Namespace: go.std.io

v1.0

Contents

• Summary
• Index
• Constants
• Variables
• Functions, Macros, and Special Forms
• Types

Summary

Provides a low-level interface to the io package.

Package io provides basic interfaces to I/O primitives.
Its primary job is to wrap existing implementations of such primitives,
such as those in package os, into shared public interfaces that
abstract the functionality, plus some other related primitives.

Because these interfaces and primitives wrap lower-level operations with
various implementations, unless otherwise informed clients should not
assume they are safe for parallel execution.

Index

• *LimitedReader
• *PipeReader
• *PipeWriter
• *SectionReader
• ByteReader
• ByteScanner
• ByteWriter
• Closer
• Copy
• CopyBuffer
• CopyN
• Discard
• EOF
• ErrClosedPipe
• ErrNoProgress
• ErrShortBuffer
• ErrShortWrite
• ErrUnexpectedEOF
• LimitReader
• LimitedReader
• MultiReader
• MultiWriter
• NewSectionReader
• NopCloser
• Pipe
• PipeReader
• PipeWriter
• ReadAll
• ReadAtLeast
• ReadCloser
• ReadFull
• ReadSeekCloser
• ReadSeeker
• ReadWriteCloser
• ReadWriteSeeker
• ReadWriter
• Reader
• ReaderAt
• ReaderFrom
• RuneReader
• RuneScanner
• SectionReader
• SeekCurrent
• SeekEnd
• SeekStart
• Seeker
• StringWriter
• TeeReader
• WriteCloser
• WriteSeeker
• WriteString
• Writer
• WriterAt
• WriterTo
• arrayOfByteReader
• arrayOfByteScanner
• arrayOfByteWriter
• arrayOfCloser
• arrayOfLimitedReader
• arrayOfPipeReader
• arrayOfPipeWriter
• arrayOfReadCloser
• arrayOfReadSeekCloser
• arrayOfReadSeeker
• arrayOfReadWriteCloser
• arrayOfReadWriteSeeker
• arrayOfReadWriter
• arrayOfReader
• arrayOfReaderAt
• arrayOfReaderFrom
• arrayOfRuneReader
• arrayOfRuneScanner
• arrayOfSectionReader
• arrayOfSeeker
• arrayOfStringWriter
• arrayOfWriteCloser
• arrayOfWriteSeeker
• arrayOfWriter
• arrayOfWriterAt
• arrayOfWriterTo

Legend

Constant Variable Function Macro Special form Type GoVar Receiver/Method

Constants

Constants are variables with :const true in their metadata. Joker currently does not recognize them as special; as such, it allows redefining them or their values.

• SeekCurrent

  Int v1.0

  seek relative to the current offset
  

• SeekEnd

  Int v1.0

  seek relative to the end
  

• SeekStart

  Int v1.0

  seek relative to the origin of the file
  

Variables

• Discard

  Var v1.0

  Discard is a Writer on which all Write calls succeed
  without doing anything.
  

• EOF

  Var v1.0

  EOF is the error returned by Read when no more input is available.
  (Read must return EOF itself, not an error wrapping EOF,
  because callers will test for EOF using ==.)
  Functions should return EOF only to signal a graceful end of input.
  If the EOF occurs unexpectedly in a structured data stream,
  the appropriate error is either ErrUnexpectedEOF or some other error
  giving more detail.
  

• ErrClosedPipe

  Var v1.0

  ErrClosedPipe is the error used for read or write operations on a closed pipe.
  

• ErrNoProgress

  Var v1.0

  ErrNoProgress is returned by some clients of a Reader when
  many calls to Read have failed to return any data or error,
  usually the sign of a broken Reader implementation.
  

• ErrShortBuffer

  Var v1.0

  ErrShortBuffer means that a read required a longer buffer than was provided.
  

• ErrShortWrite

  Var v1.0

  ErrShortWrite means that a write accepted fewer bytes than requested
  but failed to return an explicit error.
  

• ErrUnexpectedEOF

  Var v1.0

  ErrUnexpectedEOF means that EOF was encountered in the
  middle of reading a fixed-size block or data structure.
  

Functions, Macros, and Special Forms

• Copy

  Function v1.0

  (Copy dst src)
  

  Copy copies from src to dst until either EOF is reached
  on src or an error occurs. It returns the number of bytes
  copied and the first error encountered while copying, if any.
  
