class FileOutputStream
Defined at line 120 of file ../../third_party/protobuf/src/google/protobuf/io/zero_copy_stream_impl.h
A ZeroCopyOutputStream which writes to a file descriptor.
FileOutputStream is preferred over using an ofstream with
OstreamOutputStream. The latter will introduce an extra layer of buffering,
harming performance. Also, it's conceivable that FileOutputStream could
someday be enhanced to use zero-copy file descriptors on OSs which
support them.
Public Methods
void FileOutputStream (int file_descriptor, int block_size)Creates a stream that writes to the given Unix file descriptor.
If a block_size is given, it specifies the size of the buffers
that should be returned by Next(). Otherwise, a reasonable default
is used.
void FileOutputStream (const FileOutputStream & )Defined at line 128 of file ../../third_party/protobuf/src/google/protobuf/io/zero_copy_stream_impl.h
FileOutputStream & operator= (const FileOutputStream & )Defined at line 129 of file ../../third_party/protobuf/src/google/protobuf/io/zero_copy_stream_impl.h
void ~FileOutputStream ()bool Close ()Flushes any buffers and closes the underlying file. Returns false if
an error occurs during the process; use GetErrno() to examine the error.
Even if an error occurs, the file descriptor is closed when this returns.
void SetCloseOnDelete (bool value)By default, the file descriptor is not closed when the stream is
destroyed. Call SetCloseOnDelete(true) to change that. WARNING:
This leaves no way for the caller to detect if close() fails. If
detecting close() errors is important to you, you should arrange
to close the descriptor yourself.
Defined at line 143 of file ../../third_party/protobuf/src/google/protobuf/io/zero_copy_stream_impl.h
int GetErrno ()If an I/O error has occurred on this file descriptor, this is the
errno from that error. Otherwise, this is zero. Once an error
occurs, the stream is broken and all subsequent operations will
fail.
Defined at line 149 of file ../../third_party/protobuf/src/google/protobuf/io/zero_copy_stream_impl.h