change struct name nr -> Res

Author: fuli

include/btree.h

@@ -53,7 +53,7 @@ namespace alg {
 
 		public:	
 			// node and index
-			struct nr {
+			struct Res {
 				uint32_t offset;
 				int32_t idx;
 			};
@@ -79,7 +79,7 @@ namespace alg {
 				close(fd);
 			}
 
-			nr Search(int32_t x) {
+			Res Search(int32_t x) {
 				node root = ROOT();
 				return search(root, x);
 			}
@@ -113,9 +113,9 @@ namespace alg {
 			/**
 			 * search a key, returns node and index
 			 */
-			nr search(node x, int32_t k) {
+			Res search(node x, int32_t k) {
 				int32_t i = 0;
-				nr ret;
+				Res ret;
 				while (i<x->n && k > x->key[i]) i++;
 
 				if (i<x->n && k == x->key[i]) {	// search in [0,n-1]

src/btree_demo.cpp

@@ -13,7 +13,7 @@ int main(void) {
 
 	for (i=0;i<1000;i++) {
 		x.DeleteKey(i);
-		BTree::nr r = x.Search(i);
+		BTree::Res r = x.Search(i);
 		if (r.idx == -1) {
 			printf("key[%d] removed\n", i);
 		}