use default member initializer

card.h

@@ -146,10 +146,10 @@ public:
 			location = 0;
 			sequence = 0;
 		}
-		uint8 playerid;
-		uint8 position;
-		uint8 location;
-		uint8 sequence;
+		uint8 playerid{ 0 };
+		uint8 position{ 0 };
+		uint8 location{ 0 };
+		uint8 sequence{ 0 };
 	};
 	int32 ref_handle;
 	duel* pduel;

effectset.h

@@ -18,8 +18,6 @@ class effect;
 bool effect_sort_id(const effect* e1, const effect* e2);
 
 struct effect_set {
-	effect_set()
-		: count(0), container{ nullptr } {}
 	void add_item(effect* peffect) {
 		if(count >= 64) return;
 		container[count++] = peffect;
@@ -66,11 +64,10 @@ struct effect_set {
 	}
 private:
 	std::array<effect*, 64> container;
-	int count;
+	int count{ 0 };
 };
 
 struct effect_set_v {
-	effect_set_v() {}
 	void add_item(effect* peffect) {
 		container.push_back(peffect);
 	}

field.h

@@ -167,8 +167,8 @@ struct processor {
 	using delayed_effect_collection = std::set<std::pair<effect*, tevent>>;
 	struct chain_limit_t {
 		chain_limit_t(int32 f, int32 p): function(f), player(p) {}
-		int32 function;
-		int32 player;
+		int32 function{ 0 };
+		int32 player{ PLAYER_NONE };
 	};
 	using chain_limit_list = std::vector<chain_limit_t>;
 

operations.cpp

@@ -3856,15 +3856,12 @@ int32 field::send_replace(uint16 step, group * targets, card * target) {
 }
 int32 field::send_to(uint16 step, group * targets, effect * reason_effect, uint32 reason, uint8 reason_player) {
 	struct exargs {
-		group* targets;
+		group* targets{ nullptr };
 		card_set leave_field, leave_grave, leave_deck, detach;
-		bool show_decktop[2];
+		bool show_decktop[2]{ false };
 		card_vector cv;
 		card_vector::iterator cvit;
-		effect* predirect;
-
-		exargs()
-			: targets(nullptr), show_decktop{ FALSE }, predirect(nullptr) {}
+		effect* predirect{ nullptr };
 	} ;
 	switch(step) {
 	case 0: {