Merge pull request FreeCAD#20049 from hyarion/fix/ppa

Refactor static type checks

Author: chennes

src/App/PropertyContainer.h

@@ -319,19 +319,12 @@ private: \
 #define PROPERTY_HEADER_WITH_OVERRIDE(_class_) \
   TYPESYSTEM_HEADER_WITH_OVERRIDE(); \
 public: \
-  static constexpr const char* getClassName() {\
-    /*
-    TODO: When c++20 is available \
-    - Use consteval to ensure the function is evaluated at compile time \
-    - Move bulk of the function to a template `validate<T, _class_, #_class>()` \
-    - Use `starts_with` when checking namespace in path \
-    */ \
-    \
+  static consteval const char* getClassName() {\
     static_assert(sizeof(_class_) > 0, "Class is not complete"); \
     \
     constexpr const char* sClass = #_class_; \
     constexpr std::string_view vClass {sClass}; \
-    static_assert(vClass[0] != '\0', "Class name must not be empty"); \
+    static_assert(!vClass.empty(), "Class name must not be empty"); \
     static_assert(std::is_base_of<App::PropertyContainer, _class_>::value, \
                   "Class must be derived from App::PropertyContainer"); \
     \
@@ -341,22 +334,23 @@ public: \
       constexpr auto pos = vClass.find("::"); \
       static_assert(pos != std::string_view::npos, \
                     "Class name must be fully qualified for document object derived classes"); \
-      static_assert(pos != 0, "Namespace must not be empty"); \
-      \
       constexpr auto vNamespace = vClass.substr(0, pos); \
+      static_assert(!vNamespace.empty(), "Namespace must not be empty"); \
+      \
       constexpr std::string_view filePath = __FILE__; \
-      constexpr auto posAfterSrcMod =  filePath.find("/src/Mod/"); \
-      if constexpr (constexpr bool hasSrcModInPath = posAfterSrcMod != std::string_view::npos) { \
-        constexpr auto pathAfterSrcMod = filePath.substr(posAfterSrcMod + 9); \
-        /* some workarounds are needed, if CI is ok in the future, remove these: \
-          - isSubClassOfDocObj shouldn't be needed, but it is for some compilers \
-          - allowing `Path` until it's been properly renamed */ \
-        constexpr bool workarounds = !isSubClassOfDocObj || vNamespace == "Path"; \
-        /* TODO: use `starts_with` instead of `find` when c++20 is available */ \
-        constexpr bool isPathOk = pathAfterSrcMod.find(vNamespace) != std::string_view::npos; \
-        static_assert(workarounds || isPathOk, \
-                      "Classes in `src/Mod` needs to be in a directory with the same name as" \
-                      " the namespace in order to load correctly"); \
+      constexpr std::string_view modPath = "/src/Mod/"; \
+      constexpr auto posAfterSrcMod = filePath.find(modPath); \
+      constexpr bool hasSrcModInPath = posAfterSrcMod != std::string_view::npos; \
+      if constexpr (hasSrcModInPath) { \
+        constexpr auto pathAfterSrcMod = filePath.substr(posAfterSrcMod + modPath.size()); \
+        constexpr bool isPathOk = pathAfterSrcMod.starts_with(vNamespace); \
+        static_assert( \
+          /* some compilers evaluate static_asserts inside ifs before checking it's a valid codepath */ \
+          !isSubClassOfDocObj || !hasSrcModInPath || \
+          /* allow `Path` until it's been properly renamed to CAM */ \
+          vNamespace == "Path" || isPathOk, \
+          "Classes in `src/Mod` needs to be in a directory with the same name as" \
+          " the namespace in order to load correctly"); \
       } \
     } \
     return sClass; \