LLVM  4.0.0
raw_ostream.h
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1 //===--- raw_ostream.h - Raw output stream ----------------------*- C++ -*-===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file defines the raw_ostream class.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #ifndef LLVM_SUPPORT_RAW_OSTREAM_H
15 #define LLVM_SUPPORT_RAW_OSTREAM_H
16 
17 #include "llvm/ADT/SmallVector.h"
18 #include "llvm/ADT/StringRef.h"
19 #include <cassert>
20 #include <cstddef>
21 #include <cstdint>
22 #include <cstring>
23 #include <string>
24 #include <system_error>
25 
26 namespace llvm {
27 
28 class formatv_object_base;
29 class format_object_base;
30 class FormattedString;
31 class FormattedNumber;
32 class FormattedBytes;
33 
34 namespace sys {
35 namespace fs {
36 enum OpenFlags : unsigned;
37 } // end namespace fs
38 } // end namespace sys
39 
40 /// This class implements an extremely fast bulk output stream that can *only*
41 /// output to a stream. It does not support seeking, reopening, rewinding, line
42 /// buffered disciplines etc. It is a simple buffer that outputs
43 /// a chunk at a time.
44 class raw_ostream {
45 private:
46  /// The buffer is handled in such a way that the buffer is
47  /// uninitialized, unbuffered, or out of space when OutBufCur >=
48  /// OutBufEnd. Thus a single comparison suffices to determine if we
49  /// need to take the slow path to write a single character.
50  ///
51  /// The buffer is in one of three states:
52  /// 1. Unbuffered (BufferMode == Unbuffered)
53  /// 1. Uninitialized (BufferMode != Unbuffered && OutBufStart == 0).
54  /// 2. Buffered (BufferMode != Unbuffered && OutBufStart != 0 &&
55  /// OutBufEnd - OutBufStart >= 1).
56  ///
57  /// If buffered, then the raw_ostream owns the buffer if (BufferMode ==
58  /// InternalBuffer); otherwise the buffer has been set via SetBuffer and is
59  /// managed by the subclass.
60  ///
61  /// If a subclass installs an external buffer using SetBuffer then it can wait
62  /// for a \see write_impl() call to handle the data which has been put into
63  /// this buffer.
64  char *OutBufStart, *OutBufEnd, *OutBufCur;
65 
66  enum BufferKind {
67  Unbuffered = 0,
68  InternalBuffer,
69  ExternalBuffer
70  } BufferMode;
71 
72 public:
73  // color order matches ANSI escape sequence, don't change
74  enum Colors {
75  BLACK = 0,
76  RED,
84  };
85 
86  explicit raw_ostream(bool unbuffered = false)
87  : BufferMode(unbuffered ? Unbuffered : InternalBuffer) {
88  // Start out ready to flush.
89  OutBufStart = OutBufEnd = OutBufCur = nullptr;
90  }
91 
92  raw_ostream(const raw_ostream &) = delete;
93  void operator=(const raw_ostream &) = delete;
94 
95  virtual ~raw_ostream();
96 
97  /// tell - Return the current offset with the file.
98  uint64_t tell() const { return current_pos() + GetNumBytesInBuffer(); }
99 
100  //===--------------------------------------------------------------------===//
101  // Configuration Interface
102  //===--------------------------------------------------------------------===//
103 
104  /// Set the stream to be buffered, with an automatically determined buffer
105  /// size.
106  void SetBuffered();
107 
108  /// Set the stream to be buffered, using the specified buffer size.
109  void SetBufferSize(size_t Size) {
110  flush();
111  SetBufferAndMode(new char[Size], Size, InternalBuffer);
112  }
113 
114  size_t GetBufferSize() const {
115  // If we're supposed to be buffered but haven't actually gotten around
116  // to allocating the buffer yet, return the value that would be used.
117  if (BufferMode != Unbuffered && OutBufStart == nullptr)
118  return preferred_buffer_size();
119 
120  // Otherwise just return the size of the allocated buffer.
121  return OutBufEnd - OutBufStart;
122  }
123 
124  /// Set the stream to be unbuffered. When unbuffered, the stream will flush
125  /// after every write. This routine will also flush the buffer immediately
126  /// when the stream is being set to unbuffered.
