Moving source map to Function.

src/xenia/base/arena.h

@@ -12,6 +12,7 @@
 
 #include <cstddef>
 #include <cstdint>
+#include <vector>
 
 namespace xe {
 
@@ -31,6 +32,11 @@ class Arena {
   void Rewind(size_t size);
 
   void* CloneContents();
+  template <typename T>
+  void CloneContents(std::vector<T>& buffer) {
+    buffer.resize(CalculateSize() / sizeof(T));
+    CloneContents(buffer.data(), buffer.size() * sizeof(T));
+  }
 
  private:
   class Chunk {
@@ -45,7 +51,9 @@ class Arena {
     size_t offset;
   };
 
- private:
+  size_t CalculateSize();
+  void CloneContents(void* buffer, size_t buffer_length);
+
   size_t chunk_size_;
   Chunk* head_chunk_;
   Chunk* active_chunk_;