LLVM  7.0.0svn
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 FileAccess : unsigned;
37 enum OpenFlags : unsigned;
39 } // end namespace fs
40 } // end namespace sys
41 
42 /// This class implements an extremely fast bulk output stream that can *only*
43 /// output to a stream. It does not support seeking, reopening, rewinding, line
44 /// buffered disciplines etc. It is a simple buffer that outputs
45 /// a chunk at a time.
46 class raw_ostream {
47 private:
48  /// The buffer is handled in such a way that the buffer is
49  /// uninitialized, unbuffered, or out of space when OutBufCur >=
50  /// OutBufEnd. Thus a single comparison suffices to determine if we
51  /// need to take the slow path to write a single character.
52  ///
53  /// The buffer is in one of three states:
54  /// 1. Unbuffered (BufferMode == Unbuffered)
55  /// 1. Uninitialized (BufferMode != Unbuffered && OutBufStart == 0).
56  /// 2. Buffered (BufferMode != Unbuffered && OutBufStart != 0 &&
57  /// OutBufEnd - OutBufStart >= 1).
58  ///
59  /// If buffered, then the raw_ostream owns the buffer if (BufferMode ==
60  /// InternalBuffer); otherwise the buffer has been set via SetBuffer and is
61  /// managed by the subclass.
62  ///
63  /// If a subclass installs an external buffer using SetBuffer then it can wait
64  /// for a \see write_impl() call to handle the data which has been put into
65  /// this buffer.
66  char *OutBufStart, *OutBufEnd, *OutBufCur;
67 
68  enum BufferKind {
69  Unbuffered = 0,
70  InternalBuffer,
71  ExternalBuffer
72  } BufferMode;
73 
74 public:
75  // color order matches ANSI escape sequence, don't change
76  enum Colors {
77  BLACK = 0,
78  RED,
85  SAVEDCOLOR
86  };
87 
88  explicit raw_ostream(bool unbuffered = false)
89  : BufferMode(unbuffered ? Unbuffered : InternalBuffer) {
90  // Start out ready to flush.
91  OutBufStart = OutBufEnd = OutBufCur = nullptr;
92  }
93 
94  raw_ostream(const raw_ostream &) = delete;
95  void operator=(const raw_ostream &) = delete;
96 
97  virtual ~raw_ostream();
98 
99  /// tell - Return the current offset with the file.
100  uint64_t tell() const { return current_pos() + GetNumBytesInBuffer(); }
101 
102  //===--------------------------------------------------------------------===//
103  // Configuration Interface
104  //===--------------------------------------------------------------------===//
105 
106  /// Set the stream to be buffered, with an automatically determined buffer
107  /// size.
108  void SetBuffered();
109 
110  /// Set the stream to be buffered, using the specified buffer size.
111  void SetBufferSize(size_t Size) {
112  flush();
113  SetBufferAndMode(new char[Size], Size, InternalBuffer);
114  }
115 
116  size_t GetBufferSize() const {
117  // If we're supposed to be buffered but haven't actually gotten around
118  // to allocating the buffer yet, return the value that would be used.
119  if (BufferMode != Unbuffered && OutBufStart == nullptr)
120  return preferred_buffer_size();
121 
122  // Otherwise just return the size of the allocated buffer.
123  return OutBufEnd - OutBufStart;
124  }
125 
126  /// Set the stream to be unbuffered. When unbuffered, the stream will flush
127  /// after every write. This routine will also flush the buffer immediately
128  /// when the stream is being set to unbuffered.