127  void SetUnbuffered() {
128  flush();
129  SetBufferAndMode(nullptr, 0, Unbuffered);
130  }
131 
132  size_t GetNumBytesInBuffer() const {
133  return OutBufCur - OutBufStart;
134  }
135 
136  //===--------------------------------------------------------------------===//
137  // Data Output Interface
138  //===--------------------------------------------------------------------===//
139 
140  void flush() {
141  if (OutBufCur != OutBufStart)
142  flush_nonempty();
143  }
144 
146  if (OutBufCur >= OutBufEnd)
147  return write(C);
148  *OutBufCur++ = C;
149  return *this;
150  }
151 
152  raw_ostream &operator<<(unsigned char C) {
153  if (OutBufCur >= OutBufEnd)
154  return write(C);
155  *OutBufCur++ = C;
156  return *this;
157  }
158 
159  raw_ostream &operator<<(signed char C) {
160  if (OutBufCur >= OutBufEnd)
161  return write(C);
162  *OutBufCur++ = C;
163  return *this;
164  }
165 
167  // Inline fast path, particularly for strings with a known length.
168  size_t Size = Str.size();
169 
170  // Make sure we can use the fast path.
171  if (Size > (size_t)(OutBufEnd - OutBufCur))
172  return write(Str.data(), Size);
173 
174  if (Size) {
175  memcpy(OutBufCur, Str.data(), Size);
176  OutBufCur += Size;
177  }
178  return *this;
179  }
180 
181  raw_ostream &operator<<(const char *Str) {
182  // Inline fast path, particularly for constant strings where a sufficiently
183  // smart compiler will simplify strlen.
184 
185  return this->operator<<(StringRef(Str));
186  }
187 
188  raw_ostream &operator<<(const std::string &Str) {
189  // Avoid the fast path, it would only increase code size for a marginal win.
190  return write(Str.data(), Str.length());
191  }
192 
193  raw_ostream &operator<<(const SmallVectorImpl<char> &Str) {
194  return write(Str.data(), Str.size());
195  }
196 
197  raw_ostream &operator<<(unsigned long N);
198  raw_ostream &operator<<(long N);
199  raw_ostream &operator<<(unsigned long long N);
200  raw_ostream &operator<<(long long N);
201  raw_ostream &operator<<(const void *P);
202 
203  raw_ostream &operator<<(unsigned int N) {
204  return this->operator<<(static_cast<unsigned long>(N));
205  }
206 
208  return this->operator<<(static_cast<long>(N));
209  }
210 
211  raw_ostream &operator<<(double N);
212 
213  /// Output \p N in hexadecimal, without any prefix or padding.
214  raw_ostream &write_hex(unsigned long long N);
215 
216  /// Output \p Str, turning '\\', '\t', '\n', '"', and anything that doesn't
217  /// satisfy std::isprint into an escape sequence.
218  raw_ostream &write_escaped(StringRef Str, bool UseHexEscapes = false);
219 
220  raw_ostream &write(unsigned char C);
221  raw_ostream &write(const char *Ptr, size_t Size);
222 
223  // Formatted output, see the format() function in Support/Format.h.
225 
226  // Formatted output, see the leftJustify() function in Support/Format.h.
228 
229  // Formatted output, see the formatHex() function in Support/Format.h.
231 
232  // Formatted output, see the formatv() function in Support/FormatVariadic.h.
234 
235  // Formatted output, see the format_bytes() function in Support/Format.h.
237 
238  /// indent - Insert 'NumSpaces' spaces.
239  raw_ostream &indent(unsigned NumSpaces);
240 
241  /// Changes the foreground color of text that will be output from this point
242  /// forward.
243  /// @param Color ANSI color to use, the special SAVEDCOLOR can be used to
244  /// change only the bold attribute, and keep colors untouched
245  /// @param Bold bold/brighter text, default false
246  /// @param BG if true change the background, default: change foreground
247  /// @returns itself so it can be used within << invocations
249  bool Bold = false,
250  bool BG = false) {
251  (void)Color;
252  (void)Bold;
253  (void)BG;
254  return *this;
255  }
256 
257  /// Resets the colors to terminal defaults. Call this when you are done
258  /// outputting colored text, or before program exit.
259  virtual raw_ostream &resetColor() { return *this; }
260 
261  /// Reverses the foreground and background colors.
