##########
libminifi/include/core/Core.h:
##########
@@ -95,6 +98,62 @@ static inline std::string getClassName() {
#endif
}
+constexpr std::string_view removeStructOrClassPrefix(std::string_view input) {
+ constexpr std::string_view STRUCT = "struct "; // should be static
constexpr, but that is only allowed inside a constexpr function with std >=
c++23
+ constexpr std::string_view CLASS = "class ";
+
+ for (auto prefix : { STRUCT, CLASS }) {
+ if (input.find(prefix) == 0) {
+ return input.substr(prefix.size());
+ }
+ }
+ return input;
+}
+
+// based on
https://bitwizeshift.github.io/posts/2021/03/09/getting-an-unmangled-type-name-at-compile-time/
+template<typename T>
+constexpr auto typeNameArray() {
+#if defined(__clang__)
+ constexpr auto prefix = std::string_view{"[T = "};
+ constexpr auto suffix = std::string_view{"]"};
+ constexpr auto function = std::string_view{__PRETTY_FUNCTION__};
+#elif defined(__GNUC__)
+ constexpr auto prefix = std::string_view{"with T = "};
+ constexpr auto suffix = std::string_view{"]"};
+ constexpr auto function = std::string_view{__PRETTY_FUNCTION__};
+#elif defined(_MSC_VER)
+ constexpr auto prefix = std::string_view{"typeNameArray<"};
+ constexpr auto suffix = std::string_view{">(void)"};
+ constexpr auto function = std::string_view{__FUNCSIG__};
+#else
+# error Unsupported compiler
+#endif
+
+ static_assert(function.find(prefix) != std::string_view::npos &&
function.rfind(suffix) != std::string_view::npos);
+
+ constexpr auto start = function.find(prefix) + prefix.size();
+ constexpr auto end = function.rfind(suffix);
+ static_assert(start < end);
+
+#if defined(_MSC_VER)
+ constexpr auto name = removeStructOrClassPrefix(function.substr(start, end -
start));
+#else
+ constexpr auto name = function.substr(start, end - start);
+#endif
+
+ return utils::string_view_to_array<name.length()>(name);
+}
+
+template<typename T>
+struct TypeNameHolder {
+ static constexpr auto value = typeNameArray<T>();
+};
+
+template<typename T>
+constexpr std::string_view className() {
+ return utils::array_to_string_view(TypeNameHolder<T>::value);
+}
Review Comment:
added to the LICENSE and NOTICE files in
f93be28fc17ccafdf82f857fd6e2087453fbb3d4
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