1 files changed, 4 insertions, 3 deletions

diff --git a/applypatch/include/applypatch/applypatch.h b/applypatch/include/applypatch/applypatch.h
index 52fb58287..da55432d5 100644
--- a/applypatch/include/applypatch/applypatch.h
+++ b/applypatch/include/applypatch/applypatch.h
@@ -20,6 +20,7 @@
 #include <stdint.h>
 #include <sys/stat.h>
 
+#include <functional>
 #include <memory>
 #include <string>
 #include <vector>
@@ -41,7 +42,7 @@ struct FileContents {
 // and use it as the source instead.
 #define CACHE_TEMP_SOURCE "/cache/saved.file"
 
-using SinkFn = size_t (*)(const unsigned char*, size_t, void*);
+using SinkFn = std::function<size_t(const unsigned char*, size_t)>;
 
 // applypatch.cpp
 int ShowLicenses();
@@ -67,13 +68,13 @@ int SaveFileContents(const char* filename, const FileContents* file);
 // bspatch.cpp
 void ShowBSDiffLicense();
 int ApplyBSDiffPatch(const unsigned char* old_data, size_t old_size, const Value* patch,
-                     size_t patch_offset, SinkFn sink, void* token, SHA_CTX* ctx);
+                     size_t patch_offset, SinkFn sink, SHA_CTX* ctx);
 int ApplyBSDiffPatchMem(const unsigned char* old_data, size_t old_size, const Value* patch,
                         size_t patch_offset, std::vector<unsigned char>* new_data);
 
 // imgpatch.cpp
 int ApplyImagePatch(const unsigned char* old_data, size_t old_size, const Value* patch, SinkFn sink,
-                    void* token, SHA_CTX* ctx, const Value* bonus_data);
+                    SHA_CTX* ctx, const Value* bonus_data);
 
 // freecache.cpp
 int MakeFreeSpaceOnCache(size_t bytes_needed);