262  virtual raw_ostream &reverseColor() { return *this; }
263 
264  /// This function determines if this stream is connected to a "tty" or
265  /// "console" window. That is, the output would be displayed to the user
266  /// rather than being put on a pipe or stored in a file.
267  virtual bool is_displayed() const { return false; }
268 
269  /// This function determines if this stream is displayed and supports colors.
270  virtual bool has_colors() const { return is_displayed(); }
271 
272  //===--------------------------------------------------------------------===//
273  // Subclass Interface
274  //===--------------------------------------------------------------------===//
275 
276 private:
277  /// The is the piece of the class that is implemented by subclasses. This
278  /// writes the \p Size bytes starting at
279  /// \p Ptr to the underlying stream.
280  ///
281  /// This function is guaranteed to only be called at a point at which it is
282  /// safe for the subclass to install a new buffer via SetBuffer.
283  ///
284  /// \param Ptr The start of the data to be written. For buffered streams this
285  /// is guaranteed to be the start of the buffer.
286  ///
287  /// \param Size The number of bytes to be written.
288  ///
289  /// \invariant { Size > 0 }
290  virtual void write_impl(const char *Ptr, size_t Size) = 0;
291 
292  // An out of line virtual method to provide a home for the class vtable.
293  virtual void handle();
294 
295  /// Return the current position within the stream, not counting the bytes
296  /// currently in the buffer.
297  virtual uint64_t current_pos() const = 0;
298 
299 protected:
300  /// Use the provided buffer as the raw_ostream buffer. This is intended for
301  /// use only by subclasses which can arrange for the output to go directly
302  /// into the desired output buffer, instead of being copied on each flush.
303  void SetBuffer(char *BufferStart, size_t Size) {
304  SetBufferAndMode(BufferStart, Size, ExternalBuffer);
305  }
306 
307  /// Return an efficient buffer size for the underlying output mechanism.
308  virtual size_t preferred_buffer_size() const;
309 
310  /// Return the beginning of the current stream buffer, or 0 if the stream is
311  /// unbuffered.
312  const char *getBufferStart() const { return OutBufStart; }
313 
314  //===--------------------------------------------------------------------===//
315  // Private Interface
316  //===--------------------------------------------------------------------===//
317 private:
318  /// Install the given buffer and mode.
319  void SetBufferAndMode(char *BufferStart, size_t Size, BufferKind Mode);
320 
321  /// Flush the current buffer, which is known to be non-empty. This outputs the
322  /// currently buffered data and resets the buffer to empty.
323  void flush_nonempty();
324 
325  /// Copy data into the buffer. Size must not be greater than the number of
326  /// unused bytes in the buffer.
327  void copy_to_buffer(const char *Ptr, size_t Size);
328 };
329 
330 /// An abstract base class for streams implementations that also support a
331 /// pwrite operation. This is useful for code that can mostly stream out data,
332 /// but needs to patch in a header that needs to know the output size.
334  virtual void pwrite_impl(const char *Ptr, size_t Size, uint64_t Offset) = 0;
335 
336 public:
337  explicit raw_pwrite_stream(bool Unbuffered = false)
338  : raw_ostream(Unbuffered) {}
339  void pwrite(const char *Ptr, size_t Size, uint64_t Offset) {
340 #ifndef NDBEBUG
341  uint64_t Pos = tell();
342  // /dev/null always reports a pos of 0, so we cannot perform this check
343  // in that case.
344  if (Pos)
345  assert(Size + Offset <= Pos && "We don't support extending the stream");
346 #endif
347  pwrite_impl(Ptr, Size, Offset);
348  }
349 };
350 
351 //===----------------------------------------------------------------------===//
352 // File Output Streams
353 //===----------------------------------------------------------------------===//
354 
355 /// A raw_ostream that writes to a file descriptor.
356 ///
358  int FD;
359  bool ShouldClose;
360 
361  /// Error This flag is true if an error of any kind has been detected.
362  ///
363  bool Error;
364 
365  uint64_t pos;
366 
367  bool SupportsSeeking;
368 
369  /// See raw_ostream::write_impl.
