Heavily improved benchmark and first set of optimizations to sol/table.hpp, providing much lower access times for calling a function.

bench.cpp

@@ -1,6 +1,60 @@
 #define NONIUS_RUNNER
 #include "nonius/nonius.h++"
+#include "sol.hpp"
 
-NONIUS_BENCHMARK( "Function Calls", []() {
+struct sol_function_result_bench {
+	void operator () ( nonius::chronometer meter ) const {
+		sol::state lua;
+		lua.script( R"(
+function r ()
+	return 1 + 1		
+end
+)" );
+		sol::function r = lua[ "r" ];
+		meter.measure( [ & ] ( int run_index ) {
+			// Measure cost of lua calling and returning a function
+			return r( );
+		} );
+	}
+};
 
-} );
+struct sol_direct_bench {
+	void operator () ( nonius::chronometer meter ) const {
+		sol::state lua;
+		lua.script( R"(
+function r ()
+	return 1 + 1		
+end
+)" );
+		auto fun = [ & ] ( int run_index ) {
+			// Measure cost of lua calling and returning a function
+			sol::function r = lua[ "r" ];
+			return r.call<int>( );
+		};
+		meter.measure( fun );
+	}
+};
+
+struct c_direct_bench {
+	void operator () ( nonius::chronometer meter ) const {
+		sol::state lua;
+		lua.script( R"(
+function r ()
+	return 1 + 1		
+end
+)" );
+
+		lua_State* L = lua.lua_state( );
+		meter.measure( [ & ] ( int run_index ) {
+			lua_getglobal( L, "r" );
+			lua_call( L, 0, 1 );
+			int lua_out = (int)lua_tonumber( L, -1 );
+			lua_pop( L, 1 );
+			return lua_out;
+		} );
+	}
+};
+
+NONIUS_BENCHMARK( "sol - function_result", sol_function_result_bench() );
+NONIUS_BENCHMARK( "sol - int", sol_direct_bench() );
+NONIUS_BENCHMARK( "C - int", c_direct_bench( ) );

sol/function.hpp

@@ -128,40 +128,40 @@ private:
         int stack;
         handler(const reference& target) : target(target), stack(0) {
             if (target.valid()) {
-                stack = lua_gettop(target.state()) + 1;
+                stack = lua_gettop(target.lua_state()) + 1;
                 target.push();
             }
         }
         ~handler() {
             if (stack > 0) {
-                lua_remove(target.state(), stack);
+                lua_remove(target.lua_state(), stack);
             }
         }
     };
 
     int luacodecall(std::ptrdiff_t argcount, std::ptrdiff_t resultcount, handler& h) const {
-        return lua_pcallk(state(), static_cast<int>(argcount), static_cast<int>(resultcount), h.stack, 0, nullptr);
+        return lua_pcallk(lua_state(), static_cast<int>(argcount), static_cast<int>(resultcount), h.stack, 0, nullptr);
     }
 
     void luacall(std::ptrdiff_t argcount, std::ptrdiff_t resultcount, handler& h) const {
-        lua_callk(state(), static_cast<int>(argcount), static_cast<int>(resultcount), 0, nullptr);
+        lua_callk(lua_state(), static_cast<int>(argcount), static_cast<int>(resultcount), 0, nullptr);
     }
 
     template<std::size_t... I, typename... Ret>
     std::tuple<Ret...> invoke(indices<I...>, types<Ret...>, std::ptrdiff_t n, handler& h) const {
         luacall(n, sizeof...(Ret), h);
         const int nreturns = static_cast<int>(sizeof...(Ret));
-        const int stacksize = lua_gettop(state());
+        const int stacksize = lua_gettop(lua_state());
         const int firstreturn = std::max(0, stacksize - nreturns) + 1;
-        auto r = std::make_tuple(stack::get<Ret>(state(), firstreturn + I)...);
+        auto r = std::make_tuple(stack::get<Ret>(lua_state(), firstreturn + I)...);
-        lua_pop(state(), nreturns);
+        lua_pop(lua_state(), nreturns);
         return r;
     }
 
