Channel args comparisons

2 files changed, 9 insertions, 2 deletions

diff --git a/include/grpc/grpc.h b/include/grpc/grpc.h
index be4c4d2b17..1cf5b5513b 100644
--- a/include/grpc/grpc.h
+++ b/include/grpc/grpc.h
@@ -77,6 +77,12 @@ typedef enum {
   GRPC_ARG_POINTER
 } grpc_arg_type;
 
+typedef struct grpc_arg_pointer_vtable {
+  void *(*copy)(void *p);
+  void (*destroy)(void *p);
+  int (*cmp)(void *p, void *q);
+} grpc_arg_pointer_vtable;
+
 /** A single argument... each argument has a key and a value
 
     A note on naming keys:
@@ -97,8 +103,7 @@ typedef struct {
     int integer;
     struct {
       void *p;
-      void *(*copy)(void *p);
-      void (*destroy)(void *p);
+      const grpc_arg_pointer_vtable *vtable;
     } pointer;
   } value;
 } grpc_arg;
diff --git a/include/grpc/support/useful.h b/include/grpc/support/useful.h
index 9f08d788c0..003e096cf9 100644
--- a/include/grpc/support/useful.h
+++ b/include/grpc/support/useful.h
@@ -72,4 +72,6 @@
     0x0f0f0f0f) %                                \
    255)
 
+#define GPR_ICMP(a, b) ((a) < (b) ? -1 : ((a) > (b) ? 1 : 0))
+
 #endif /* GRPC_SUPPORT_USEFUL_H */