vendor/llvm/llvm-trunk-r302069

1 files changed, 4 insertions, 2 deletions

diff --git a/include/llvm/Support/BinaryStreamWriter.h b/include/llvm/Support/BinaryStreamWriter.h
index 6734a797ccc4..1b61c32a2541 100644
--- a/include/llvm/Support/BinaryStreamWriter.h
+++ b/include/llvm/Support/BinaryStreamWriter.h
@@ -20,6 +20,7 @@
 #include "llvm/Support/Error.h"
 #include <cstdint>
 #include <type_traits>
+#include <utility>
 
 namespace llvm {
 
@@ -30,8 +31,6 @@ namespace llvm {
 /// although no methods are overridable.
 class BinaryStreamWriter {
 public:
-  // FIXME: We should be able to slice and drop_front etc on Writers / Readers.
-
   BinaryStreamWriter() = default;
   explicit BinaryStreamWriter(WritableBinaryStreamRef Stream);
   virtual ~BinaryStreamWriter() {}
@@ -152,6 +151,9 @@ public:
     return writeStreamRef(Array.getUnderlyingStream());
   }
 
+  /// Splits the Writer into two Writers at a given offset.
+  std::pair<BinaryStreamWriter, BinaryStreamWriter> split(uint32_t Off) const;
+
   void setOffset(uint32_t Off) { Offset = Off; }
   uint32_t getOffset() const { return Offset; }
   uint32_t getLength() const { return Stream.getLength(); }