     template<std::size_t I, typename Ret>
     Ret invoke(indices<I>, types<Ret>, std::ptrdiff_t n, handler& h) const {
         luacall(n, 1, h);
-        return stack::pop<Ret>(state());
+        return stack::pop<Ret>(lua_state());
     }
 
     template <std::size_t I>
@@ -171,7 +171,7 @@ private:
 
     function_result invoke(indices<>, types<>, std::ptrdiff_t n, handler& h) const {
         const bool handlerpushed = error_handler.valid();
-        const int stacksize = lua_gettop(state());
+        const int stacksize = lua_gettop(lua_state());
         const int firstreturn = std::max(0, stacksize - static_cast<int>(n) - 1);
         int code = LUA_OK;
         try {
@@ -181,27 +181,27 @@ private:
         catch (const std::exception& error) {
             code = LUA_ERRRUN;
 		  h.stack = 0;
-            stack::push(state(), error.what());
+            stack::push(lua_state(), error.what());
         }
         // TODO: handle idiots?
         /*catch (const char* error) {
             code = LUA_ERRRUN;
-            stack::push(state(), error);
+            stack::push(lua_state(), error);
         }
         catch (const std::string& error) {
             code = LUA_ERRRUN;
-            stack::push(state(), error);
+            stack::push(lua_state(), error);
         }
         catch (...) {
             code = LUA_ERRRUN;
-            stack::push( state(), "[sol] an unknownable runtime exception occurred" );
+            stack::push( lua_state(), "[sol] an unknownable runtime exception occurred" );
         }*/
         catch (...) {
             throw;
         }
-        const int poststacksize = lua_gettop(state());
+        const int poststacksize = lua_gettop(lua_state());
         const int returncount = poststacksize - firstreturn;
-        return function_result(state(), firstreturn + ( handlerpushed ? 0 : 1 ), returncount, static_cast<call_error>(code));
+        return function_result(lua_state(), firstreturn + ( handlerpushed ? 0 : 1 ), returncount, static_cast<call_error>(code));
     }
 
 public:
@@ -232,7 +232,7 @@ public:
     -> decltype(invoke(types<Ret...>(), types<Ret...>(), 0, std::declval<handler&>())) {
         handler h(error_handler);
         push();
-        int pushcount = stack::push_args(state(), std::forward<Args>(args)...);
+        int pushcount = stack::push_args(lua_state(), std::forward<Args>(args)...);
         auto tr = types<Ret...>();
         return invoke(tr, tr, pushcount, h);
     }

sol/object.hpp

@@ -33,14 +33,14 @@ public:
     object() = default;
 
     template<typename T>
-    auto as() const -> decltype(stack::get<T>(state())) const {
+    auto as() const -> decltype(stack::get<T>(lua_state())) const {
         push();
-        type actual = stack::get<type>(state());
+        type actual = stack::get<type>(lua_state());
         // This code is actually present
         // in almost all of the type-getters,
         // and it thus insanely redundant
-        // type_assert(state(), -1, type_of<T>(), actual);
+        // type_assert(lua_state(), -1, type_of<T>(), actual);
-        return stack::pop<T>(state());
+        return stack::pop<T>(lua_state());
     }
 
     template<typename T>

sol/reference.hpp

@@ -97,7 +97,7 @@ public:
         return static_cast<type>(result);
     }
 
-    lua_State* state() const noexcept {
+    lua_State* lua_state() const noexcept {
         return L;
     }
 };

sol/state.hpp

@@ -30,7 +30,7 @@ namespace sol {
 namespace detail {
 inline int atpanic(lua_State* L) {
     const char* message = lua_tostring(L, -1);
-    std::string err = message ? message : "An unexpected error occured and forced the lua state to call atpanic";
+    std::string err = message ? message : "An unexpected error occurred and forced the lua state to call atpanic";
     throw error(err);
 }
 } // detail
@@ -53,18 +53,12 @@ class state {
 private:
     std::unique_ptr<lua_State, void(*)(lua_State*)> L;
     table reg;
-    table global;
+    global_table globals;
 public:
     state(lua_CFunction panic = detail::atpanic):
     L(luaL_newstate(), lua_close),
     reg(L.get(), LUA_REGISTRYINDEX),
-#if SOL_LUA_VERSION < 502
+    globals(detail::global_overload, reg) {
-    // Global table is just a special index
-    global(L.get(), LUA_GLOBALSINDEX) {
-#else
-    // Global tables are stored in the environment/registry table
-    global(reg.get<table>(LUA_RIDX_GLOBALS)) {
-#endif // Lua 5.2
         set_panic(panic);
     }
 
