Encapsulation of a double floating-point as an AbstractNumber. More...

#include <tsFloatingPoint.h>

Inheritance diagram for ts::FloatingPoint< FLOAT_T, PREC, type >:

Collaboration diagram for ts::FloatingPoint< FLOAT_T, PREC, type >:

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Public Types
using	float_t = FLOAT_T
	The underlying floating-point type.

using	int_t = int64_t
	An integer type for conversion to integral values.

Public Member Functions
	FloatingPoint ()=default
	Default constructor, implicitly initialized to zero.

template<typename NUM_T , typename std::enable_if< std::is_arithmetic< NUM_T >::value, int >::type = 0>
	FloatingPoint (NUM_T x)
	Constructor from an integer or floating-point value.

FloatingPoint	abs () const
	Get the absolute value.

virtual ts::UString	description () const override
	Get a textual description of the values of that type.

bool	divOverflow (const FloatingPoint &x) const
	Check if this FloatingPoint number generates an overflow when divided by another FloatingPoint.

virtual bool	fromString (const UString &str, UChar separator=COMMA, UChar decimal_dot=FULL_STOP) override
	Parse a string and interpret it as a number.

virtual bool	inRange (int64_t min, int64_t max) const override
	Check if the value of the number is within a range of integer value.

FloatingPoint	max (const FloatingPoint &x) const
	Get the maximum value of two fractions.

FloatingPoint	min (const FloatingPoint &x) const
	Get the minimum value of two fractions.

bool	mulOverflow (const FloatingPoint &x) const
	Check if this FloatingPoint number generates an overflow when multiplied by another FloatingPoint.

template<typename INT2 , typename std::enable_if< std::is_integral< INT2 >::value, int >::type = 0>
bool	mulOverflow (INT2 x) const
	Check if this FloatingPoint number generates an overflow when multiplied by an integer.

virtual double	toDouble () const override
	Conversion to double value.

int_t	toInt () const
	Conversion to integral value.

virtual int64_t	toInt64 () const override
	Conversion to a 64-bit signed integer value.

virtual UString	toString (size_t min_width=0, bool right_justified=true, UChar separator=COMMA, bool force_sign=false, size_t decimals=NPOS, bool force_decimals=false, UChar decimal_dot=FULL_STOP, UChar pad=SPACE) const override
	Convert the number to a string object.

Static Public Attributes
static constexpr size_t	DISPLAY_PRECISION = PREC
	The displayed precision of the floating-point type (number of decimal digits).

static constexpr float_t	EQUAL_PRECISION = 100.0 * std::numeric_limits<float_t>::min()
	Precision of "equal" comparisons.

static const AbstractNumber *const	INVALID
	Pointer to an invalid instance of AbstractNumber.

static const FloatingPoint	MAX
	The maximum representable value of this fraction type.

static const FloatingPoint	MIN
	The minimum representable value of this fraction type.

Static Protected Member Functions
static void	Deformat (UString &str, UChar separator, UChar decimal_dot)
	Static common utility to deformat a string containing a number.

static void	Format (UString &str, size_t min_width, bool right_justified, UChar separator, bool add_plus_sign, size_t decimals, bool force_decimals, UChar decimal_dot, UChar pad)
	Static common utility to format a string containing a number with or without decimal part.

Detailed Description

template<typename FLOAT_T, const size_t PREC = 6, typename std::enable_if< std::is_floating_point< FLOAT_T >::value, int >::type = 0>
class ts::FloatingPoint< FLOAT_T, PREC, type >

Encapsulation of a double floating-point as an AbstractNumber.

Template Parameters

FLOAT_T	The underlying floating-point type.
PREC	The number of decimal digits to display by default. This is a display attribute only, it does not alter the binary representation of floating-point values. The default is to display 6 digits.