129  void SetUnbuffered() {
130  flush();
131  SetBufferAndMode(nullptr, 0, Unbuffered);
132  }
133 
134  size_t GetNumBytesInBuffer() const {
135  return OutBufCur - OutBufStart;
136  }
137 
138  //===--------------------------------------------------------------------===//
139  // Data Output Interface
140  //===--------------------------------------------------------------------===//
141 
142  void flush() {
143  if (OutBufCur != OutBufStart)
144  flush_nonempty();
145  }
146 
148  if (OutBufCur >= OutBufEnd)
149  return write(C);
150  *OutBufCur++ = C;
151  return *this;
152  }
153 
154  raw_ostream &operator<<(unsigned char C) {
155  if (OutBufCur >= OutBufEnd)
156  return write(C);
157  *OutBufCur++ = C;
158  return *this;
159  }
160 
161  raw_ostream &operator<<(signed char C) {
162  if (OutBufCur >= OutBufEnd)
163  return write(C);
164  *OutBufCur++ = C;
165  return *this;
166  }
167 
169  // Inline fast path, particularly for strings with a known length.
170  size_t Size = Str.size();
171 
172  // Make sure we can use the fast path.
173  if (Size > (size_t)(OutBufEnd - OutBufCur))
174  return write(Str.data(), Size);
175 
176  if (Size) {
177  memcpy(OutBufCur, Str.data(), Size);
178  OutBufCur += Size;
179  }
180  return *this;
181  }
182 
183  raw_ostream &operator<<(const char *Str) {
184  // Inline fast path, particularly for constant strings where a sufficiently
185  // smart compiler will simplify strlen.
186 
187  return this->operator<<(StringRef(Str));
188  }
189 
190  raw_ostream &operator<<(const std::string &Str) {
191  // Avoid the fast path, it would only increase code size for a marginal win.
192  return write(Str.data(), Str.length());
193  }
194 
195  raw_ostream &operator<<(const SmallVectorImpl<char> &Str) {
196  return write(Str.data(), Str.size());
197  }
198 
199  raw_ostream &operator<<(unsigned long N);
200  raw_ostream &operator<<(long N);
201  raw_ostream &operator<<(unsigned long long N);
202  raw_ostream &operator<<(long long N);
203  raw_ostream &operator<<(const void *P);
204 
205  raw_ostream &operator<<(unsigned int N) {
206  return this->operator<<(static_cast<unsigned long>(N));
207  }
208 
210  return this->operator<<(static_cast<long>(N));
211  }
212 
213  raw_ostream &operator<<(double N);
214 
215  /// Output \p N in hexadecimal, without any prefix or padding.
216  raw_ostream &write_hex(unsigned long long N);
217 
218  /// Output a formatted UUID with dash separators.
219  using uuid_t = uint8_t[16];
220  raw_ostream &write_uuid(const uuid_t UUID);
221 
222  /// Output \p Str, turning '\\', '\t', '\n', '"', and anything that doesn't
223  /// satisfy std::isprint into an escape sequence.
224  raw_ostream &write_escaped(StringRef Str, bool UseHexEscapes = false);
225 
226  raw_ostream &write(unsigned char C);
227  raw_ostream &write(const char *Ptr, size_t Size);
228 
229  // Formatted output, see the format() function in Support/Format.h.
231 
232  // Formatted output, see the leftJustify() function in Support/Format.h.
234 
235  // Formatted output, see the formatHex() function in Support/Format.h.
237 
238  // Formatted output, see the formatv() function in Support/FormatVariadic.h.
240 
241  // Formatted output, see the format_bytes() function in Support/Format.h.
243 
244  /// indent - Insert 'NumSpaces' spaces.
245  raw_ostream &indent(unsigned NumSpaces);
246 
247  /// write_zeros - Insert 'NumZeros' nulls.
248  raw_ostream &write_zeros(unsigned NumZeros);
249 
250  /// Changes the foreground color of text that will be output from this point
251  /// forward.
252  /// @param Color ANSI color to use, the special SAVEDCOLOR can be used to
253  /// change only the bold attribute, and keep colors untouched
254  /// @param Bold bold/brighter text, default false
255  /// @param BG if true change the background, default: change foreground
256  /// @returns itself so it can be used within << invocations
258  bool Bold = false,
259  bool BG = false) {
260  (void)Color;
261  (void)Bold;
262  (void)BG;
263  return *this;
264  }
265 
266  /// Resets the colors to terminal defaults. Call this when you are done
267  /// outputting colored text, or before program exit.
