remove NULL (#687)

common.h

@@ -39,10 +39,6 @@ typedef signed char int8;
 #define PROCESSOR_WAITING		0x10000000
 #define PROCESSOR_END			0x20000000
 
-#ifndef NULL
-#define NULL 0
-#endif
-
 #define MASTER_RULE3		3	//Master Rule 3 (2014)
 #define NEW_MASTER_RULE		4	//New Master Rule (2017)
 #define MASTER_RULE_2020	5	//Master Rule 2020

libcard.cpp

@@ -2371,7 +2371,7 @@ int32 scriptlib::card_is_can_be_placed_on_field(lua_State *L) {
 	if(lua_gettop(L) >= 3)
 		tolocation = (uint32)lua_tointeger(L, 3);
 	if(pcard->is_status(STATUS_FORBIDDEN)
-		|| pcard->pduel->game_field->check_unique_onfield(pcard, toplayer, tolocation, NULL))
+		|| pcard->pduel->game_field->check_unique_onfield(pcard, toplayer, tolocation, nullptr))
 		lua_pushboolean(L, 0);
 	else
 		lua_pushboolean(L, 1);
@@ -3696,7 +3696,7 @@ static const struct luaL_Reg cardlib[] = {
 	{ "ResetNegateEffect", scriptlib::card_reset_negate_effect },
 	{ "AssumeProperty", scriptlib::card_assume_prop },
 	{ "SetSPSummonOnce", scriptlib::card_set_spsummon_once },
-	{ NULL, NULL }
+	{ nullptr, nullptr }
 };
 void scriptlib::open_cardlib(lua_State *L) {
 	luaL_newlib(L, cardlib);

libdebug.cpp

@@ -204,7 +204,7 @@ static const struct luaL_Reg debuglib[] = {
 	{ "ReloadFieldEnd", scriptlib::debug_reload_field_end },
 	{ "SetAIName", scriptlib::debug_set_ai_name },
 	{ "ShowHint", scriptlib::debug_show_hint },
-	{ NULL, NULL }
+	{ nullptr, nullptr }
 };
 void scriptlib::open_debuglib(lua_State *L) {
 	luaL_newlib(L, debuglib);

libduel.cpp

@@ -5030,7 +5030,7 @@ static const struct luaL_Reg duellib[] = {
 	{ "IsAbleToEnterBP", scriptlib::duel_is_able_to_enter_bp },
 	{ "SwapDeckAndGrave", scriptlib::duel_swap_deck_and_grave },
 	{ "MajesticCopy", scriptlib::duel_majestic_copy },
-	{ NULL, NULL }
+	{ nullptr, nullptr }
 };
 void scriptlib::open_duellib(lua_State *L) {
 	luaL_newlib(L, duellib);

libeffect.cpp

@@ -659,7 +659,7 @@ static const struct luaL_Reg effectlib[] = {
 	{ "GetActivateSequence", scriptlib::effect_get_activate_sequence },
 	{ "CheckCountLimit", scriptlib::effect_check_count_limit },
 	{ "UseCountLimit", scriptlib::effect_use_count_limit },
-	{ NULL, NULL }
+	{ nullptr, nullptr }
 };
 void scriptlib::open_effectlib(lua_State *L) {
 	luaL_newlib(L, effectlib);

libgroup.cpp

@@ -936,7 +936,7 @@ static const struct luaL_Reg grouplib[] = {
 	{ "__sub", scriptlib::group_meta_sub },
 	{ "__band", scriptlib::group_meta_band },
 	{ "__bxor", scriptlib::group_meta_bxor },
-	{ NULL, NULL }
+	{ nullptr, nullptr }
 };
 void scriptlib::open_grouplib(lua_State *L) {
 	luaL_newlib(L, grouplib);