@@ -152,13 +146,13 @@ public:
 
     template<typename... Args, typename... Keys>
     auto get(Keys&&... keys) const
-    -> decltype(global.get<Args...>(std::forward<Keys>(keys)...)) {
+    -> decltype(globals.get<Args...>(std::forward<Keys>(keys)...)) {
-        return global.get<Args...>(std::forward<Keys>(keys)...);
+        return globals.get<Args...>(std::forward<Keys>(keys)...);
     }
 
     template<typename T, typename U>
     state& set(T&& key, U&& value) {
-        global.set(std::forward<T>(key), std::forward<U>(value));
+        globals.set(std::forward<T>(key), std::forward<U>(value));
         return *this;
     }
 
@@ -189,7 +183,7 @@ public:
 
     template<typename Key, typename T>
     state& set_usertype(Key&& key, usertype<T>& user) {
-        global.set_usertype(std::forward<Key>(key), user);
+        globals.set_usertype(std::forward<Key>(key), user);
         return *this;
     }
 
@@ -208,7 +202,7 @@ public:
 
     template <typename Fx>
     void for_each(Fx&& fx) {
-        global.for_each(std::forward<Fx>(fx));
+        globals.for_each(std::forward<Fx>(fx));
     }
 
     template<typename T>
@@ -216,7 +210,7 @@ public:
         lua_createtable(L.get(), narr, nrec);
         table result(L.get());
         lua_pop(L.get(), 1);
-        global.set(std::forward<T>(key), result);
+        globals.set(std::forward<T>(key), result);
         return result;
     }
 
@@ -227,8 +221,8 @@ public:
         return result;
     }
 
-    table global_table() const {
+    global_table global() const {
-        return global;
+        return globals;
     }
 
     table registry() const {
@@ -240,42 +234,42 @@ public:
     }
 
     template<typename T>
-    proxy<table, T> operator[](T&& key) {
+    proxy<global_table, T> operator[](T&& key) {
-        return global[std::forward<T>(key)];
+        return globals[std::forward<T>(key)];
     }
 
     template<typename T>
-    proxy<const table, T> operator[](T&& key) const {
+    proxy<const global_table, T> operator[](T&& key) const {
-        return global[std::forward<T>(key)];
+        return globals[std::forward<T>(key)];
     }
 
     template<typename... Args, typename R, typename Key>
     state& set_function(Key&& key, R fun_ptr(Args...)){
-        global.set_function(std::forward<Key>(key), fun_ptr);
+        globals.set_function(std::forward<Key>(key), fun_ptr);
         return *this;
     }
 
     template<typename Sig, typename Key>
     state& set_function(Key&& key, Sig* fun_ptr){
-        global.set_function(std::forward<Key>(key), fun_ptr);
+        globals.set_function(std::forward<Key>(key), fun_ptr);
         return *this;
     }
 
     template<typename... Args, typename R, typename C, typename T, typename Key>
     state& set_function(Key&& key, R (C::*mem_ptr)(Args...), T&& obj) {
-        global.set_function(std::forward<Key>(key), mem_ptr, std::forward<T>(obj));
+        globals.set_function(std::forward<Key>(key), mem_ptr, std::forward<T>(obj));
         return *this;
     }
 
     template<typename Sig, typename C, typename T, typename Key>
     state& set_function(Key&& key, Sig C::* mem_ptr, T&& obj) {
-        global.set_function(std::forward<Key>(key), mem_ptr, std::forward<T>(obj));
+        globals.set_function(std::forward<Key>(key), mem_ptr, std::forward<T>(obj));
         return *this;
     }
 