268  virtual raw_ostream &resetColor() { return *this; }
269 
270  /// Reverses the foreground and background colors.
271  virtual raw_ostream &reverseColor() { return *this; }
272 
273  /// This function determines if this stream is connected to a "tty" or
274  /// "console" window. That is, the output would be displayed to the user
275  /// rather than being put on a pipe or stored in a file.
276  virtual bool is_displayed() const { return false; }
277 
278  /// This function determines if this stream is displayed and supports colors.
279  virtual bool has_colors() const { return is_displayed(); }
280 
281  //===--------------------------------------------------------------------===//
282  // Subclass Interface
283  //===--------------------------------------------------------------------===//
284 
285 private:
286  /// The is the piece of the class that is implemented by subclasses. This
287  /// writes the \p Size bytes starting at
288  /// \p Ptr to the underlying stream.
289  ///
290  /// This function is guaranteed to only be called at a point at which it is
291  /// safe for the subclass to install a new buffer via SetBuffer.
292  ///
293  /// \param Ptr The start of the data to be written. For buffered streams this
294  /// is guaranteed to be the start of the buffer.
295  ///
296  /// \param Size The number of bytes to be written.
297  ///
298  /// \invariant { Size > 0 }
299  virtual void write_impl(const char *Ptr, size_t Size) = 0;
300 
301  /// Return the current position within the stream, not counting the bytes
302  /// currently in the buffer.
303  virtual uint64_t current_pos() const = 0;
304 
305 protected:
306  /// Use the provided buffer as the raw_ostream buffer. This is intended for
307  /// use only by subclasses which can arrange for the output to go directly
308  /// into the desired output buffer, instead of being copied on each flush.
309  void SetBuffer(char *BufferStart, size_t Size) {
310  SetBufferAndMode(BufferStart, Size, ExternalBuffer);
311  }
312 
313  /// Return an efficient buffer size for the underlying output mechanism.
314  virtual size_t preferred_buffer_size() const;
315 
316  /// Return the beginning of the current stream buffer, or 0 if the stream is
317  /// unbuffered.
318  const char *getBufferStart() const { return OutBufStart; }
319 
320  //===--------------------------------------------------------------------===//
321  // Private Interface
322  //===--------------------------------------------------------------------===//
323 private:
324  /// Install the given buffer and mode.
325  void SetBufferAndMode(char *BufferStart, size_t Size, BufferKind Mode);
326 
327  /// Flush the current buffer, which is known to be non-empty. This outputs the
328  /// currently buffered data and resets the buffer to empty.
329  void flush_nonempty();
330 
331  /// Copy data into the buffer. Size must not be greater than the number of
332  /// unused bytes in the buffer.
333  void copy_to_buffer(const char *Ptr, size_t Size);
334 
335  virtual void anchor();
336 };
337 
338 /// An abstract base class for streams implementations that also support a
339 /// pwrite operation. This is useful for code that can mostly stream out data,
340 /// but needs to patch in a header that needs to know the output size.
342  virtual void pwrite_impl(const char *Ptr, size_t Size, uint64_t Offset) = 0;
343  void anchor() override;
344 
345 public:
346  explicit raw_pwrite_stream(bool Unbuffered = false)
347  : raw_ostream(Unbuffered) {}
348  void pwrite(const char *Ptr, size_t Size, uint64_t Offset) {
349 #ifndef NDBEBUG
350  uint64_t Pos = tell();
351  // /dev/null always reports a pos of 0, so we cannot perform this check
352  // in that case.
353  if (Pos)
354  assert(Size + Offset <= Pos && "We don't support extending the stream");
355 #endif
356  pwrite_impl(Ptr, Size, Offset);
357  }
358 };
359 
360 //===----------------------------------------------------------------------===//
361 // File Output Streams
362 //===----------------------------------------------------------------------===//
363 
364 /// A raw_ostream that writes to a file descriptor.
365 ///
367  int FD;
368  bool ShouldClose;
369 
370  std::error_code EC;
371 
372  uint64_t pos;
373 
374  bool SupportsSeeking;
375 
376  /// See raw_ostream::write_impl.
