1 files changed, 13 insertions, 0 deletions
diff --git a/src/io.h b/src/io.h
index 79216f2..b7c0ebd 100644
--- a/src/io.h
+++ b/src/io.h
@@ -2,15 +2,28 @@
 #define ALGOS_IO_H_INCLUDED
 
 #include <stddef.h>
+#include <stdint.h>
 
 struct stream {
 	size_t n;
 	size_t stride;
+	ssize_t last_idx;
 	int fd;
 	int out;
 	char *name;
 };
 
+/* for array implementation */
+struct entry_a {
+	uint64_t val;
+};
+
+/* for linked list implementation */
+struct entry_l {
+	uint32_t i; /* "pointer" to the next element. */
+	uint64_t val;
+};
+
 int stream_open(struct stream *in);
 int stream_close(struct stream *in);