370  void write_impl(const char *Ptr, size_t Size) override;
371 
372  void pwrite_impl(const char *Ptr, size_t Size, uint64_t Offset) override;
373 
374  /// Return the current position within the stream, not counting the bytes
375  /// currently in the buffer.
376  uint64_t current_pos() const override { return pos; }
377 
378  /// Determine an efficient buffer size.
379  size_t preferred_buffer_size() const override;
380 
381  /// Set the flag indicating that an output error has been encountered.
382  void error_detected() { Error = true; }
383 
384 public:
385  /// Open the specified file for writing. If an error occurs, information
386  /// about the error is put into EC, and the stream should be immediately
387  /// destroyed;
388  /// \p Flags allows optional flags to control how the file will be opened.
389  ///
390  /// As a special case, if Filename is "-", then the stream will use
391  /// STDOUT_FILENO instead of opening a file. Note that it will still consider
392  /// itself to own the file descriptor. In particular, it will close the
393  /// file descriptor when it is done (this is necessary to detect
394  /// output errors).
395  raw_fd_ostream(StringRef Filename, std::error_code &EC,
397 
398  /// FD is the file descriptor that this writes to. If ShouldClose is true,
399  /// this closes the file when the stream is destroyed.
400  raw_fd_ostream(int fd, bool shouldClose, bool unbuffered=false);
401 
402  ~raw_fd_ostream() override;
403 
404  /// Manually flush the stream and close the file. Note that this does not call
405  /// fsync.
406  void close();
407 
408  bool supportsSeeking() { return SupportsSeeking; }
409 
410  /// Flushes the stream and repositions the underlying file descriptor position
411  /// to the offset specified from the beginning of the file.
412  uint64_t seek(uint64_t off);
413 
414  raw_ostream &changeColor(enum Colors colors, bool bold=false,
415  bool bg=false) override;
416  raw_ostream &resetColor() override;
417 
418  raw_ostream &reverseColor() override;
419 
420  bool is_displayed() const override;
421 
422  bool has_colors() const override;
423 
424  /// Return the value of the flag in this raw_fd_ostream indicating whether an
425  /// output error has been encountered.
426  /// This doesn't implicitly flush any pending output. Also, it doesn't
427  /// guarantee to detect all errors unless the stream has been closed.
428  bool has_error() const {
429  return Error;
430  }
431 
432  /// Set the flag read by has_error() to false. If the error flag is set at the
433  /// time when this raw_ostream's destructor is called, report_fatal_error is
434  /// called to report the error. Use clear_error() after handling the error to
435  /// avoid this behavior.
436  ///
437  /// "Errors should never pass silently.
438  /// Unless explicitly silenced."
439  /// - from The Zen of Python, by Tim Peters
440  ///
441  void clear_error() {
442  Error = false;
443  }
444 };
445 
446 /// This returns a reference to a raw_ostream for standard output. Use it like:
447 /// outs() << "foo" << "bar";
448 raw_ostream &outs();
449 
450 /// This returns a reference to a raw_ostream for standard error. Use it like:
451 /// errs() << "foo" << "bar";
452 raw_ostream &errs();
453 
454 /// This returns a reference to a raw_ostream which simply discards output.
455 raw_ostream &nulls();
456 
457 //===----------------------------------------------------------------------===//
458 // Output Stream Adaptors
459 //===----------------------------------------------------------------------===//
460 
461 /// A raw_ostream that writes to an std::string. This is a simple adaptor
462 /// class. This class does not encounter output errors.
464  std::string &OS;
465 
466  /// See raw_ostream::write_impl.
467  void write_impl(const char *Ptr, size_t Size) override;
468 
469  /// Return the current position within the stream, not counting the bytes
470  /// currently in the buffer.
471  uint64_t current_pos() const override { return OS.size(); }
472 
473 public:
474  explicit raw_string_ostream(std::string &O) : OS(O) {}
475  ~raw_string_ostream() override;
476 
477  /// Flushes the stream contents to the target string and returns the string's
478  /// reference.
479  std::string& str() {
480  flush();
481  return OS;
482  }
483 };
484 
485 /// A raw_ostream that writes to an SmallVector or SmallString. This is a
486 /// simple adaptor class. This class does not encounter output errors.
487 /// raw_svector_ostream operates without a buffer, delegating all memory
488 /// management to the SmallString. Thus the SmallString is always up-to-date,
489 /// may be used directly and there is no need to call flush().
