Input stream wrapper to provide formatted input API, a la C++. More...

#include <fastarduino/streams.h>

Inheritance diagram for streams::istream:

Collaboration diagram for streams::istream:

Public Types
using	MANIPULATOR = void(*)(istream &)
	General type of a manipulator function applicable to this input stream.

Public Types inherited from streams::ios_base
using	iostate = uint8_t
	Bitmask type to represent stream state flags. More...

using	fmtflags = uint16_t
	Bitmask type to represent stream format flags. More...

Public Member Functions
	istream (istreambuf &streambuf)
	Construct a formatted input wrapper of `streambuf`. More...

istream &	operator= (const istream &)=delete

istreambuf &	rdbuf () const
	Return the stream buffer associated with this stream.

int	peek ()
	Return the next character in this input stream, without extracting it. More...

int	get ()
	Extract a single character from this input stream. More...

istream &	get (char &ch)
	Extract a single character from this input stream. More...

istream &	get (char *str, size_t n, char delim='\n')
	Extract characters from this input stream and stores them as a C-string, until either `(n - 1)` characters have been extracted or the `delim` character is encountered. More...

istream &	getline (char *str, size_t n, char delim='\n')
	Extract characters from this input stream and stores them as a C-string, until either `(n - 1)` characters have been extracted or the `delim` character is encountered. More...

istream &	ignore (size_t n=1, int delim=istreambuf::EOF)
	Extract characters from this input stream and discards them, until either `n` characters have been extracted, or the `delim` character is encountered. More...

istream &	read (char *str, size_t n)
	Read a block of data from this input stream. More...

istream &	operator>> (char *buf)
	Read characters from buffer into `buf` until one of these conditions happen: More...

istream &	operator>> (bool &value)
	Input and interpret next character from buffer as a boolean value. More...

istream &	operator>> (char &value)
	Input next character from buffer. More...

istream &	operator>> (int &value)
	Input and interpret next word from buffer as a signed integer value. More...

istream &	operator>> (unsigned int &value)
	Input and interpret next word from buffer as an unsigned integer value. More...

istream &	operator>> (long &value)
	Input and interpret next word from buffer as a signed long integer value. More...

istream &	operator>> (unsigned long &value)
	Input and interpret next word from buffer as an unsigned long integer value. More...

istream &	operator>> (double &value)
	Input and interpret next word from buffer as a floating point value. More...

istream &	operator>> (MANIPULATOR func)
	Apply a `MANIPULATOR` to this input stream. More...

Public Member Functions inherited from streams::ios_base
iostate	rdstate () const
	Return the current stream error state.

void	setstate (iostate state)
	Set the stream error flags state in addition to currently set flags. More...

void	clear (iostate state=goodbit)
	Set the stream error state flags by assigning them the value of `state`. More...

bool	good () const

bool	eof () const
	Return `true` if the associated stream has reached end-of-file. More...

bool	fail () const
	Return `true` if an error has occurred on the associated stream, since last time state was reset (`clear()` was called). More...

bool	bad () const
	Return `true` if a non-recoverable error has occurred on the associated stream. More...

bool	operator! () const
	Return `true` if an error has occurred on the associated stream, since last time state was reset (`clear()` was called). More...

	operator bool () const
	Check that the current stream has no errors. More...

void	flags (fmtflags flags)
	Set new format flags for this stream. More...

fmtflags	flags () const
	Return the format flags currently selected in this stream. More...

void	setf (fmtflags flags)
	Set this stream's format flags whose bits are set in `flags`, leaving unchanged the rest. More...

void	setf (fmtflags flags, fmtflags mask)
	Set this stream's format flags whose bits are set in both `flags` and `mask`, and clears the format flags whose bits are set in `mask` but not in `flags`. More...

void	unsetf (fmtflags flags)
	Clear this stream's format flags whose bits are set in `flags`. More...

char	fill () const
	Return the fill character. More...

void	fill (char fill)
	Set `fill` as new fill character for this stream. More...

void	width (uint8_t width)
	Set minimum width used for displaying values. More...

uint8_t	width () const
	Get the current minimum width value (default = `0`) used for formatted output. More...

void	precision (uint8_t precision)
	Set precision (number of digits after decimal point) used for displaying floating values. More...

uint8_t	precision () const
	Get the current precision (default = `6`) used for formatted floating values output. More...

ios_base &	copyfmt (const ios_base &rhs)
	Copy formatting information from `rhs` to `this` stream. More...

Friends
template<typename FSTREAM >
void	ws (FSTREAM &)
	Manipulator for an input stream, which will swallow all white spaces from that stream. More...

