From 7a9411dde66117e9d6e1019e0dd9209ab18e78ed Mon Sep 17 00:00:00 2001
From: Pavel Labath <pavelo@centrum.sk>
Date: Thu, 19 May 2011 13:25:32 +0200
Subject: c++ lua binding: get rid of deleted functions and rvalue references

---
 src/FbTk/Luamm.cc | 15 ++++++++++----
 src/FbTk/Luamm.hh | 58 ++++++++++++++-----------------------------------------
 2 files changed, 25 insertions(+), 48 deletions(-)

diff --git a/src/FbTk/Luamm.cc b/src/FbTk/Luamm.cc
index 81a8fb3..d17096f 100644
--- a/src/FbTk/Luamm.cc
+++ b/src/FbTk/Luamm.cc
@@ -108,10 +108,6 @@ namespace lua {
         /*
          * This function is called when lua encounters an error outside of any protected
          * environment
-         * Throwing the exception through lua code appears to work, even if it was compiled
-         * without -fexceptions. If it turns out, it fails in some conditions, it could be
-         * replaced with some longjmp() magic. But that shouldn't be necessary, as this function
-         * will not be called under normal conditions (we execute everything in protected mode).
          */
         int panic_throw(lua_State *l)
         {
@@ -191,6 +187,17 @@ namespace lua {
         L->pop(1);
     }
 
+    exception::exception(const exception &other)
+        : std::runtime_error(other), L(other.L)
+    {
+        L->checkstack(2);
+
+        L->rawgetfield(REGISTRYINDEX, lua_exception_namespace);
+        L->rawgeti(-1, other.key);
+        key = L->ref(-2);
+        L->pop(1);
+    }
+
     exception::~exception() throw()
     {
         if(not L)
diff --git a/src/FbTk/Luamm.hh b/src/FbTk/Luamm.hh
index 5c8d382..e173be9 100644
--- a/src/FbTk/Luamm.hh
+++ b/src/FbTk/Luamm.hh
@@ -26,8 +26,9 @@
 #include <memory>
 #include <stdexcept>
 
-#include <lua.h>
 #include <lauxlib.h>
+#include <lua.h>
+#include <lualib.h>
 
 #include "Slot.hh"
 
@@ -81,79 +82,50 @@ namespace lua {
      * pushed into the same state it was generated in.
      */
     class exception: public std::runtime_error {
-        /*
-         * We only allow moving, to avoid complications with multiple references. It shouldn't be
-         * difficult to modify this to work with copying, if that proves unavoidable.
-         */
         state *L;
         int key;
 
         static std::string get_error_msg(state *L);
 
-        exception(const exception &) = delete;
-        const exception& operator=(const exception &) = delete;
-
-        public:
-        exception(exception &&other)
-            : std::runtime_error(std::move(other)), L(other.L), key(other.key)
-        { other.L = NULL; }
+        exception& operator=(const exception &other); // not implemented
 
+    public:
         explicit exception(state *l);
+        exception(const exception &other);
         virtual ~exception() throw();
 
         void push_lua_error(state *l);
     };
 
     class not_string_error: public std::runtime_error {
-        public:
-            not_string_error()
-                : std::runtime_error("Cannot convert value to a string")
-            {}
+    public:
+        not_string_error()
+            : std::runtime_error("Cannot convert value to a string")
+        {}
     };
 
     // the name says it all
     class syntax_error: public lua::exception {
-        syntax_error(const syntax_error &) = delete;
-        const syntax_error& operator=(const syntax_error &) = delete;
-
-        public:
+    public:
         syntax_error(state *L)
             : lua::exception(L)
         {}
-
-        syntax_error(syntax_error &&other)
-            : lua::exception(std::move(other))
-        {}
     };
 
     // loadfile() encountered an error while opening/reading the file
     class file_error: public lua::exception {
-        file_error(const file_error &) = delete;
-        const file_error& operator=(const file_error &) = delete;
-
-        public:
+    public:
         file_error(state *L)
             : lua::exception(L)
         {}
-
-        file_error(file_error &&other)
-            : lua::exception(std::move(other))
-        {}
     };
 
     // double fault, lua encountered an error while running the error handler function
     class errfunc_error: public lua::exception {
-        errfunc_error(const errfunc_error &) = delete;
-        const errfunc_error& operator=(const errfunc_error &) = delete;
-
-        public:
+    public:
         errfunc_error(state *L)
             : lua::exception(L)
         {}
-
-        errfunc_error(errfunc_error &&other)
-            : lua::exception(std::move(other))
-        {}
     };
 
     // a fancy wrapper around lua_State
@@ -313,13 +285,11 @@ namespace lua {
      * since we have exception.what() for that, putting the message on the stack is not
      * necessary.
      */
-    class stack_sentry {
+    class stack_sentry: private FbTk::NotCopyable {
         state *L;
         int n;
 
-        stack_sentry(const stack_sentry &) = delete;
-        const stack_sentry& operator=(const stack_sentry &) = delete;
-        public:
+    public:
         explicit stack_sentry(state &l, int n_ = 0) throw()
             : L(&l), n(l.gettop()+n_)
         { assert(n >= 0); }
-- 
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