  A successful Copy returns err == nil, not err == EOF.
  Because Copy is defined to read from src until EOF, it does
  not treat an EOF from Read as an error to be reported.
  
  If src implements the WriterTo interface,
  the copy is implemented by calling src.WriteTo(dst).
  Otherwise, if dst implements the ReaderFrom interface,
  the copy is implemented by calling dst.ReadFrom(src).
  
  Go input arguments: (dst Writer, src Reader)
  
  Go returns: (written int64, err error)
  
  Joker input arguments: [^Writer dst, ^Reader src]
  
  Joker returns: [^BigInt written, ^Error err]

• CopyBuffer

  Function v1.0

  (CopyBuffer dst src buf)
  

  CopyBuffer is identical to Copy except that it stages through the
  provided buffer (if one is required) rather than allocating a
  temporary one. If buf is nil, one is allocated; otherwise if it has
  zero length, CopyBuffer panics.
  
  If either src implements WriterTo or dst implements ReaderFrom,
  buf will not be used to perform the copy.
  
  Go input arguments: (dst Writer, src Reader, buf []byte)
  
  Go returns: (written int64, err error)
  
  Joker input arguments: [^Writer dst, ^Reader src, ^arrayOfByte buf]
  
  Joker returns: [^BigInt written, ^Error err]

• CopyN

  Function v1.0

  (CopyN dst src n)
  

  CopyN copies n bytes (or until an error) from src to dst.
  It returns the number of bytes copied and the earliest
  error encountered while copying.
  On return, written == n if and only if err == nil.
  
  If dst implements the ReaderFrom interface,
  the copy is implemented using it.
  
  Go input arguments: (dst Writer, src Reader, n int64)
  
  Go returns: (written int64, err error)
  
  Joker input arguments: [^Writer dst, ^Reader src, ^BigInt n]
  
  Joker returns: [^BigInt written, ^Error err]

• LimitReader

  Function v1.0

  (LimitReader r n)
  

  LimitReader returns a Reader that reads from r
  but stops with EOF after n bytes.
  The underlying implementation is a *LimitedReader.
  
  Go input arguments: (r Reader, n int64)
  
  Go returns: Reader
  
  Joker input arguments: [^Reader r, ^BigInt n]
  
  Joker returns: ^Reader

• MultiReader

  Function v1.0

  (MultiReader & readers)
  

  MultiReader returns a Reader that's the logical concatenation of
  the provided input readers. They're read sequentially. Once all
  inputs have returned EOF, Read will return EOF. If any of the readers
  return a non-nil, non-EOF error, Read will return that error.
  
  Go input arguments: (readers ...Reader)
  
  Go returns: Reader
  
  Joker input arguments: [& ^Reader readers]
  
  Joker returns: ^Reader

• MultiWriter

  Function v1.0

  (MultiWriter & writers)
  

  MultiWriter creates a writer that duplicates its writes to all the
  provided writers, similar to the Unix tee(1) command.
  
  Each write is written to each listed writer, one at a time.
  If a listed writer returns an error, that overall write operation
  stops and returns the error; it does not continue down the list.
  
  Go input arguments: (writers ...Writer)
  
  Go returns: Writer
  
  Joker input arguments: [& ^Writer writers]
  
  Joker returns: ^Writer

• NewSectionReader

  Function v1.0

  (NewSectionReader r off n)
  

  NewSectionReader returns a SectionReader that reads from r
  starting at offset off and stops with EOF after n bytes.
  
  Go input arguments: (r ReaderAt, off int64, n int64)
  
  Go returns: *SectionReader
  
  Joker input arguments: [^ReaderAt r, ^BigInt off, ^BigInt n]
  
  Joker returns: ^*SectionReader

• NopCloser

  Function v1.0

  (NopCloser r)
  

  NopCloser returns a ReadCloser with a no-op Close method wrapping
  the provided Reader r.
  
  Go input arguments: (r Reader)
  
  Go returns: ReadCloser
  
  Joker input arguments: [^Reader r]
  
  Joker returns: ^ReadCloser

• Pipe

  Function v1.0

  (Pipe)
  

  Pipe creates a synchronous in-memory pipe.
  It can be used to connect code expecting an io.Reader
  with code expecting an io.Writer.
  