Member Typedef Documentation

◆ int_t

template<typename FLOAT_T , const size_t PREC = 6, typename std::enable_if< std::is_floating_point< FLOAT_T >::value, int >::type = 0>

using ts::FloatingPoint< FLOAT_T, PREC, type >::int_t = int64_t

An integer type for conversion to integral values.

Overflow may occur.

Constructor & Destructor Documentation

◆ FloatingPoint()

template<typename FLOAT_T , const size_t PREC = 6, typename std::enable_if< std::is_floating_point< FLOAT_T >::value, int >::type = 0>

template<typename NUM_T , typename std::enable_if< std::is_arithmetic< NUM_T >::value, int >::type = 0>

ts::FloatingPoint< FLOAT_T, PREC, type >::FloatingPoint ( NUM_T x )

inline

Constructor from an integer or floating-point value.

Template Parameters

NUM_T Some integer or floating-point type.

Parameters

[in] x Initial value.

Member Function Documentation

◆ description()

template<typename FLOAT_T , const size_t PREC, typename std::enable_if< std::is_floating_point< FLOAT_T >::value, int >::type N>

ts::UString ts::FloatingPoint< FLOAT_T, PREC, N >::description ( ) const

overridevirtual

Get a textual description of the values of that type.

This is typically used in help texts.

Returns: A textual description of the values of that type.

Implements ts::AbstractNumber.

◆ inRange()

template<typename FLOAT_T , const size_t PREC, typename std::enable_if< std::is_floating_point< FLOAT_T >::value, int >::type N>

bool ts::FloatingPoint< FLOAT_T, PREC, N >::inRange	(	int64_t	min,
		int64_t	max
	)		const

overridevirtual

Check if the value of the number is within a range of integer value.

Parameters

[in]	min	Minimum integer value (inclusive).
[in]	max	Maximum integer value (inclusive).

Returns: True if this number is within the range min to max, inclusive.

Implements ts::AbstractNumber.

◆ toInt64()

template<typename FLOAT_T , const size_t PREC, typename std::enable_if< std::is_floating_point< FLOAT_T >::value, int >::type N>

int64_t ts::FloatingPoint< FLOAT_T, PREC, N >::toInt64 ( ) const

overridevirtual

Conversion to a 64-bit signed integer value.

Returns: The value in integral units. Underflow or overflow rounding is applied when necessary.

Implements ts::AbstractNumber.

◆ toDouble()

template<typename FLOAT_T , const size_t PREC, typename std::enable_if< std::is_floating_point< FLOAT_T >::value, int >::type N>

double ts::FloatingPoint< FLOAT_T, PREC, N >::toDouble ( ) const

overridevirtual

Conversion to double value.

Returns: The value as a double.

Implements ts::AbstractNumber.

◆ fromString()

template<typename FLOAT_T , const size_t PREC, typename std::enable_if< std::is_floating_point< FLOAT_T >::value, int >::type N>

bool ts::FloatingPoint< FLOAT_T, PREC, N >::fromString	(	const UString &	str,
		UChar	separator = `COMMA`,
		UChar	decimal_dot = `FULL_STOP`
	)

overridevirtual

Parse a string and interpret it as a number.

The content of this object is updated from the parsed string.

Parameters

[in]	str	A string to parse, representing this object.
[in]	separator	Separator character for groups of thousands, a comma by default.
[in]	decimal_dot	The decimal separator, a dot by default.

Returns: True if the str is valid, false otherwise. In case of parsing error, the content of this object is undefined.

Implements ts::AbstractNumber.

◆ toString()

template<typename FLOAT_T , const size_t PREC, typename std::enable_if< std::is_floating_point< FLOAT_T >::value, int >::type N>

ts::UString ts::FloatingPoint< FLOAT_T, PREC, N >::toString	(	size_t	min_width = `0`,
		bool	right_justified = `true`,
		UChar	separator = `COMMA`,
		bool	force_sign = `false`,
		size_t	decimals = `NPOS`,
		bool	force_decimals = `false`,
		UChar	decimal_dot = `FULL_STOP`,
		UChar	pad = `SPACE`
	)		const

overridevirtual

Convert the number to a string object.

