[llvm-commits] [llvm] r76103 - in /llvm/trunk: include/llvm/Support/raw_ostream.h lib/Support/raw_ostream.cpp

[Daniel Dunbar]

Author: ddunbar
Date: Thu Jul 16 16:17:53 2009
New Revision: 76103

URL: http://llvm.org/viewvc/llvm-project?rev=76103&view=rev
Log:
Add raw_null_ostream and llvm::nulls(), a raw_ostream that discards output.
 - No functionality change.

Modified:
    llvm/trunk/include/llvm/Support/raw_ostream.h
    llvm/trunk/lib/Support/raw_ostream.cpp

Modified: llvm/trunk/include/llvm/Support/raw_ostream.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Support/raw_ostream.h?rev=76103&r1=76102&r2=76103&view=diff

==============================================================================
--- llvm/trunk/include/llvm/Support/raw_ostream.h (original)
+++ llvm/trunk/include/llvm/Support/raw_ostream.h Thu Jul 16 16:17:53 2009
@@ -327,6 +327,9 @@
 /// Use it like: errs() << "foo" << "bar";
 raw_ostream &errs();
 
+/// nulls() - This returns a reference to a raw_ostream which simply discards
+/// output.
+raw_ostream &nulls();
 
 //===----------------------------------------------------------------------===//
 // Output Stream Adaptors
@@ -399,6 +402,19 @@
   uint64_t tell();
 };
 
+/// raw_null_ostream - A raw_ostream that discards all output.
+class raw_null_ostream : public raw_ostream {
+  /// write_impl - See raw_ostream::write_impl.
+  virtual void write_impl(const char *Ptr, size_t size);
+  
+  /// current_pos - Return the current position within the stream, not
+  /// counting the bytes currently in the buffer.
+  virtual uint64_t current_pos();
+
+public:
+  explicit raw_null_ostream() {}
+};
+
 } // end llvm namespace
 
 #endif

Modified: llvm/trunk/lib/Support/raw_ostream.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Support/raw_ostream.cpp?rev=76103&r1=76102&r2=76103&view=diff

==============================================================================
--- llvm/trunk/lib/Support/raw_ostream.cpp (original)
+++ llvm/trunk/lib/Support/raw_ostream.cpp Thu Jul 16 16:17:53 2009
@@ -375,6 +375,12 @@
   return S;
 }
 
+/// nulls() - This returns a reference to a raw_ostream which discards output.
+raw_ostream &llvm::nulls() {
+  static raw_null_ostream S;
+  return S;
+}
+
 //===----------------------------------------------------------------------===//
 //  raw_os_ostream
 //===----------------------------------------------------------------------===//
@@ -422,3 +428,14 @@
 uint64_t raw_svector_ostream::tell() { 
   return OS.size() + GetNumBytesInBuffer(); 
 }
+
+//===----------------------------------------------------------------------===//
+//  raw_null_ostream
+//===----------------------------------------------------------------------===//
+
+void raw_null_ostream::write_impl(const char *Ptr, size_t Size) {
+}
+
+uint64_t raw_null_ostream::current_pos() {
+  return 0;
+}