start of a c++ widget toolkit, c++ runtime

1 files changed, 39 insertions, 0 deletions

diff --git a/src/user/include/cxx/structs/dllist.h b/src/user/include/cxx/structs/dllist.h
new file mode 100644
index 0000000..5783364
--- /dev/null
+++ b/src/user/include/cxx/structs/dllist.h
@@ -0,0 +1,39 @@
+#ifndef STRUCTS_DLLIST_H
+#define STRUCTS_DLLIST_H
+
+template<class data>
+class dllist {
+public:
+  class node {
+  public:
+    node *next;
+    node *prev;
+    data d;
+    node(node *next, node *prev, data d)
+      : next(next), prev(prev), d(d) {}
+  };
+  node *first;
+
+  dllist() : first(0) {}
+
+  void add_front(data d) {
+    node *const n = new node(first, 0, d);
+    if (first)
+      first->prev = n;
+    first = n;
+  }
+
+  //return previous, or zero if this is the first
+  node *remove_in_place(node *n) {
+    if (n == first)
+      first = n->next;
+    if (n->next)
+      n->next->prev = n->prev;
+    if (n->prev)
+      n->prev->next = n->next;
+    delete n;
+    return n->prev;
+  }
+};
+
+#endif
\ No newline at end of file