  Reads and Writes on the pipe are matched one to one
  except when multiple Reads are needed to consume a single Write.
  That is, each Write to the PipeWriter blocks until it has satisfied
  one or more Reads from the PipeReader that fully consume
  the written data.
  The data is copied directly from the Write to the corresponding
  Read (or Reads); there is no internal buffering.
  
  It is safe to call Read and Write in parallel with each other or with Close.
  Parallel calls to Read and parallel calls to Write are also safe:
  the individual calls will be gated sequentially.
  
  Go returns: (*PipeReader, *PipeWriter)
  
  Joker input arguments: []
  
  Joker returns: [^*PipeReader, ^*PipeWriter]

• ReadAll

  Function v1.0

  (ReadAll r)
  

  ReadAll reads from r until an error or EOF and returns the data it read.
  A successful call returns err == nil, not err == EOF. Because ReadAll is
  defined to read from src until EOF, it does not treat an EOF from Read
  as an error to be reported.
  
  Go input arguments: (r Reader)
  
  Go returns: ([]byte, error)
  
  Joker input arguments: [^Reader r]
  
  Joker returns: [^arrayOfByte, ^Error]

• ReadAtLeast

  Function v1.0

  (ReadAtLeast r buf min)
  

  ReadAtLeast reads from r into buf until it has read at least min bytes.
  It returns the number of bytes copied and an error if fewer bytes were read.
  The error is EOF only if no bytes were read.
  If an EOF happens after reading fewer than min bytes,
  ReadAtLeast returns ErrUnexpectedEOF.
  If min is greater than the length of buf, ReadAtLeast returns ErrShortBuffer.
  On return, n >= min if and only if err == nil.
  If r returns an error having read at least min bytes, the error is dropped.
  
  Go input arguments: (r Reader, buf []byte, min int)
  
  Go returns: (n int, err error)
  
  Joker input arguments: [^Reader r, ^arrayOfByte buf, ^Int min]
  
  Joker returns: [^Int n, ^Error err]

• ReadFull

  Function v1.0

  (ReadFull r buf)
  

  ReadFull reads exactly len(buf) bytes from r into buf.
  It returns the number of bytes copied and an error if fewer bytes were read.
  The error is EOF only if no bytes were read.
  If an EOF happens after reading some but not all the bytes,
  ReadFull returns ErrUnexpectedEOF.
  On return, n == len(buf) if and only if err == nil.
  If r returns an error having read at least len(buf) bytes, the error is dropped.
  
  Go input arguments: (r Reader, buf []byte)
  
  Go returns: (n int, err error)
  
  Joker input arguments: [^Reader r, ^arrayOfByte buf]
  
  Joker returns: [^Int n, ^Error err]

• TeeReader

  Function v1.0

  (TeeReader r w)
  

  TeeReader returns a Reader that writes to w what it reads from r.
  All reads from r performed through it are matched with
  corresponding writes to w. There is no internal buffering -
  the write must complete before the read completes.
  Any error encountered while writing is reported as a read error.
  
  Go input arguments: (r Reader, w Writer)
  
  Go returns: Reader
  
  Joker input arguments: [^Reader r, ^Writer w]
  
  Joker returns: ^Reader

• WriteString

  Function v1.0

  (WriteString w s)
  

  WriteString writes the contents of the string s to w, which accepts a slice of bytes.
  If w implements StringWriter, its WriteString method is invoked directly.
  Otherwise, w.Write is called exactly once.
  
  Go input arguments: (w Writer, s string)
  
  Go returns: (n int, err error)
  
  Joker input arguments: [^Writer w, ^String s]
  
  Joker returns: [^Int n, ^Error err]

Types

• *LimitedReader

  Concrete Type v1.0

  A LimitedReader reads from R but limits the amount of
  data returned to just N bytes. Each call to Read
  updates N to reflect the new amount remaining.
  Read returns EOF when N <= 0 or when the underlying R returns EOF.
  

• Read

  Receiver for *LimitedReader v1.0

  ([p])
  

• *PipeReader

  Concrete Type v1.0

  A PipeReader is the read half of a pipe.
  

• Close

  Receiver for *PipeReader v1.0

  ([])
  

  Close closes the reader; subsequent writes to the
  write half of the pipe will return the error ErrClosedPipe.
  

