C++ bindings needed to use system_allocator's free() too

src/bindings/cpp/hammer/hammer.hpp

@@ -2,6 +2,7 @@
 #define HAMMER_HAMMER__HPP
 
 #include "../../../hammer.h"
+#include "../../../internal.h"
 #include <string>
 #include <stdint.h>
 #include <cstdarg>
@@ -49,7 +50,7 @@ namespace hammer {
     std::string asUnambiguous() {
       char* buf = h_write_result_unamb(token);
       std::string s = std::string(buf);
-      free(buf);
+      (&system_allocator)->free(&system_allocator, buf);
       return s;
     }
   };

src/internal.h

@@ -28,6 +28,11 @@
 #include <string.h>
 #include "hammer.h"
 
+/* "Internal" in this case means "we're not ready to commit
+ * to a public API." Many structures and routines here will be
+ * useful in client programs.
+ */
+
 #ifdef NDEBUG
 #define assert_message(check, message) do { } while(0)
 #else