Better demangling

Userdata pushed before the usertype is pushed will not latch onto the new metatable if its added
Updated tests

sol/demangle.hpp

@@ -33,28 +33,23 @@
 
 namespace sol {
 namespace detail {
-#ifndef SOL_NO_RTTI
 #ifdef _MSC_VER
+#ifndef SOL_NO_RTTI
 inline std::string get_type_name(const std::type_info& id) {
-    return id.name();
-}
-
-#elif defined(__GNUC__) || defined(__clang__)
-inline std::string get_type_name(const std::type_info& id) {
-    int status;
-    char* unmangled = abi::__cxa_demangle(id.name(), 0, 0, &status);
-    std::string realname = unmangled;
-    std::free(unmangled);
+    std::string realname = id.name();
+    const static std::array<std::string, 2> removals = { { "struct ", "class " } };
+    for (std::size_t r = 0; r < removals.size(); ++r) {
+	    auto found = realname.find(removals[r]);
+	    while (found != std::string::npos) {
+		    realname.erase(found, removals[r].size());
+		    found = realname.find(removals[r]);
+	    }
+    }
     return realname;
 }
-
-#else
-#error Compiler not supported for demangling
-#endif // compilers
-#else
-#ifdef _MSC_VER
+#endif // No RTII
 template <typename T>
-inline std::string get_type_name() {
+inline std::string ctti_get_type_name() {
     std::string name = __FUNCSIG__;
     std::size_t start = name.find("get_type_name");
     if (start == std::string::npos)
@@ -75,10 +70,18 @@ inline std::string get_type_name() {
     while (name.size() > 0 && std::isblank(name.back())) name.erase(--name.end(), name.end());
     return name;
 }
-
 #elif defined(__GNUC__)
+#ifndef SOL_NO_RTTI
+inline std::string get_type_name(const std::type_info& id) {
+    int status;
+    char* unmangled = abi::__cxa_demangle(id.name(), 0, 0, &status);
+    std::string realname = unmangled;
+    std::free(unmangled);
+    return realname;
+}
+#endif // No RTII
 template <typename T>
-inline std::string get_type_name() {
+inline std::string ctti_get_type_name() {
     std::string name = __PRETTY_FUNCTION__;
     std::size_t start = name.find_first_of('=');
     std::size_t end = name.find_last_of(';');
@@ -92,8 +95,17 @@ inline std::string get_type_name() {
     return name;
 }
 #elif defined(__clang__)
+#ifndef SOL_NO_RTTI
+inline std::string get_type_name(const std::type_info& id) {
+    int status;
+    char* unmangled = abi::__cxa_demangle(id.name(), 0, 0, &status);
+    std::string realname = unmangled;
+    std::free(unmangled);
+    return realname;
+}
+#endif // No RTII
 template <typename T>
-inline std::string get_type_name() {
+inline std::string ctti_get_type_name() {
     std::string name = __PRETTY_FUNCTION__;
     std::size_t start = name.find_last_of('[');
     start = name.find_first_of('=', start);
@@ -107,36 +119,28 @@ inline std::string get_type_name() {
     name = name.substr(start, end - start);
     return name;
 }
+
 #else
 #error Compiler not supported for demangling
 #endif // compilers
-#endif // No Runtime Type information
 
 template <typename T>
 inline std::string demangle_once() {
 #ifndef SOL_NO_RTTI
     std::string realname = get_type_name(typeid(T));
 #else
-    std::string realname = get_type_name<T>();
+    std::string realname = ctti_get_type_name<T>();
 #endif // No Runtime Type Information
-    const static std::array<std::string, 2> removals = {{ "struct ", "class " }};
-    const static std::array<std::string, 2> replacements = {{ "::", "_" }};
-    for(std::size_t r = 0; r < removals.size(); ++r) {
-        auto found = realname.find(removals[r]);
-        while(found != std::string::npos) {
-            realname.erase(found, removals[r].size());
-            found = realname.find(removals[r]);
-       }
-    }
+    return realname;
+}
 
-    for(std::size_t r = 0; r < replacements.size(); r+=2) {
-        auto found = realname.find(replacements[r]);
-        while(found != std::string::npos) {
-            realname.replace(found, replacements[r].size(), replacements[r + 1]);
-            found = realname.find(replacements[r], found);
+template <typename T>
+inline std::string short_demangle_once() {
+    std::string realname = ctti_get_type_name<T>();
+    std::size_t idx = realname.find_last_of(":`'\"{}[]|-)(*^&!@#$%`~", std::string::npos, 23);
+    if (idx != std::string::npos) {
+        realname.erase(0, realname.length() < idx ? realname.length() : idx + 1);
     }
-    }
-
     return realname;
 }
 