492 
493  /// See raw_ostream::write_impl.
494  void write_impl(const char *Ptr, size_t Size) override;
495 
496  void pwrite_impl(const char *Ptr, size_t Size, uint64_t Offset) override;
497 
498  /// Return the current position within the stream.
499  uint64_t current_pos() const override;
500 
501 public:
502  /// Construct a new raw_svector_ostream.
503  ///
504  /// \param O The vector to write to; this should generally have at least 128
505  /// bytes free to avoid any extraneous memory overhead.
507  SetUnbuffered();
508  }
509 
510  ~raw_svector_ostream() override = default;
511 
512  void flush() = delete;
513 
514  /// Return a StringRef for the vector contents.
515  StringRef str() { return StringRef(OS.data(), OS.size()); }
516 };
517 
518 /// A raw_ostream that discards all output.
520  /// See raw_ostream::write_impl.
521  void write_impl(const char *Ptr, size_t size) override;
522  void pwrite_impl(const char *Ptr, size_t Size, uint64_t Offset) override;
523 
524  /// Return the current position within the stream, not counting the bytes
525  /// currently in the buffer.
526  uint64_t current_pos() const override;
527 
528 public:
529  explicit raw_null_ostream() = default;
530  ~raw_null_ostream() override;
531 };
532 
534  raw_ostream &OS;
535  SmallVector<char, 0> Buffer;
536 
537 public:
539  ~buffer_ostream() override { OS << str(); }
540 };
541 
542 } // end namespace llvm
543 
544 #endif // LLVM_SUPPORT_RAW_OSTREAM_H
~raw_svector_ostream() override=default
bool has_colors() const override
This function determines if this stream is displayed and supports colors.
bool is_displayed() const override
This function determines if this stream is connected to a "tty" or "console" window.
raw_ostream & errs()
This returns a reference to a raw_ostream for standard error.
const char * getBufferStart() const
Return the beginning of the current stream buffer, or 0 if the stream is unbuffered.
Definition: raw_ostream.h:312
SI Whole Quad Mode
raw_string_ostream(std::string &O)
Definition: raw_ostream.h:474
buffer_ostream(raw_ostream &OS)
Definition: raw_ostream.h:538
A raw_ostream that discards all output.
Definition: raw_ostream.h:519
virtual ~raw_ostream()
Definition: raw_ostream.cpp:71
uint64_t seek(uint64_t off)
Flushes the stream and repositions the underlying file descriptor position to the offset specified fr...
virtual bool has_colors() const
This function determines if this stream is displayed and supports colors.
Definition: raw_ostream.h:270
virtual raw_ostream & changeColor(enum Colors Color, bool Bold=false, bool BG=false)
Changes the foreground color of text that will be output from this point forward. ...
Definition: raw_ostream.h:248
raw_ostream & indent(unsigned NumSpaces)
indent - Insert 'NumSpaces' spaces.
A raw_ostream that writes to an SmallVector or SmallString.
Definition: raw_ostream.h:490
raw_ostream & operator<<(const std::string &Str)
Definition: raw_ostream.h:188
raw_ostream & operator<<(const char *Str)
Definition: raw_ostream.h:181
This is a helper class used for left_justify() and right_justify().
Definition: Format.h:129
bool has_error() const
Return the value of the flag in this raw_fd_ostream indicating whether an output error has been encou...
Definition: raw_ostream.h:428
struct fuzzer::@269 Flags
raw_ostream & operator<<(int N)
Definition: raw_ostream.h:207
void SetBuffer(char *BufferStart, size_t Size)
Use the provided buffer as the raw_ostream buffer.
Definition: raw_ostream.h:303
uint64_t tell() const
tell - Return the current offset with the file.
Definition: raw_ostream.h:98
raw_ostream & write_hex(unsigned long long N)
Output N in hexadecimal, without any prefix or padding.
~raw_fd_ostream() override
virtual bool is_displayed() const
This function determines if this stream is connected to a "tty" or "console" window.
Definition: raw_ostream.h:267
LLVM_NODISCARD LLVM_ATTRIBUTE_ALWAYS_INLINE size_t size() const
size - Get the string size.
Definition: StringRef.h:135
This is a helper class used for handling formatted output.