• CloseWithError

  Receiver for *PipeReader v1.0

  ([err])
  

  CloseWithError closes the reader; subsequent writes
  to the write half of the pipe will return the error err.
  
  CloseWithError never overwrites the previous error if it exists
  and always returns nil.
  

• Read

  Receiver for *PipeReader v1.0

  ([data])
  

  Read implements the standard Read interface:
  it reads data from the pipe, blocking until a writer
  arrives or the write end is closed.
  If the write end is closed with an error, that error is
  returned as err; otherwise err is EOF.
  

• *PipeWriter

  Concrete Type v1.0

  A PipeWriter is the write half of a pipe.
  

• Close

  Receiver for *PipeWriter v1.0

  ([])
  

  Close closes the writer; subsequent reads from the
  read half of the pipe will return no bytes and EOF.
  

• CloseWithError

  Receiver for *PipeWriter v1.0

  ([err])
  

  CloseWithError closes the writer; subsequent reads from the
  read half of the pipe will return no bytes and the error err,
  or EOF if err is nil.
  
  CloseWithError never overwrites the previous error if it exists
  and always returns nil.
  

• Write

  Receiver for *PipeWriter v1.0

  ([data])
  

  Write implements the standard Write interface:
  it writes data to the pipe, blocking until one or more readers
  have consumed all the data or the read end is closed.
  If the read end is closed with an error, that err is
  returned as err; otherwise err is ErrClosedPipe.
  

• *SectionReader

  Concrete Type v1.0

  SectionReader implements Read, Seek, and ReadAt on a section
  of an underlying ReaderAt.
  

• Read

  Receiver for *SectionReader v1.0

  ([p])
  

• ReadAt

  Receiver for *SectionReader v1.0

  ([p off])
  

• Seek

  Receiver for *SectionReader v1.0

  ([offset whence])
  

• Size

  Receiver for *SectionReader v1.0

  ([])
  

  Size returns the size of the section in bytes.
  

• ByteReader

  Abstract Type v1.0

  ByteReader is the interface that wraps the ReadByte method.
  
  ReadByte reads and returns the next byte from the input or
  any error encountered. If ReadByte returns an error, no input
  byte was consumed, and the returned byte value is undefined.
  
  ReadByte provides an efficient interface for byte-at-time
  processing. A Reader that does not implement ByteReader
  can be wrapped using bufio.NewReader to add this method.
  

• ReadByte

  Method for ByteReader v1.0

  ([])
  

• ByteScanner

  Abstract Type v1.0

  ByteScanner is the interface that adds the UnreadByte method to the
  basic ReadByte method.
  
  UnreadByte causes the next call to ReadByte to return the last byte read.
  If the last operation was not a successful call to ReadByte, UnreadByte may
  return an error, unread the last byte read (or the byte prior to the
  last-unread byte), or (in implementations that support the Seeker interface)
  seek to one byte before the current offset.
  

• ReadByte

  Method for ByteScanner v1.0

  ([])
  

• UnreadByte

  Method for ByteScanner v1.0

  ([])
  

• ByteWriter

  Abstract Type v1.0

  ByteWriter is the interface that wraps the WriteByte method.
  

• WriteByte

  Method for ByteWriter v1.0

  ([c])
  

• Closer

  Abstract Type v1.0

  Closer is the interface that wraps the basic Close method.
  
  The behavior of Close after the first call is undefined.
  Specific implementations may document their own behavior.
  

• Close

  Method for Closer v1.0

  ([])
  

• LimitedReader

  Concrete Type v1.0

  A LimitedReader reads from R but limits the amount of
  data returned to just N bytes. Each call to Read
  updates N to reflect the new amount remaining.
  Read returns EOF when N <= 0 or when the underlying R returns EOF.
  

• PipeReader

  Concrete Type v1.0

  A PipeReader is the read half of a pipe.
  

• PipeWriter

  Concrete Type v1.0

  A PipeWriter is the write half of a pipe.
  

• ReadCloser

  Abstract Type v1.0

  ReadCloser is the interface that groups the basic Read and Close methods.
  

