1 files changed, 64 insertions, 0 deletions
diff --git a/klm/search/header.hh b/klm/search/header.hh
new file mode 100644
index 00000000..69f0eed0
--- /dev/null
+++ b/klm/search/header.hh
@@ -0,0 +1,64 @@
+#ifndef SEARCH_HEADER__
+#define SEARCH_HEADER__
+
+// Header consisting of Score, Arity, and Note
+
+#include "search/types.hh"
+
+#include <stdint.h>
+
+namespace search {
+
+// Copying is shallow.  
+class Header {
+  public:
+    bool Valid() const { return base_; }
+
+    Score GetScore() const {
+      return *reinterpret_cast<const float*>(base_);
+    }
+    void SetScore(Score to) {
+      *reinterpret_cast<float*>(base_) = to;
+    }
+    bool operator<(const Header &other) const {
+      return GetScore() < other.GetScore();
+    }
+    bool operator>(const Header &other) const {
+      return GetScore() > other.GetScore();
+    }
+
+    Arity GetArity() const {
+      return *reinterpret_cast<const Arity*>(base_ + sizeof(Score));
+    }
+
+    Note GetNote() const {
+      return *reinterpret_cast<const Note*>(base_ + sizeof(Score) + sizeof(Arity));
+    }
+    void SetNote(Note to) {
+      *reinterpret_cast<Note*>(base_ + sizeof(Score) + sizeof(Arity)) = to;
+    }
+
+    uint8_t *Base() { return base_; }
+    const uint8_t *Base() const { return base_; }
+
+  protected:
+    Header() : base_(NULL) {}
+
+    explicit Header(void *base) : base_(static_cast<uint8_t*>(base)) {}
+
+    Header(void *base, Arity arity) : base_(static_cast<uint8_t*>(base)) {
+      *reinterpret_cast<Arity*>(base_ + sizeof(Score)) = arity;
+    }
+
+    static const std::size_t kHeaderSize = sizeof(Score) + sizeof(Arity) + sizeof(Note);
+
+    uint8_t *After() { return base_ + kHeaderSize; }
+    const uint8_t *After() const { return base_ + kHeaderSize; }
+
+  private:
+    uint8_t *base_;
+};
+
+} // namespace search
+
+#endif // SEARCH_HEADER__