Definition: Format.h:38
raw_ostream & operator<<(char C)
Definition: raw_ostream.h:145
raw_ostream & outs()
This returns a reference to a raw_ostream for standard output.
#define P(N)
raw_ostream & resetColor() override
Resets the colors to terminal defaults.
void SetUnbuffered()
Set the stream to be unbuffered.
Definition: raw_ostream.h:127
raw_ostream & operator<<(unsigned char C)
Definition: raw_ostream.h:152
void pwrite(const char *Ptr, size_t Size, uint64_t Offset)
Definition: raw_ostream.h:339
uint32_t Offset
virtual raw_ostream & reverseColor()
Reverses the foreground and background colors.
Definition: raw_ostream.h:262
raw_fd_ostream(StringRef Filename, std::error_code &EC, sys::fs::OpenFlags Flags)
Open the specified file for writing.
raw_ostream(bool unbuffered=false)
Definition: raw_ostream.h:86
void SetBufferSize(size_t Size)
Set the stream to be buffered, using the specified buffer size.
Definition: raw_ostream.h:109
std::string & str()
Flushes the stream contents to the target string and returns the string's reference.
Definition: raw_ostream.h:479
~raw_null_ostream() override
raw_ostream & write(unsigned char C)
size_t GetBufferSize() const
Definition: raw_ostream.h:114
raw_ostream & write_escaped(StringRef Str, bool UseHexEscapes=false)
Output Str, turning '\', '', ' ', '"', and anything that doesn't satisfy std::isprint into an escape...
This is a helper class used for format_hex() and format_decimal().
Definition: Format.h:155
Color
A "color", which is either even or odd.
StringRef str()
Return a StringRef for the vector contents.
Definition: raw_ostream.h:515
virtual size_t preferred_buffer_size() const
Return an efficient buffer size for the underlying output mechanism.
Definition: raw_ostream.cpp:84
static GCRegistry::Add< ShadowStackGC > C("shadow-stack","Very portable GC for uncooperative code generators")
raw_ostream & operator<<(unsigned int N)
Definition: raw_ostream.h:203
void SetBuffered()
Set the stream to be buffered, with an automatically determined buffer size.
Definition: raw_ostream.cpp:89
raw_pwrite_stream(bool Unbuffered=false)
Definition: raw_ostream.h:337
A raw_ostream that writes to a file descriptor.
Definition: raw_ostream.h:357
pointer data()
Return a pointer to the vector's buffer, even if empty().
Definition: SmallVector.h:142
#define N
LLVM_ATTRIBUTE_ALWAYS_INLINE size_type size() const
Definition: SmallVector.h:135
raw_ostream & operator<<(StringRef Str)
Definition: raw_ostream.h:166
~buffer_ostream() override
Definition: raw_ostream.h:539
void close()
Manually flush the stream and close the file.
An abstract base class for streams implementations that also support a pwrite operation.
Definition: raw_ostream.h:333
void operator=(const raw_ostream &)=delete
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
A raw_ostream that writes to an std::string.
Definition: raw_ostream.h:463
virtual raw_ostream & resetColor()
Resets the colors to terminal defaults.
Definition: raw_ostream.h:259
Lightweight error class with error context and mandatory checking.
raw_ostream & nulls()
This returns a reference to a raw_ostream which simply discards output.
raw_ostream & changeColor(enum Colors colors, bool bold=false, bool bg=false) override
Changes the foreground color of text that will be output from this point forward. ...
This class implements an extremely fast bulk output stream that can only output to a stream...
Definition: raw_ostream.h:44
LLVM_NODISCARD LLVM_ATTRIBUTE_ALWAYS_INLINE const char * data() const
data - Get a pointer to the start of the string (which may not be null terminated).
Definition: StringRef.h:125
raw_svector_ostream(SmallVectorImpl< char > &O)
Construct a new raw_svector_ostream.
Definition: raw_ostream.h:506
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:47
raw_ostream & operator<<(signed char C)
Definition: raw_ostream.h:159
int * Ptr
raw_ostream & reverseColor() override
Reverses the foreground and background colors.
size_t GetNumBytesInBuffer() const
Definition: raw_ostream.h:132
void clear_error()
Set the flag read by has_error() to false.
Definition: raw_ostream.h:441