     template<typename... Sig, typename Fx, typename Key>
     state& set_function(Key&& key, Fx&& fx) {
-        global.set_function<Sig...>(std::forward<Key>(key), std::forward<Fx>(fx));
+        globals.set_function<Sig...>(std::forward<Key>(key), std::forward<Fx>(fx));
         return *this;
     }
 };

sol/table.hpp

@@ -22,167 +22,10 @@
 #ifndef SOL_TABLE_HPP
 #define SOL_TABLE_HPP
 
-#include "proxy.hpp"
+#include "table_core.hpp"
-#include "stack.hpp"
-#include "function_types.hpp"
-#include "usertype.hpp"
 
 namespace sol {
-class table : public reference {
+	typedef table_core<false> table;
-    friend class state;
-    template<typename T, typename Key>
-    stack::get_return<T> single_get(Key&& key) const {
-        push();
-        stack::push(state(), std::forward<Key>(key));
-        lua_gettable(state(), -2);
-        stack::get_return<T> result = stack::pop<T>(state());
-        pop();
-        return result;
-    }
-
-    template<typename Keys, typename... Ret, std::size_t... I>
-    stack::get_return<Ret...> tuple_get(types<Ret...>, indices<I...>, Keys&& keys) const {
-        return stack::get_return<Ret...>(single_get<Ret>(std::get<I>(keys))...);
-    }
-
-    template<typename Keys, typename Ret, std::size_t I>
-    stack::get_return<Ret> tuple_get(types<Ret>, indices<I>, Keys&& keys) const {
-        return single_get<Ret>(std::get<I>(keys));
-    }
-
-public:
-    table() noexcept : reference() {}
-    table(lua_State* L, int index = -1) : reference(L, index) {
-        type_assert(L, index, type::table);
-    }
-
-    template<typename... Ret, typename... Keys>
-    stack::get_return<Ret...> get( Keys&&... keys ) const {
-        return tuple_get(types<Ret...>(), build_indices<sizeof...(Ret)>(), std::tie(keys...));
-    }
-
-    template<typename T, typename U>
-    table& set(T&& key, U&& value) {
-        push();
-        stack::push(state(), std::forward<T>(key));
-        stack::push(state(), std::forward<U>(value));
-        lua_settable(state(), -3);
-        lua_pop(state(), 1);
-        return *this;
-    }
-
-    template<typename T>
-    SOL_DEPRECATED table& set_userdata(usertype<T>& user) {
-        return set_usertype(user);
-    }
-
-    template<typename Key, typename T>
-    SOL_DEPRECATED table& set_userdata(Key&& key, usertype<T>& user) {
-        return set_usertype(std::forward<Key>(key), user);
-    }
-
-    template<typename T>
-    table& set_usertype(usertype<T>& user) {
-        return set_usertype(usertype_traits<T>::name, user);
-    }
-
-    template<typename Key, typename T>
-    table& set_usertype(Key&& key, usertype<T>& user) {
-        push();
-        stack::push(state(), std::forward<Key>(key));
-        stack::push(state(), user);
-        lua_settable(state(), -3);
-        lua_pop(state(), 1);
-        return *this;
-    }
-
-    template<typename Fx>
-    void for_each(Fx&& fx) const {
-        push();
-        stack::push(state(), nil);