377  void write_impl(const char *Ptr, size_t Size) override;
378 
379  void pwrite_impl(const char *Ptr, size_t Size, uint64_t Offset) override;
380 
381  /// Return the current position within the stream, not counting the bytes
382  /// currently in the buffer.
383  uint64_t current_pos() const override { return pos; }
384 
385  /// Determine an efficient buffer size.
386  size_t preferred_buffer_size() const override;
387 
388  /// Set the flag indicating that an output error has been encountered.
389  void error_detected(std::error_code EC) { this->EC = EC; }
390 
391  void anchor() override;
392 
393 public:
394  /// Open the specified file for writing. If an error occurs, information
395  /// about the error is put into EC, and the stream should be immediately
396  /// destroyed;
397  /// \p Flags allows optional flags to control how the file will be opened.
398  ///
399  /// As a special case, if Filename is "-", then the stream will use
400  /// STDOUT_FILENO instead of opening a file. This will not close the stdout
401  /// descriptor.
402  raw_fd_ostream(StringRef Filename, std::error_code &EC);
403  raw_fd_ostream(StringRef Filename, std::error_code &EC,
405  raw_fd_ostream(StringRef Filename, std::error_code &EC,
406  sys::fs::FileAccess Access);
407  raw_fd_ostream(StringRef Filename, std::error_code &EC,
408  sys::fs::OpenFlags Flags);
409  raw_fd_ostream(StringRef Filename, std::error_code &EC,
411  sys::fs::OpenFlags Flags);
412 
413  /// FD is the file descriptor that this writes to. If ShouldClose is true,
414  /// this closes the file when the stream is destroyed. If FD is for stdout or
415  /// stderr, it will not be closed.
416  raw_fd_ostream(int fd, bool shouldClose, bool unbuffered=false);
417 
418  ~raw_fd_ostream() override;
419 
420  /// Manually flush the stream and close the file. Note that this does not call
421  /// fsync.
422  void close();
423 
424  bool supportsSeeking() { return SupportsSeeking; }
425 
426  /// Flushes the stream and repositions the underlying file descriptor position
427  /// to the offset specified from the beginning of the file.
428  uint64_t seek(uint64_t off);
429 
430  raw_ostream &changeColor(enum Colors colors, bool bold=false,
431  bool bg=false) override;
432  raw_ostream &resetColor() override;
433 
434  raw_ostream &reverseColor() override;
435 
436  bool is_displayed() const override;
437 
438  bool has_colors() const override;
439 
440  std::error_code error() const { return EC; }
441 
442  /// Return the value of the flag in this raw_fd_ostream indicating whether an
443  /// output error has been encountered.
444  /// This doesn't implicitly flush any pending output. Also, it doesn't
445  /// guarantee to detect all errors unless the stream has been closed.
446  bool has_error() const { return bool(EC); }
447 
448  /// Set the flag read by has_error() to false. If the error flag is set at the
449  /// time when this raw_ostream's destructor is called, report_fatal_error is
450  /// called to report the error. Use clear_error() after handling the error to
451  /// avoid this behavior.
452  ///
453  /// "Errors should never pass silently.
454  /// Unless explicitly silenced."
455  /// - from The Zen of Python, by Tim Peters
456  ///
457  void clear_error() { EC = std::error_code(); }
458 };
459 
460 /// This returns a reference to a raw_ostream for standard output. Use it like:
461 /// outs() << "foo" << "bar";
462 raw_ostream &outs();
463 
464 /// This returns a reference to a raw_ostream for standard error. Use it like:
465 /// errs() << "foo" << "bar";
466 raw_ostream &errs();
467 
468 /// This returns a reference to a raw_ostream which simply discards output.
469 raw_ostream &nulls();
470 
471 //===----------------------------------------------------------------------===//
472 // Output Stream Adaptors
473 //===----------------------------------------------------------------------===//
474 
475 /// A raw_ostream that writes to an std::string. This is a simple adaptor
476 /// class. This class does not encounter output errors.