• Close

  Method for ReadCloser v1.0

  ([])
  

• Read

  Method for ReadCloser v1.0

  ([p])
  

• ReadSeekCloser

  Abstract Type v1.0

  ReadSeekCloser is the interface that groups the basic Read, Seek and Close
  methods.
  

• Close

  Method for ReadSeekCloser v1.0

  ([])
  

• Read

  Method for ReadSeekCloser v1.0

  ([p])
  

• Seek

  Method for ReadSeekCloser v1.0

  ([offset whence])
  

• ReadSeeker

  Abstract Type v1.0

  ReadSeeker is the interface that groups the basic Read and Seek methods.
  

• Read

  Method for ReadSeeker v1.0

  ([p])
  

• Seek

  Method for ReadSeeker v1.0

  ([offset whence])
  

• ReadWriteCloser

  Abstract Type v1.0

  ReadWriteCloser is the interface that groups the basic Read, Write and Close methods.
  

• Close

  Method for ReadWriteCloser v1.0

  ([])
  

• Read

  Method for ReadWriteCloser v1.0

  ([p])
  

• Write

  Method for ReadWriteCloser v1.0

  ([p])
  

• ReadWriteSeeker

  Abstract Type v1.0

  ReadWriteSeeker is the interface that groups the basic Read, Write and Seek methods.
  

• Read

  Method for ReadWriteSeeker v1.0

  ([p])
  

• Seek

  Method for ReadWriteSeeker v1.0

  ([offset whence])
  

• Write

  Method for ReadWriteSeeker v1.0

  ([p])
  

• ReadWriter

  Abstract Type v1.0

  ReadWriter is the interface that groups the basic Read and Write methods.
  

• Read

  Method for ReadWriter v1.0

  ([p])
  

• Write

  Method for ReadWriter v1.0

  ([p])
  

• Reader

  Abstract Type v1.0

  Reader is the interface that wraps the basic Read method.
  
  Read reads up to len(p) bytes into p. It returns the number of bytes
  read (0 <= n <= len(p)) and any error encountered. Even if Read
  returns n < len(p), it may use all of p as scratch space during the call.
  If some data is available but not len(p) bytes, Read conventionally
  returns what is available instead of waiting for more.
  
  When Read encounters an error or end-of-file condition after
  successfully reading n > 0 bytes, it returns the number of
  bytes read. It may return the (non-nil) error from the same call
  or return the error (and n == 0) from a subsequent call.
  An instance of this general case is that a Reader returning
  a non-zero number of bytes at the end of the input stream may
  return either err == EOF or err == nil. The next Read should
  return 0, EOF.
  
  Callers should always process the n > 0 bytes returned before
  considering the error err. Doing so correctly handles I/O errors
  that happen after reading some bytes and also both of the
  allowed EOF behaviors.
  
  Implementations of Read are discouraged from returning a
  zero byte count with a nil error, except when len(p) == 0.
  Callers should treat a return of 0 and nil as indicating that
  nothing happened; in particular it does not indicate EOF.
  
  Implementations must not retain p.
  

• Read

  Method for Reader v1.0

  ([p])
  

• ReaderAt

  Abstract Type v1.0

  ReaderAt is the interface that wraps the basic ReadAt method.
  
  ReadAt reads len(p) bytes into p starting at offset off in the
  underlying input source. It returns the number of bytes
  read (0 <= n <= len(p)) and any error encountered.
  
  When ReadAt returns n < len(p), it returns a non-nil error
  explaining why more bytes were not returned. In this respect,
  ReadAt is stricter than Read.
  
  Even if ReadAt returns n < len(p), it may use all of p as scratch
  space during the call. If some data is available but not len(p) bytes,
  ReadAt blocks until either all the data is available or an error occurs.
  In this respect ReadAt is different from Read.
  
  If the n = len(p) bytes returned by ReadAt are at the end of the
  input source, ReadAt may return either err == EOF or err == nil.
  
  If ReadAt is reading from an input source with a seek offset,
  ReadAt should not affect nor be affected by the underlying
  seek offset.
  
  Clients of ReadAt can execute parallel ReadAt calls on the
  same input source.
  
  Implementations must not retain p.
  

• ReadAt

  Method for ReaderAt v1.0

  ([p off])
  

• ReaderFrom

  Abstract Type v1.0

  ReaderFrom is the interface that wraps the ReadFrom method.
  