-        while (lua_next(this->state(), -2)) {
-            sol::object key(state(), -2);
-            sol::object value(state(), -1);
-            fx(key, value);
-            lua_pop(state(), 1);
-        }
-        pop();
-    }
-
-    size_t size() const {
-        push();
-        size_t result = lua_rawlen(state(), -1);
-        pop();
-        return result;
-    }
-
-    template<typename T>
-    proxy<table, T> operator[]( T&& key ) {
-        return proxy<table, T>( *this, std::forward<T>( key ) );
-    }
-
-    template<typename T>
-    proxy<const table, T> operator[]( T&& key ) const {
-        return proxy<const table, T>( *this, std::forward<T>( key ) );
-    }
-
-    void pop(int n = 1) const noexcept {
-        lua_pop(state(), n);
-    }
-
-    template<typename... Args, typename R, typename Key>
-    table& set_function(Key&& key, R fun_ptr(Args...)){
-        set_resolved_function(std::forward<Key>(key), fun_ptr);
-        return *this;
-    }
-
-    template<typename Sig, typename Key>
-    table& set_function(Key&& key, Sig* fun_ptr){
-        set_resolved_function(std::forward<Key>(key), fun_ptr);
-        return *this;
-    }
-
-    template<typename... Args, typename R, typename C, typename T, typename Key>
-    table& set_function(Key&& key, R (C::*mem_ptr)(Args...), T&& obj) {
-        set_resolved_function(std::forward<Key>(key), mem_ptr, std::forward<T>(obj));
-        return *this;
-    }
-
-    template<typename Sig, typename C, typename T, typename Key>
-    table& set_function(Key&& key, Sig C::* mem_ptr, T&& obj) {
-        set_resolved_function(std::forward<Key>(key), mem_ptr, std::forward<T>(obj));
-        return *this;
-    }
-
-    template<typename... Sig, typename Fx, typename Key>
-    table& set_function(Key&& key, Fx&& fx) {
-        set_fx(types<Sig...>(), std::forward<Key>(key), std::forward<Fx>(fx));
-        return *this;
-    }
-
-private:
-    template<typename R, typename... Args, typename Fx, typename Key, typename = typename std::result_of<Fx(Args...)>::type>
-    void set_fx(types<R(Args...)>, Key&& key, Fx&& fx) {
-        set_resolved_function<R(Args...)>(std::forward<Key>(key), std::forward<Fx>(fx));
-    }
-
-    template<typename Fx, typename Key>
-    void set_fx(types<>, Key&& key, Fx&& fx) {
-        typedef Unqualified<Unwrap<Fx>> fx_t;
-        typedef decltype(&fx_t::operator()) Sig;
-        set_fx(types<function_signature_t<Sig>>(), std::forward<Key>(key), std::forward<Fx>(fx));
-    }
-
-    template<typename... Sig, typename... Args, typename Key>
-    void set_resolved_function(Key&& key, Args&&... args) {
-        std::string fkey(std::forward<Key>(key));
-        push();
-        int tabletarget = lua_gettop(state());
-        stack::push<function_sig_t<Sig...>>(state(), std::forward<Args>(args)...);
-        lua_setfield(state(), tabletarget, fkey.c_str());
-        pop();
-    }
-};
 } // sol
 