478  std::string &OS;
479 
480  /// See raw_ostream::write_impl.
481  void write_impl(const char *Ptr, size_t Size) override;
482 
483  /// Return the current position within the stream, not counting the bytes
484  /// currently in the buffer.
485  uint64_t current_pos() const override { return OS.size(); }
486 
487 public:
488  explicit raw_string_ostream(std::string &O) : OS(O) {}
489  ~raw_string_ostream() override;
490 
491  /// Flushes the stream contents to the target string and returns the string's
492  /// reference.
493  std::string& str() {
494  flush();
495  return OS;
496  }
497 };
498 
499 /// A raw_ostream that writes to an SmallVector or SmallString. This is a
500 /// simple adaptor class. This class does not encounter output errors.
501 /// raw_svector_ostream operates without a buffer, delegating all memory
502 /// management to the SmallString. Thus the SmallString is always up-to-date,
503 /// may be used directly and there is no need to call flush().
506 
507  /// See raw_ostream::write_impl.
508  void write_impl(const char *Ptr, size_t Size) override;
509 
510  void pwrite_impl(const char *Ptr, size_t Size, uint64_t Offset) override;
511 
512  /// Return the current position within the stream.
513  uint64_t current_pos() const override;
514 
515 public:
516  /// Construct a new raw_svector_ostream.
517  ///
518  /// \param O The vector to write to; this should generally have at least 128
519  /// bytes free to avoid any extraneous memory overhead.
521  SetUnbuffered();
522  }
523 
524  ~raw_svector_ostream() override = default;
525 
526  void flush() = delete;
527 
528  /// Return a StringRef for the vector contents.
529  StringRef str() { return StringRef(OS.data(), OS.size()); }
530 };
531 
532 /// A raw_ostream that discards all output.
534  /// See raw_ostream::write_impl.
535  void write_impl(const char *Ptr, size_t size) override;
536  void pwrite_impl(const char *Ptr, size_t Size, uint64_t Offset) override;
537 
538  /// Return the current position within the stream, not counting the bytes
539  /// currently in the buffer.
540  uint64_t current_pos() const override;
541 
542 public:
543  explicit raw_null_ostream() = default;
544  ~raw_null_ostream() override;
545 };
546 
548  raw_ostream &OS;
549  SmallVector<char, 0> Buffer;
550 
551 public:
553  ~buffer_ostream() override { OS << str(); }
554 };
555 
556 } // end namespace llvm
557 
558 #endif // LLVM_SUPPORT_RAW_OSTREAM_H
uint64_t CallInst * C
raw_ostream & errs()
This returns a reference to a raw_ostream for standard error.
uint8_t[16] uuid_t
Output a formatted UUID with dash separators.
Definition: raw_ostream.h:219
SI Whole Quad Mode
raw_string_ostream(std::string &O)
Definition: raw_ostream.h:488
Compute iterated dominance frontiers using a linear time algorithm.
Definition: AllocatorList.h:24
buffer_ostream(raw_ostream &OS)
Definition: raw_ostream.h:552
LLVM_ATTRIBUTE_ALWAYS_INLINE size_type size() const
Definition: SmallVector.h:137
A raw_ostream that discards all output.
Definition: raw_ostream.h:533
size_t GetBufferSize() const
Definition: raw_ostream.h:116
LLVM_NODISCARD LLVM_ATTRIBUTE_ALWAYS_INLINE size_t size() const
size - Get the string size.
Definition: StringRef.h:138
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:257
A raw_ostream that writes to an SmallVector or SmallString.
Definition: raw_ostream.h:504
raw_ostream & operator<<(const std::string &Str)
Definition: raw_ostream.h:190
std::error_code error() const
Definition: raw_ostream.h:440
raw_ostream & operator<<(const char *Str)
Definition: raw_ostream.h:183
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:128
This is a helper class for left_justify, right_justify, and center_justify.