Parameters

[in]	min_width	Minimum width of the returned string. Padded with pad characters if larger than the number of characters in the formatted number.
[in]	right_justified	If true (the default), return a right-justified string. When false, return a left-justified string. Ignored if min_width is lower than the number of characters in the formatted number.
[in]	separator	Separator character for groups of thousands, a comma by default. CHAR_NULL means no separator.
[in]	force_sign	If true, force a '+' sign for positive values.
[in]	decimals	Precision to use after the decimal point. NPOS means default.
[in]	force_decimals	If true, with positive precision, force a decimal dot and the number of decimal digits of the precision. By default, skip non significant decimal digits.
[in]	decimal_dot	The decimal separator, a dot by default.
[in]	pad	The padding character to adjust the width.

Returns: The formatted string.

Implements ts::AbstractNumber.

◆ toInt()

template<typename FLOAT_T , const size_t PREC = 6, typename std::enable_if< std::is_floating_point< FLOAT_T >::value, int >::type = 0>

int_t ts::FloatingPoint< FLOAT_T, PREC, type >::toInt ( ) const

inline

Conversion to integral value.

Returns: The value in integral units. Underflow or overflow rounding is applied when necessary.

◆ abs()

template<typename FLOAT_T , const size_t PREC = 6, typename std::enable_if< std::is_floating_point< FLOAT_T >::value, int >::type = 0>

FloatingPoint ts::FloatingPoint< FLOAT_T, PREC, type >::abs ( ) const

inline

Get the absolute value.

Returns: The absolute value of this fraction number.

◆ max()

template<typename FLOAT_T , const size_t PREC = 6, typename std::enable_if< std::is_floating_point< FLOAT_T >::value, int >::type = 0>

FloatingPoint ts::FloatingPoint< FLOAT_T, PREC, type >::max ( const FloatingPoint< FLOAT_T, PREC, type > & x ) const

inline

Get the maximum value of two fractions.

Parameters

[in] x Another fraction.

Returns: The maximum value of this fraction and x.

◆ min()

template<typename FLOAT_T , const size_t PREC = 6, typename std::enable_if< std::is_floating_point< FLOAT_T >::value, int >::type = 0>

FloatingPoint ts::FloatingPoint< FLOAT_T, PREC, type >::min ( const FloatingPoint< FLOAT_T, PREC, type > & x ) const

inline

Get the minimum value of two fractions.

Parameters

[in] x Another fraction.

Returns: The minimum value of this fraction and x.

◆ mulOverflow() [1/2]

template<typename FLOAT_T , const size_t PREC = 6, typename std::enable_if< std::is_floating_point< FLOAT_T >::value, int >::type = 0>

template<typename INT2 , typename std::enable_if< std::is_integral< INT2 >::value, int >::type = 0>

bool ts::FloatingPoint< FLOAT_T, PREC, type >::mulOverflow ( INT2 x ) const

inline

Check if this FloatingPoint number generates an overflow when multiplied by an integer.

The method is present for compliance with other AbstractNumber subclasses.

Template Parameters

INT2	Another integer type.

Parameters

[in] x An integer of type INT2.

Returns: Always false. A better idea?

◆ mulOverflow() [2/2]

template<typename FLOAT_T , const size_t PREC = 6, typename std::enable_if< std::is_floating_point< FLOAT_T >::value, int >::type = 0>

bool ts::FloatingPoint< FLOAT_T, PREC, type >::mulOverflow ( const FloatingPoint< FLOAT_T, PREC, type > & x ) const

inline

Check if this FloatingPoint number generates an overflow when multiplied by another FloatingPoint.

The method is present for compliance with other AbstractNumber subclasses.

Parameters

[in] x Another FloatingPoint number.

Returns: Always false. A better idea?