  ReadFrom reads data from r until EOF or error.
  The return value n is the number of bytes read.
  Any error except EOF encountered during the read is also returned.
  
  The Copy function uses ReaderFrom if available.
  

• ReadFrom

  Method for ReaderFrom v1.0

  ([r])
  

• RuneReader

  Abstract Type v1.0

  RuneReader is the interface that wraps the ReadRune method.
  
  ReadRune reads a single encoded Unicode character
  and returns the rune and its size in bytes. If no character is
  available, err will be set.
  

• ReadRune

  Method for RuneReader v1.0

  ([])
  

• RuneScanner

  Abstract Type v1.0

  RuneScanner is the interface that adds the UnreadRune method to the
  basic ReadRune method.
  
  UnreadRune causes the next call to ReadRune to return the last rune read.
  If the last operation was not a successful call to ReadRune, UnreadRune may
  return an error, unread the last rune read (or the rune prior to the
  last-unread rune), or (in implementations that support the Seeker interface)
  seek to the start of the rune before the current offset.
  

• ReadRune

  Method for RuneScanner v1.0

  ([])
  

• UnreadRune

  Method for RuneScanner v1.0

  ([])
  

• SectionReader

  Concrete Type v1.0

  SectionReader implements Read, Seek, and ReadAt on a section
  of an underlying ReaderAt.
  

• Seeker

  Abstract Type v1.0

  Seeker is the interface that wraps the basic Seek method.
  
  Seek sets the offset for the next Read or Write to offset,
  interpreted according to whence:
  SeekStart means relative to the start of the file,
  SeekCurrent means relative to the current offset, and
  SeekEnd means relative to the end.
  Seek returns the new offset relative to the start of the
  file or an error, if any.
  
  Seeking to an offset before the start of the file is an error.
  Seeking to any positive offset may be allowed, but if the new offset exceeds
  the size of the underlying object the behavior of subsequent I/O operations
  is implementation-dependent.
  

• Seek

  Method for Seeker v1.0

  ([offset whence])
  

• StringWriter

  Abstract Type v1.0

  StringWriter is the interface that wraps the WriteString method.
  

• WriteString

  Method for StringWriter v1.0

  ([s])
  

• WriteCloser

  Abstract Type v1.0

  WriteCloser is the interface that groups the basic Write and Close methods.
  

• Close

  Method for WriteCloser v1.0

  ([])
  

• Write

  Method for WriteCloser v1.0

  ([p])
  

• WriteSeeker

  Abstract Type v1.0

  WriteSeeker is the interface that groups the basic Write and Seek methods.
  

• Seek

  Method for WriteSeeker v1.0

  ([offset whence])
  

• Write

  Method for WriteSeeker v1.0

  ([p])
  

• Writer

  Abstract Type v1.0

  Writer is the interface that wraps the basic Write method.
  
  Write writes len(p) bytes from p to the underlying data stream.
  It returns the number of bytes written from p (0 <= n <= len(p))
  and any error encountered that caused the write to stop early.
  Write must return a non-nil error if it returns n < len(p).
  Write must not modify the slice data, even temporarily.
  
  Implementations must not retain p.
  

• Write

  Method for Writer v1.0

  ([p])
  

• WriterAt

  Abstract Type v1.0

  WriterAt is the interface that wraps the basic WriteAt method.
  
  WriteAt writes len(p) bytes from p to the underlying data stream
  at offset off. It returns the number of bytes written from p (0 <= n <= len(p))
  and any error encountered that caused the write to stop early.
  WriteAt must return a non-nil error if it returns n < len(p).
  
  If WriteAt is writing to a destination with a seek offset,
  WriteAt should not affect nor be affected by the underlying
  seek offset.
  
  Clients of WriteAt can execute parallel WriteAt calls on the same
  destination if the ranges do not overlap.
  
  Implementations must not retain p.
  

• WriteAt

  Method for WriterAt v1.0

  ([p off])
  

• WriterTo

  Abstract Type v1.0

  WriterTo is the interface that wraps the WriteTo method.
  
  WriteTo writes data to w until there's no more data to write or
  when an error occurs. The return value n is the number of bytes
  written. Any error encountered during the write is also returned.
  
  The Copy function uses WriterTo if available.
  

