Basics of vector space sort of done, but not yet working.

src/vectorspace.h

@@ -0,0 +1,70 @@
+/**
+ *  vectorspace.h
+ *
+ *  Declarations common to all vector space objects.
+ *
+ *
+ *  (c) 2017 Simon Brooke <simon@journeyman.cc>
+ *  Licensed under GPL version 2.0, or, at your option, any later version.
+ */
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+/*
+ * wide characters
+ */
+#include <wchar.h>
+#include <wctype.h>
+
+#include "consspaceobject.h"
+
+#ifndef __vectorspace_h
+#define __vectorspace_h
+
+/*
+ * part of the implementation structure of a namespace.
+ */
+#define HASHTAG "HASH"
+#define HASHTV 0
+
+/*
+ * a namespace (i.e. a binding of names to values, implemented as a hashmap)
+ */
+#define NAMESPACETAG "NMSP"
+#define NAMESPACETV 0
+
+/*
+ * a vector of cons pointers.
+ */
+#define VECTORTAG "VECT"
+#define VECTORTV 0
+
+#define pointer_to_vso(pointer)(vectorpointp(pointer)? pointer2cell(pointer).payload.vectorp.address : 0)
+
+struct cons_pointer make_vso( char *tag, long int payload_size);
+
+struct vector_space_header {
+      union {
+        char bytes[TAGLENGTH];  /* the tag (type) of the
+                                 * vector-space object this cell
+                                 * points to, considered as bytes.
+                                 * NOTE that the vector space object
+                                 * should itself have the identical
+                                 * tag. */
+        uint32_t value;         /* the tag considered as a number */
+    } tag;
+    struct cons_pointer vecp;   /* back pointer to the vector pointer
+                                 * which uniquely points to this vso */
+  uint64_t size;                /* the size of my payload, in bytes */
+  char mark;                    /* mark bit for marking/sweeping the
+                                 * heap (not in this version) */
+  char payload;                 /* we'll malloc `size` bytes for payload,
+                                 * `payload` is just the first of these.
+                                 * TODO: this is almost certainly not
+                                 * idiomatic C. */
+};
+
+#endif
+
+