Additional Inherited Members
Static Public Attributes inherited from streams::ios_base
static constexpr iostate	eofbit = 0x01
	This bit is set if the stream has unexpectedly reached its end during an extraction. More...

static constexpr iostate	failbit = 0x02
	This bit is set when an input or operation failed due to a formatting error during extraction.

static constexpr iostate	badbit = 0x04
	This bit is set when an irrecoverable stream error has occurred, e.g. More...

static constexpr iostate	goodbit = 0
	No error; always `0`.

static constexpr fmtflags	dec = 0x0001
	Read or write integral values using decimal (0..9) base format.

static constexpr fmtflags	bin = 0x0002
	Read or write integral values using binary (0,1) base format.

static constexpr fmtflags	oct = 0x0004
	Read or write integral values using octal (0..7) base format.

static constexpr fmtflags	hex = 0x0008
	Read or write integral values using hexadecimal (0..9,A..F) base format.

static constexpr fmtflags	basefield = dec \| bin \| oct \| hex
	Bitmask constant used with `setf(fmtflags, fmtflags)` when changing the output base format. More...

static constexpr fmtflags	left = 0x0010
	Pad all output to `width()` characters, with `fill()` character appended at the end so that the output appears left-adjusted.

static constexpr fmtflags	right = 0x0020
	Pad all output to `width()` characters, with `fill()` character added at the beginning so that the output appears right-adjusted.

static constexpr fmtflags	adjustfield = left \| right
	Bitmask constant used with `setf(fmtflags, fmtflags)` when changing the output adjustment. More...

static constexpr fmtflags	scientific = 0x0040
	Write floating point values in fixed-point notation.

static constexpr fmtflags	fixed = 0x0080
	Write floating point values in scientific notation.

static constexpr fmtflags	floatfield = scientific \| fixed
	Bitmask constant used with `setf(fmtflags, fmtflags)` when changing the floating point output representation. More...

static constexpr fmtflags	boolalpha = 0x0200
	Read or write bool values as alphabetic string (`true` or `false`).

static constexpr fmtflags	showbase = 0x0400
	Write integral values prefixed by their base: More...

static constexpr fmtflags	showpos = 0x1000
	Write non-negative numerical values preceded by `+`.

static constexpr fmtflags	skipws = 0x2000
	Skip leading spaces on certain extraction (read) operations.

static constexpr fmtflags	unitbuf = 0x4000
	Flush output after each insertion operation.

static constexpr fmtflags	uppercase = 0x8000U
	Write uppercase letters instead of lowercase in certain insertion operations. More...

static constexpr uint8_t	MAX_PRECISION = 16
	The maximum allowed precision. More...

Detailed Description

Input stream wrapper to provide formatted input API, a la C++.

Definition at line 356 of file streams.h.

Constructor & Destructor Documentation

◆ istream()

streams::istream::istream ( istreambuf & streambuf )

inlineexplicit

Construct a formatted input wrapper of streambuf.

Parameters

streambuf the input streambuf to be wrapped

Definition at line 363 of file streams.h.

Member Function Documentation

◆ peek()

int streams::istream::peek ( )

inline

Return the next character in this input stream, without extracting it.

The method blocks until one character is available in the underlying istreambuf.

See also: istreambuf::sgetc()

Definition at line 381 of file streams.h.

◆ get() [1/3]

int streams::istream::get ( )

inline

Extract a single character from this input stream.

The method blocks until one character is available in the underlying istreambuf.

See also: istreambuf::sbumpc()

Definition at line 394 of file streams.h.

◆ get() [2/3]

istream& streams::istream::get ( char & ch )

inline

Extract a single character from this input stream.

The method blocks until one character is available in the underlying istreambuf.

See also: get(); istreambuf::sbumpc()

Definition at line 408 of file streams.h.

◆ get() [3/3]

istream& streams::istream::get	(	char *	str,
		size_t	n,
		char	delim = `'\n'`
	)

inline

Extract characters from this input stream and stores them as a C-string, until either (n - 1) characters have been extracted or the delim character is encountered.

The delimiting character is not extracted from the stream and also not added to str. A null character \0 is automatically appended to str.

See also: getline()

Definition at line 422 of file streams.h.

◆ getline()

istream& streams::istream::getline	(	char *	str,
		size_t	n,
		char	delim = `'\n'`
	)

inline

Extract characters from this input stream and stores them as a C-string, until either (n - 1) characters have been extracted or the delim character is encountered.

The delimiting character is extracted from the stream but is not added to str. A null character \0 is automatically appended to str.

See also: get(char*, size_t, char)

Definition at line 442 of file streams.h.

◆ ignore()

istream& streams::istream::ignore	(	size_t	n = `1`,
		int	delim = `istreambuf::EOF`
	)

inline

Extract characters from this input stream and discards them, until either n characters have been extracted, or the delim character is encountered.

The delimiting character, if found, is also discarded. If n is 0, then all characters are discarded (no number limit) until delim is encountered.

Definition at line 461 of file streams.h.

◆ read()

istream& streams::istream::read	(	char *	str,
		size_t	n
	)

inline

Read a block of data from this input stream.

Extracts exactly n characters and copies them to str. The method blocks until n characters have been read.

Definition at line 477 of file streams.h.