◆ divOverflow()

template<typename FLOAT_T , const size_t PREC = 6, typename std::enable_if< std::is_floating_point< FLOAT_T >::value, int >::type = 0>

bool ts::FloatingPoint< FLOAT_T, PREC, type >::divOverflow ( const FloatingPoint< FLOAT_T, PREC, type > & x ) const

inline

Check if this FloatingPoint number generates an overflow when divided by another FloatingPoint.

The method is present for compliance with other AbstractNumber subclasses.

Parameters

[in] x Another FloatingPoint.

Returns: Always false. There is no possible division overflow with FloatingPoint.

◆ Format()

static void ts::AbstractNumber::Format	(	UString &	str,
		size_t	min_width,
		bool	right_justified,
		UChar	separator,
		bool	add_plus_sign,
		size_t	decimals,
		bool	force_decimals,
		UChar	decimal_dot,
		UChar	pad
	)

staticprotectedinherited

Static common utility to format a string containing a number with or without decimal part.

Parameters

[in,out]	str	String to format.
[in]	min_width	Minimum width of the string.
[in]	right_justified	If true (the default), return a right-justified string.
[in]	separator	Separator character for groups of thousands.
[in]	add_plus_sign	If true, force a '+' sign before the number.
[in]	decimals	Precision to use after the decimal point. NPOS not allowed.
[in]	force_decimals	If true, force a decimal dot and the number of decimal digits. For integer types, use force_decimals == true and decimals == 0.
[in]	decimal_dot	The decimal separator.
[in]	pad	The padding character to adjust the width.

◆ Deformat()

static void ts::AbstractNumber::Deformat	(	UString &	str,
		UChar	separator,
		UChar	decimal_dot
	)

staticprotectedinherited

Static common utility to deformat a string containing a number.

Parameters

[in,out]	str	String to deformat.
[in]	separator	Separator character for groups of thousands.
[in]	decimal_dot	The decimal separator.

Member Data Documentation

◆ DISPLAY_PRECISION

template<typename FLOAT_T , const size_t PREC = 6, typename std::enable_if< std::is_floating_point< FLOAT_T >::value, int >::type = 0>

constexpr size_t ts::FloatingPoint< FLOAT_T, PREC, type >::DISPLAY_PRECISION = PREC

staticconstexpr

The displayed precision of the floating-point type (number of decimal digits).

This is a display attribute only, it does not alter the binary representation of floating-point values.

◆ EQUAL_PRECISION

template<typename FLOAT_T , const size_t PREC = 6, typename std::enable_if< std::is_floating_point< FLOAT_T >::value, int >::type = 0>

constexpr float_t ts::FloatingPoint< FLOAT_T, PREC, type >::EQUAL_PRECISION = 100.0 * std::numeric_limits<float_t>::min()

staticconstexpr

Precision of "equal" comparisons.

We cannot test equality between floating point values. Because of rounding issues, it does not make sense. Instead we check if the absolute value of their difference is lower than some very small value, this precision.

◆ INVALID

const AbstractNumber* const ts::AbstractNumber::INVALID

staticinherited

Pointer to an invalid instance of AbstractNumber.

Its toString() method always return an empty string.

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

tsFloatingPoint.h

Public Types

Public Member Functions

Static Public Attributes

Static Protected Member Functions

Detailed Description

Member Typedef Documentation

◆ int_t

Constructor & Destructor Documentation

◆ FloatingPoint()

Member Function Documentation

◆ description()

◆ inRange()

◆ toInt64()

◆ toDouble()

◆ fromString()

◆ toString()

◆ toInt()

◆ abs()

◆ max()

◆ min()

◆ mulOverflow() [1/2]

◆ mulOverflow() [2/2]

◆ divOverflow()

◆ Format()

◆ Deformat()

Member Data Documentation

◆ DISPLAY_PRECISION

◆ EQUAL_PRECISION

◆ INVALID