Add move operators for addrmap

A subsequent patch needs to move an addrmap.  This patch adds the
necessary support.  It also changes addrmap_fixed to take a 'const'
addrmap_mutable.  This is fine according to the contract of
addrmap_mutable; but it did require a compensating const_cast in the
implementation.

1 files changed, 18 insertions, 1 deletions

diff --git a/gdb/addrmap.h b/gdb/addrmap.h
index ed52e3c..5378b75 100644
--- a/gdb/addrmap.h
+++ b/gdb/addrmap.h
@@ -85,9 +85,14 @@ struct addrmap_fixed final : public addrmap,
 {
 public:
 
-  addrmap_fixed (struct obstack *obstack, addrmap_mutable *mut);
+  addrmap_fixed (struct obstack *obstack, const addrmap_mutable *mut);
   DISABLE_COPY_AND_ASSIGN (addrmap_fixed);
 
+  /* It's fine to use the default move operators, because this addrmap
+     does not own the storage for the elements.  */
+  addrmap_fixed (addrmap_fixed &&other) = default;
+  addrmap_fixed &operator= (addrmap_fixed &&) = default;
+
   void relocate (CORE_ADDR offset) override;
 
 private:
@@ -124,6 +129,18 @@ public:
   ~addrmap_mutable ();
   DISABLE_COPY_AND_ASSIGN (addrmap_mutable);
 
+  addrmap_mutable (addrmap_mutable &&other)
+    : tree (other.tree)
+  {
+    other.tree = nullptr;
+  }
+
+  addrmap_mutable &operator= (addrmap_mutable &&other)
+  {
+    std::swap (tree, other.tree);
+    return *this;
+  }
+
   /* In the mutable address map MAP, associate the addresses from START
      to END_INCLUSIVE that are currently associated with NULL with OBJ
      instead.  Addresses mapped to an object other than NULL are left