• WriteTo

  Method for WriterTo v1.0

  ([w])
  

• arrayOfByteReader

  Concrete Type v1.0

  ByteReader is the interface that wraps the ReadByte method.
  
  ReadByte reads and returns the next byte from the input or
  any error encountered. If ReadByte returns an error, no input
  byte was consumed, and the returned byte value is undefined.
  
  ReadByte provides an efficient interface for byte-at-time
  processing. A Reader that does not implement ByteReader
  can be wrapped using bufio.NewReader to add this method.
  

• arrayOfByteScanner

  Concrete Type v1.0

  ByteScanner is the interface that adds the UnreadByte method to the
  basic ReadByte method.
  
  UnreadByte causes the next call to ReadByte to return the last byte read.
  If the last operation was not a successful call to ReadByte, UnreadByte may
  return an error, unread the last byte read (or the byte prior to the
  last-unread byte), or (in implementations that support the Seeker interface)
  seek to one byte before the current offset.
  

• arrayOfByteWriter

  Concrete Type v1.0

  ByteWriter is the interface that wraps the WriteByte method.
  

• arrayOfCloser

  Concrete Type v1.0

  Closer is the interface that wraps the basic Close method.
  
  The behavior of Close after the first call is undefined.
  Specific implementations may document their own behavior.
  

• arrayOfLimitedReader

  Concrete Type v1.0

  A LimitedReader reads from R but limits the amount of
  data returned to just N bytes. Each call to Read
  updates N to reflect the new amount remaining.
  Read returns EOF when N <= 0 or when the underlying R returns EOF.
  

• arrayOfPipeReader

  Concrete Type v1.0

  A PipeReader is the read half of a pipe.
  

• arrayOfPipeWriter

  Concrete Type v1.0

  A PipeWriter is the write half of a pipe.
  

• arrayOfReadCloser

  Concrete Type v1.0

  ReadCloser is the interface that groups the basic Read and Close methods.
  

• arrayOfReadSeekCloser

  Concrete Type v1.0

  ReadSeekCloser is the interface that groups the basic Read, Seek and Close
  methods.
  

• arrayOfReadSeeker

  Concrete Type v1.0

  ReadSeeker is the interface that groups the basic Read and Seek methods.
  

• arrayOfReadWriteCloser

  Concrete Type v1.0

  ReadWriteCloser is the interface that groups the basic Read, Write and Close methods.
  

• arrayOfReadWriteSeeker

  Concrete Type v1.0

  ReadWriteSeeker is the interface that groups the basic Read, Write and Seek methods.
  

• arrayOfReadWriter

  Concrete Type v1.0

  ReadWriter is the interface that groups the basic Read and Write methods.
  

• arrayOfReader

  Concrete Type v1.0

  Reader is the interface that wraps the basic Read method.
  
  Read reads up to len(p) bytes into p. It returns the number of bytes
  read (0 <= n <= len(p)) and any error encountered. Even if Read
  returns n < len(p), it may use all of p as scratch space during the call.
  If some data is available but not len(p) bytes, Read conventionally
  returns what is available instead of waiting for more.
  
  When Read encounters an error or end-of-file condition after
  successfully reading n > 0 bytes, it returns the number of
  bytes read. It may return the (non-nil) error from the same call
  or return the error (and n == 0) from a subsequent call.
  An instance of this general case is that a Reader returning
  a non-zero number of bytes at the end of the input stream may
  return either err == EOF or err == nil. The next Read should
  return 0, EOF.
  
  Callers should always process the n > 0 bytes returned before
  considering the error err. Doing so correctly handles I/O errors
  that happen after reading some bytes and also both of the
  allowed EOF behaviors.
  
  Implementations of Read are discouraged from returning a
  zero byte count with a nil error, except when len(p) == 0.
  Callers should treat a return of 0 and nil as indicating that
  nothing happened; in particular it does not indicate EOF.
  
  Implementations must not retain p.
  

• arrayOfReaderAt

  Concrete Type v1.0

  ReaderAt is the interface that wraps the basic ReadAt method.
  
  ReadAt reads len(p) bytes into p starting at offset off in the
  underlying input source. It returns the number of bytes
  read (0 <= n <= len(p)) and any error encountered.
  
  When ReadAt returns n < len(p), it returns a non-nil error
  explaining why more bytes were not returned. In this respect,
  ReadAt is stricter than Read.
  