 #endif // SOL_TABLE_HPP

sol/table_core.hpp

@@ -0,0 +1,224 @@
+// The MIT License (MIT)
+
+// Copyright (c) 2013-2015 Danny Y., Rapptz
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do so,
+// subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+#ifndef SOL_TABLE_CORE_HPP
+#define SOL_TABLE_CORE_HPP
+
+#include "proxy.hpp"
+#include "stack.hpp"
+#include "function_types.hpp"
+#include "usertype.hpp"
+
+namespace sol {
+namespace detail {
+	struct global_overload_tag { } const global_overload;
+} // detail
+
+template <bool top_level>
+class table_core : public reference {
+	friend class state;
+	template<typename T, typename Key, EnableIf<Not<std::is_arithmetic<Unqualified<Key>>>, Bool<top_level>> = 0>
+	stack::get_return<T> single_get( Key&& key ) const {
+		lua_getglobal( lua_state( ), &key[ 0 ] );
+		stack::get_return<T> result = stack::pop<T>( lua_state( ) );
+		return result;
+	}
+
+	template<typename T, typename Key, DisableIf<Not<std::is_arithmetic<Unqualified<Key>>>, Bool<top_level>> = 0>
+	stack::get_return<T> single_get( Key&& key ) const {
+		push( );
+		stack::push( lua_state( ), std::forward<Key>( key ) );
+		lua_gettable( lua_state( ), -2 );
+		stack::get_return<T> result = stack::pop<T>( lua_state( ) );
+		pop( );
+		return result;
+	}
+
+	template<typename Keys, typename... Ret, std::size_t... I>
+	stack::get_return<Ret...> tuple_get( types<Ret...>, indices<I...>, Keys&& keys ) const {
+		return stack::get_return<Ret...>( single_get<Ret>( std::get<I>( keys ) )... );
+	}
+
+	template<typename Keys, typename Ret, std::size_t I>
+	stack::get_return<Ret> tuple_get( types<Ret>, indices<I>, Keys&& keys ) const {
+		return single_get<Ret>( std::get<I>( keys ) );
+	}
+
+#if SOL_LUA_VERSION < 502
+	table_core( detail::global_overload_tag, const table_core<false>& reg ) noexcept : reference( reg.lua_state(), LUA_GLOBALSINDEX ) { }
+#else
+	table_core( detail::global_overload_tag, const table& reg ) noexcept : reference( reg.get<table>( LUA_RIDX_GLOBALS ) ) { }
+#endif
+public:
+	table_core( ) noexcept : reference( ) { }
+	table_core( const table_core<true>& global ) : reference( global ) { }
+	table_core( lua_State* L, int index = -1 ) : reference( L, index ) {
+		type_assert( L, index, type::table );
+	}
+
+	template<typename... Ret, typename... Keys>
+	stack::get_return<Ret...> get( Keys&&... keys ) const {
+		return tuple_get( types<Ret...>( ), build_indices<sizeof...( Ret )>( ), std::tie( keys... ) );
+	}
+
+	template<typename T, typename U>
+	table_core& set( T&& key, U&& value ) {
+		if ( top_level ) {
+			stack::push( lua_state( ), std::forward<U>( value ) );
+			lua_setglobal( lua_state( ), &key[0] );
+		}
+		else {
+			push( );
+			stack::push( lua_state( ), std::forward<T>( key ) );
+			stack::push( lua_state( ), std::forward<U>( value ) );
+			lua_settable( lua_state( ), -3 );
+			pop( );
+		}
+		return *this;
+	}
+
+	template<typename T>
+	SOL_DEPRECATED table_core& set_userdata( usertype<T>& user ) {
+		return set_usertype( user );
+	}
+
+	template<typename Key, typename T>
+	SOL_DEPRECATED table_core& set_userdata( Key&& key, usertype<T>& user ) {
+		return set_usertype( std::forward<Key>( key ), user );
+	}
+
+	template<typename T>
+	table_core& set_usertype( usertype<T>& user ) {
+		return set_usertype( usertype_traits<T>::name, user );
+	}
+
+	template<typename Key, typename T>
+	table_core& set_usertype( Key&& key, usertype<T>& user ) {
+		if ( top_level ) {
+			stack::push( lua_state( ), user );
+			lua_setglobal( lua_state( ), &key[ 0 ] );
+			pop( );
+		}
+		else {
+			push( );
+			stack::push( lua_state( ), std::forward<Key>( key ) );
+			stack::push( lua_state( ), user );
+			lua_settable( lua_state( ), -3 );
+			pop( );
+		}
+		return *this;
+	}
+
+	template<typename Fx>
+	void for_each( Fx&& fx ) const {
+		push( );
+		stack::push( lua_state( ), nil );
