Refinement of upb_bytesrc interface.

Added a upb_byteregion that tracks a region of
the input buffer; decoders use this instead of
using a upb_bytesrc directly.  upb_byteregion
is also used as the way of passing a string to
a upb_handlers callback.  This symmetry makes
decoders compose better; if you want to take
a parsed string and decode it as something else,
you can take the string directly from the callback
and feed it as input to another parser.

A commented-out version of a pinning interface
is present; I decline to actually implement it
(and accept its extra complexity) until/unless
it is clear that it is actually a win.  But it
is included as a proof-of-concept, to show that
it fits well with the existing interface.

1 files changed, 1 insertions, 0 deletions

diff --git a/tests/test_cpp.cc b/tests/test_cpp.cc
index 11542bf..ecf27bf 100644
--- a/tests/test_cpp.cc
+++ b/tests/test_cpp.cc
@@ -7,6 +7,7 @@
  * Tests for C++ wrappers.
  */
 
+#include <stdio.h>
 #include <iostream>
 #include "upb/def.hpp"
 #include "upb/pb/glue.hpp"