  Even if ReadAt returns n < len(p), it may use all of p as scratch
  space during the call. If some data is available but not len(p) bytes,
  ReadAt blocks until either all the data is available or an error occurs.
  In this respect ReadAt is different from Read.
  
  If the n = len(p) bytes returned by ReadAt are at the end of the
  input source, ReadAt may return either err == EOF or err == nil.
  
  If ReadAt is reading from an input source with a seek offset,
  ReadAt should not affect nor be affected by the underlying
  seek offset.
  
  Clients of ReadAt can execute parallel ReadAt calls on the
  same input source.
  
  Implementations must not retain p.
  

• arrayOfReaderFrom

  Concrete Type v1.0

  ReaderFrom is the interface that wraps the ReadFrom method.
  
  ReadFrom reads data from r until EOF or error.
  The return value n is the number of bytes read.
  Any error except EOF encountered during the read is also returned.
  
  The Copy function uses ReaderFrom if available.
  

• arrayOfRuneReader

  Concrete Type v1.0

  RuneReader is the interface that wraps the ReadRune method.
  
  ReadRune reads a single encoded Unicode character
  and returns the rune and its size in bytes. If no character is
  available, err will be set.
  

• arrayOfRuneScanner

  Concrete Type v1.0

  RuneScanner is the interface that adds the UnreadRune method to the
  basic ReadRune method.
  
  UnreadRune causes the next call to ReadRune to return the last rune read.
  If the last operation was not a successful call to ReadRune, UnreadRune may
  return an error, unread the last rune read (or the rune prior to the
  last-unread rune), or (in implementations that support the Seeker interface)
  seek to the start of the rune before the current offset.
  

• arrayOfSectionReader

  Concrete Type v1.0

  SectionReader implements Read, Seek, and ReadAt on a section
  of an underlying ReaderAt.
  

• arrayOfSeeker

  Concrete Type v1.0

  Seeker is the interface that wraps the basic Seek method.
  
  Seek sets the offset for the next Read or Write to offset,
  interpreted according to whence:
  SeekStart means relative to the start of the file,
  SeekCurrent means relative to the current offset, and
  SeekEnd means relative to the end.
  Seek returns the new offset relative to the start of the
  file or an error, if any.
  
  Seeking to an offset before the start of the file is an error.
  Seeking to any positive offset may be allowed, but if the new offset exceeds
  the size of the underlying object the behavior of subsequent I/O operations
  is implementation-dependent.
  

• arrayOfStringWriter

  Concrete Type v1.0

  StringWriter is the interface that wraps the WriteString method.
  

• arrayOfWriteCloser

  Concrete Type v1.0

  WriteCloser is the interface that groups the basic Write and Close methods.
  

• arrayOfWriteSeeker

  Concrete Type v1.0

  WriteSeeker is the interface that groups the basic Write and Seek methods.
  

• arrayOfWriter

  Concrete Type v1.0

  Writer is the interface that wraps the basic Write method.
  
  Write writes len(p) bytes from p to the underlying data stream.
  It returns the number of bytes written from p (0 <= n <= len(p))
  and any error encountered that caused the write to stop early.
  Write must return a non-nil error if it returns n < len(p).
  Write must not modify the slice data, even temporarily.
  
  Implementations must not retain p.
  

• arrayOfWriterAt

  Concrete Type v1.0

  WriterAt is the interface that wraps the basic WriteAt method.
  
  WriteAt writes len(p) bytes from p to the underlying data stream
  at offset off. It returns the number of bytes written from p (0 <= n <= len(p))
  and any error encountered that caused the write to stop early.
  WriteAt must return a non-nil error if it returns n < len(p).
  
  If WriteAt is writing to a destination with a seek offset,
  WriteAt should not affect nor be affected by the underlying
  seek offset.
  
  Clients of WriteAt can execute parallel WriteAt calls on the same
  destination if the ranges do not overlap.
  
  Implementations must not retain p.
  

• arrayOfWriterTo

  Concrete Type v1.0

  WriterTo is the interface that wraps the WriteTo method.
  
  WriteTo writes data to w until there's no more data to write or
  when an error occurs. The return value n is the number of bytes
  written. Any error encountered during the write is also returned.
  
  The Copy function uses WriterTo if available.