Definition: Format.h:129
raw_ostream & operator<<(int N)
Definition: raw_ostream.h:209
void SetBuffer(char *BufferStart, size_t Size)
Use the provided buffer as the raw_ostream buffer.
Definition: raw_ostream.h:309
This is a helper class used for handling formatted output.
Definition: Format.h:38
raw_ostream & operator<<(char C)
Definition: raw_ostream.h:147
raw_ostream & outs()
This returns a reference to a raw_ostream for standard output.
#define P(N)
void SetUnbuffered()
Set the stream to be unbuffered.
Definition: raw_ostream.h:129
raw_ostream & operator<<(unsigned char C)
Definition: raw_ostream.h:154
void pwrite(const char *Ptr, size_t Size, uint64_t Offset)
Definition: raw_ostream.h:348
virtual raw_ostream & reverseColor()
Reverses the foreground and background colors.
Definition: raw_ostream.h:271
const char * getBufferStart() const
Return the beginning of the current stream buffer, or 0 if the stream is unbuffered.
Definition: raw_ostream.h:318
raw_ostream(bool unbuffered=false)
Definition: raw_ostream.h:88
static void write(bool isBE, void *P, T V)
virtual bool has_colors() const
This function determines if this stream is displayed and supports colors.
Definition: raw_ostream.h:279
void SetBufferSize(size_t Size)
Set the stream to be buffered, using the specified buffer size.
Definition: raw_ostream.h:111
std::string & str()
Flushes the stream contents to the target string and returns the string&#39;s reference.
Definition: raw_ostream.h:493
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:446
This is a helper class used for format_hex() and format_decimal().
Definition: Format.h:164
Color
A "color", which is either even or odd.
auto size(R &&Range, typename std::enable_if< std::is_same< typename std::iterator_traits< decltype(Range.begin())>::iterator_category, std::random_access_iterator_tag >::value, void >::type *=nullptr) -> decltype(std::distance(Range.begin(), Range.end()))
Get the size of a range.
Definition: STLExtras.h:1032
virtual bool is_displayed() const
This function determines if this stream is connected to a "tty" or "console" window.
Definition: raw_ostream.h:276
StringRef str()
Return a StringRef for the vector contents.
Definition: raw_ostream.h:529
raw_ostream & operator<<(unsigned int N)
Definition: raw_ostream.h:205
size_t GetNumBytesInBuffer() const
Definition: raw_ostream.h:134
raw_pwrite_stream(bool Unbuffered=false)
Definition: raw_ostream.h:346
void write_hex(raw_ostream &S, uint64_t N, HexPrintStyle Style, Optional< size_t > Width=None)
A raw_ostream that writes to a file descriptor.
Definition: raw_ostream.h:366
pointer data()
Return a pointer to the vector&#39;s buffer, even if empty().
Definition: SmallVector.h:144
#define N
raw_ostream & operator<<(StringRef Str)
Definition: raw_ostream.h:168
~buffer_ostream() override
Definition: raw_ostream.h:553
raw_ostream & operator<<(raw_ostream &OS, const APInt &I)
Definition: APInt.h:2032
An abstract base class for streams implementations that also support a pwrite operation.
Definition: raw_ostream.h:341
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
A raw_ostream that writes to an std::string.
Definition: raw_ostream.h:477
virtual raw_ostream & resetColor()
Resets the colors to terminal defaults.
Definition: raw_ostream.h:268
constexpr char Size[]
Key for Kernel::Arg::Metadata::mSize.
raw_ostream & nulls()
This returns a reference to a raw_ostream which simply discards output.
uint64_t tell() const
tell - Return the current offset with the file.
Definition: raw_ostream.h:100
This class implements an extremely fast bulk output stream that can only output to a stream...
Definition: raw_ostream.h:46
raw_svector_ostream(SmallVectorImpl< char > &O)
Construct a new raw_svector_ostream.
Definition: raw_ostream.h:520
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:49
raw_ostream & operator<<(signed char C)
Definition: raw_ostream.h:161
void clear_error()
Set the flag read by has_error() to false.
Definition: raw_ostream.h:457