+		while ( lua_next( this->lua_state( ), -2 ) ) {
+			sol::object key( lua_state( ), -2 );
+			sol::object value( lua_state( ), -1 );
+			fx( key, value );
+			lua_pop( lua_state( ), 1 );
+		}
+		pop( );
+	}
+
+	size_t size( ) const {
+		push( );
+		size_t result = lua_rawlen( lua_state( ), -1 );
+		pop( );
+		return result;
+	}
+
+	template<typename T>
+	proxy<table_core, T> operator[]( T&& key ) {
+		return proxy<table_core, T>( *this, std::forward<T>( key ) );
+	}
+
+	template<typename T>
+	proxy<const table_core, T> operator[]( T&& key ) const {
+		return proxy<const table_core, T>( *this, std::forward<T>( key ) );
+	}
+
+	void pop( int n = 1 ) const noexcept {
+		lua_pop( lua_state( ), n );
+	}
+
+	template<typename... Args, typename R, typename Key>
+	table_core& set_function( Key&& key, R fun_ptr( Args... ) ) {
+		set_resolved_function( std::forward<Key>( key ), fun_ptr );
+		return *this;
+	}
+
+	template<typename Sig, typename Key>
+	table_core& set_function( Key&& key, Sig* fun_ptr ) {
+		set_resolved_function( std::forward<Key>( key ), fun_ptr );
+		return *this;
+	}
+
+	template<typename... Args, typename R, typename C, typename T, typename Key>
+	table_core& set_function( Key&& key, R( C::*mem_ptr )( Args... ), T&& obj ) {
+		set_resolved_function( std::forward<Key>( key ), mem_ptr, std::forward<T>( obj ) );
+		return *this;
+	}
+
+	template<typename Sig, typename C, typename T, typename Key>
+	table_core& set_function( Key&& key, Sig C::* mem_ptr, T&& obj ) {
+		set_resolved_function( std::forward<Key>( key ), mem_ptr, std::forward<T>( obj ) );
+		return *this;
+	}
+
+	template<typename... Sig, typename Fx, typename Key>
+	table_core& set_function( Key&& key, Fx&& fx ) {
+		set_fx( types<Sig...>( ), std::forward<Key>( key ), std::forward<Fx>( fx ) );
+		return *this;
+	}
+
+private:
+	template<typename R, typename... Args, typename Fx, typename Key, typename = typename std::result_of<Fx( Args... )>::type>
+	void set_fx( types<R( Args... )>, Key&& key, Fx&& fx ) {
+		set_resolved_function<R( Args... )>( std::forward<Key>( key ), std::forward<Fx>( fx ) );
+	}
+
+	template<typename Fx, typename Key>
+	void set_fx( types<>, Key&& key, Fx&& fx ) {
+		typedef Unqualified<Unwrap<Fx>> fx_t;
+		typedef decltype( &fx_t::operator() ) Sig;
+		set_fx( types<function_signature_t<Sig>>( ), std::forward<Key>( key ), std::forward<Fx>( fx ) );
+	}
+
+	template<typename... Sig, typename... Args, typename Key, EnableIf<Not<std::is_arithmetic<Unqualified<Key>>>, Bool<top_level>> = 0>
+	void set_resolved_function( Key&& key, Args&&... args ) {
+		stack::push<function_sig_t<Sig...>>( lua_state( ), std::forward<Args>( args )... );
+		lua_setglobal( lua_state( ), &key[ 0 ] );
+	}
+
+	template<typename... Sig, typename... Args, typename Key, DisableIf<Not<std::is_arithmetic<Unqualified<Key>>>, Bool<top_level>> = 0>
+	void set_resolved_function( Key&& key, Args&&... args ) {
+		push( );
+		int tabletarget = lua_gettop( lua_state( ) );
+		stack::push<function_sig_t<Sig...>>( lua_state( ), std::forward<Args>( args )... );
+		lua_setfield( lua_state( ), tabletarget, &key[ 0 ] );
+		pop( );
+	}
+};
+} // sol
+
+#endif // SOL_TABLE_CORE_HPP

sol/types.hpp

@@ -121,7 +121,10 @@ inline std::string type_name(lua_State*L, type t) {
 
 template<typename T>
 class usertype;
-class table;
+template <bool>
+class table_core;
+typedef table_core<false> table;
+typedef table_core<true> global_table;
 class function;
 class object;
 

tests.cpp

@@ -597,7 +597,7 @@ TEST_CASE("tables/operator[]", "Check if operator[] retrieval and setting works
         std::cout << a << ',' << b << '\n';
     };
 
-    REQUIRE_NOTHROW(assert1(lua.global_table()));
+    REQUIRE_NOTHROW(assert1(lua.global()));
 }
 
 TEST_CASE("tables/usertype", "Show that we can create classes from usertype and use them") {