当我在写一个动态开店线段树

想要用三目运算符时

struct LSGT
{
	int P;
	struct Node
	{
		int l, r;
		int dat, id;
		#define l(x) sgt[x].l
		#define r(x) sgt[x].r
		#define dat(x) sgt[x].dat
		#define id(x) sgt[x].id
		#define ls (p << 1)
		#define rs (ls | 1)
	}sgt[NlogN * 4];
	
	void insert(int p, int l, int r, int pos, int val)
	{
		if (l == r) return dat(p) += val, void();
		int mid = (l(p) + r(p)) >> 1;
		if (pos <= mid) l(p) ? (insert(ls, l, mid, pos, val)) : (l(p) = (++ P));
		else r(p) ? (insert(rs, mid + 1, r, pos, val)) : (r(p) = (++ P));
		
	}
};

(l(p) = (++ P));给我报错了