@@ -145,6 +149,12 @@ inline std::string demangle() {
     static const std::string d = demangle_once<T>();
     return d;
 }
+
+template <typename T>
+inline std::string short_demangle() {
+	static const std::string d = short_demangle_once<T>();
+	return d;
+}
 } // detail
 } // sol
 

sol/stack_check.hpp

@@ -235,6 +235,20 @@ struct checker<T*, type::userdata, C> {
     }
 };
 
+template <typename C>
+struct checker<userdata_value, type::userdata, C> {
+    template <typename Handler>
+    static bool check(lua_State* L, int index, Handler&& handler) {
+        type t = type_of(L, index);
+        bool success = t == type::userdata || t == type::lightuserdata;
+        if (!success) {
+            // expected type, actual type
+            handler(L, index, type::lightuserdata, t);
+        }
+        return success;
+    }
+};
+
 template <typename T, typename C>
 struct checker<T, type::userdata, C> {
     template <typename U, typename Handler>

sol/stack_push.hpp

@@ -44,7 +44,7 @@ struct pusher {
         referencereference = allocationtarget;
         std::allocator<T> alloc{};
         alloc.construct(allocationtarget, std::forward<Args>(args)...);
-        luaL_getmetatable(L, &usertype_traits<T>::metatable[0]);
+        luaL_newmetatable(L, &usertype_traits<T>::metatable[0]);
         lua_setmetatable(L, -2);
         return 1;
     }

sol/usertype.hpp

@@ -449,6 +449,7 @@ private:
     template<typename... Args>
     usertype(usertype_detail::verified_tag, Args&&... args) : indexfunc(nullptr), newindexfunc(nullptr), constructfunc(nullptr), 
     destructfunc(nullptr), functiongcfunc(nullptr), needsindexfunction(false), baseclasscheck(nullptr), baseclasscast(nullptr) {
+        static_assert((sizeof...(Args) % 2) == 0, "incorrect pairing of arguments to usertype creation: maybe forgotten comma somewhere");
         functionnames.reserve(sizeof...(args)+3);
         functiontable.reserve(sizeof...(args)+3);
         metafunctiontable.reserve(sizeof...(args)+3);

sol/usertype_traits.hpp

@@ -29,13 +29,17 @@ namespace sol {
 template<typename T>
 struct usertype_traits {
     static const std::string name;
+    static const std::string qualified_name;
     static const std::string metatable;
     static const std::string variable_metatable;
     static const std::string gc_table;
 };
 
 template<typename T>
-const std::string usertype_traits<T>::name = detail::demangle<T>();
+const std::string usertype_traits<T>::name = detail::short_demangle<T>();
+
+template<typename T>
+const std::string usertype_traits<T>::qualified_name = detail::demangle<T>();
 
 template<typename T>
 const std::string usertype_traits<T>::metatable = std::string("sol.").append(detail::demangle<T>());

tests.cpp

@@ -408,13 +408,13 @@ TEST_CASE("usertype/usertype-constructors", "Show that we can create classes fro
     lua.set_usertype(lc);
 
     lua.script(
-        "a = crapola_fuser.new(2)\n"
+        "a = fuser.new(2)\n"
         "u = a:add(1)\n"
         "v = a:add2(1)\n"
-        "b = crapola_fuser:new()\n"
+        "b = fuser:new()\n"
         "w = b:add(1)\n"
         "x = b:add2(1)\n"
-        "c = crapola_fuser.new(2, 3)\n"
+        "c = fuser.new(2, 3)\n"
         "y = c:add(1)\n"
         "z = c:add2(1)\n");
     sol::object a = lua.get<sol::object>("a");
@@ -615,6 +615,21 @@ TEST_CASE("usertype/member-variables", "allow table-like accessors to behave as
                "local x = v.x\n"
                "assert(x == 3)\n"
                ));
+
+    struct breaks {
+        sol::function f;
+    };
+    
+    lua.open_libraries(sol::lib::base);
+    lua.set("b", breaks());
+    lua.new_usertype<breaks>("breaks",
+        "f", &breaks::f
+    );
+
+    breaks& b = lua["b"];
+    REQUIRE_NOTHROW(lua.script("b.f = function () print('BARK!') end"));
+    REQUIRE_NOTHROW(lua.script("b.f()"));
+    REQUIRE_NOTHROW(b.f());    
 }
 
 TEST_CASE("usertype/nonmember-functions", "let users set non-member functions that take unqualified T as first parameter to usertype") {