◆ operator>>() [1/9]

istream& streams::istream::operator>> ( char * buf )

inline

Read characters from buffer into buf until one of these conditions happen:

a space has been encountered (not read)
width() - 1 characters have been read An ‘’\0'character is added in last position of @p buf. Ifskipws()` is in action, then any white spaces read from the input will be skipped and the first non white space character will be copied first to buf.
Parameters

buf the char array to be filled from the input stream; it must have a minimum size of width().

Returns
this formatted input

Definition at line 495 of file streams.h.

◆ operator>>() [2/9]

istream& streams::istream::operator>> ( bool & value )

inline

Input and interpret next character from buffer as a boolean value.

If read character is '0' then, it will be interpreted as false, any other value will be interpreted as true. If skipws() is in action, then any white spaces read from the input will be skipped and the first non white space character will be used to determine the value to set to value.

bool b;

in >> b;

Parameters

value the boolean value read from the input stream

Returns: this formatted input

Definition at line 520 of file streams.h.

◆ operator>>() [3/9]

istream& streams::istream::operator>> ( char & value )

inline

Input next character from buffer.

If skipws() is in action, then any white spaces read from the input will be skipped and the first non white space character will be used to determine the value to set to value.

char c;

in >> c;

Parameters

value the next character read from the input stream

Returns: this formatted input

Definition at line 540 of file streams.h.

◆ operator>>() [4/9]

istream& streams::istream::operator>> ( int & value )

inline

Input and interpret next word from buffer as a signed integer value.

If skipws() is in action, then any white spaces read from the input will be skipped and the first non white space character will be used to determine the value to set to value.

int i;

in >> i;

Parameters

value the integer value read from the input stream

Returns: this formatted input

Definition at line 559 of file streams.h.

◆ operator>>() [5/9]

istream& streams::istream::operator>> ( unsigned int & value )

inline

Input and interpret next word from buffer as an unsigned integer value.

If skipws() is in action, then any white spaces read from the input will be skipped and the first non white space character will be used to determine the value to set to value.

unsigned int i;

in >> i;

Parameters

value the unsigned integer value read from the input stream

Returns: this formatted input

Definition at line 579 of file streams.h.

◆ operator>>() [6/9]

istream& streams::istream::operator>> ( long & value )

inline

Input and interpret next word from buffer as a signed long integer value.

If skipws() is in action, then any white spaces read from the input will be skipped and the first non white space character will be used to determine the value to set to value.

long i;

in >> i;

Parameters

value the long integer value read from the input stream

Returns: this formatted input

Definition at line 599 of file streams.h.

◆ operator>>() [7/9]

istream& streams::istream::operator>> ( unsigned long & value )

inline

Input and interpret next word from buffer as an unsigned long integer value.

If skipws() is in action, then any white spaces read from the input will be skipped and the first non white space character will be used to determine the value to set to value.

unsigned long i;

in >> i;

Parameters

value the unsigned long integer value read from the input stream

Returns: this formatted input

Definition at line 619 of file streams.h.

◆ operator>>() [8/9]

istream& streams::istream::operator>> ( double & value )

inline

Input and interpret next word from buffer as a floating point value.

If skipws() is in action, then any white spaces read from the input will be skipped and the first non white space character will be used to determine the value to set to value.

double d;

in >> d;

Parameters

value the floating point value read from the input stream

Returns: this formatted input

Definition at line 639 of file streams.h.

◆ operator>>() [9/9]

istream& streams::istream::operator>> ( MANIPULATOR func )

inline

Apply a MANIPULATOR to this input stream.

A manipulator may:

change formatting option (base)
call some method of this input stream

using streams::hex;
 
unsigned int value;
// Read next integral value from `in`; this value is expected to be 
represented in hexadecimal in the input, e.g. 0xABCD.
in >> hex >> value;

Parameters

func	the manipulator to apply to this input stream

Returns: this formatted input

Definition at line 671 of file streams.h.

Friends And Related Function Documentation

◆ ws

template<typename FSTREAM >

void ws ( FSTREAM & stream )

friend

Manipulator for an input stream, which will swallow all white spaces from that stream.

The following sample code puts the next non white space character of in into c:

char c;

in >> ws >> c;

Definition at line 705 of file streams.h.

The documentation for this class was generated from the following files:

fastarduino/streams.h
fastarduino/streams.cpp

Public Types

Public Member Functions

Friends

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ istream()

Member Function Documentation

◆ peek()

◆ get() [1/3]

◆ get() [2/3]

◆ get() [3/3]

◆ getline()

◆ ignore()

◆ read()

◆ operator>>() [1/9]

◆ operator>>() [2/9]

◆ operator>>() [3/9]

◆ operator>>() [4/9]

◆ operator>>() [5/9]

◆ operator>>() [6/9]

◆ operator>>() [7/9]

◆ operator>>() [8/9]

◆ operator>>() [9/9]

Friends And Related Function Documentation

◆ ws