Data structure storing a fee and size, ordered by increasing fee/size. More...

#include <feefrac.h>

Public Member Functions
	FeeFrac () noexcept
	Construct an IsEmpty() FeeFrac. More...

	FeeFrac (int64_t f, int32_t s) noexcept
	Construct a FeeFrac with specified fee and size. More...

	FeeFrac (const FeeFrac &) noexcept=default

FeeFrac &	operator= (const FeeFrac &) noexcept=default

bool	IsEmpty () const noexcept
	Check if this is empty (size and fee are 0). More...

void	operator+= (const FeeFrac &other) noexcept
	Add fee and size of another FeeFrac to this one. More...

void	operator-= (const FeeFrac &other) noexcept
	Subtract fee and size of another FeeFrac from this one. More...

Static Public Member Functions
static std::pair< int64_t, uint32_t >	MulFallback (int64_t a, int32_t b) noexcept
	Fallback version for Mul (see below). More...

Public Attributes
int64_t	fee

int32_t	size

Static Public Attributes
static constexpr auto	Mul = MulFallback

Friends
FeeFrac	operator+ (const FeeFrac &a, const FeeFrac &b) noexcept
	Sum fee and size. More...

FeeFrac	operator- (const FeeFrac &a, const FeeFrac &b) noexcept
	Subtract both fee and size. More...

bool	operator== (const FeeFrac &a, const FeeFrac &b) noexcept
	Check if two FeeFrac objects are equal (both same fee and same size). More...

std::weak_ordering	FeeRateCompare (const FeeFrac &a, const FeeFrac &b) noexcept
	Compare two FeeFracs just by feerate. More...

bool	operator<< (const FeeFrac &a, const FeeFrac &b) noexcept
	Check if a FeeFrac object has strictly lower feerate than another. More...

bool	operator>> (const FeeFrac &a, const FeeFrac &b) noexcept
	Check if a FeeFrac object has strictly higher feerate than another. More...

std::strong_ordering	operator<=> (const FeeFrac &a, const FeeFrac &b) noexcept
	Compare two FeeFracs. More...

void	swap (FeeFrac &a, FeeFrac &b) noexcept
	Swap two FeeFracs. More...

Detailed Description

Data structure storing a fee and size, ordered by increasing fee/size.

The size of a FeeFrac cannot be zero unless the fee is also zero.

FeeFracs have a total ordering, first by increasing feerate (ratio of fee over size), and then by decreasing size. The empty FeeFrac (fee and size both 0) sorts last. So for example, the following FeeFracs are in sorted order:

fee=0 size=1 (feerate 0)
fee=1 size=2 (feerate 0.5)
fee=2 size=3 (feerate 0.667...)
fee=2 size=2 (feerate 1)
fee=1 size=1 (feerate 1)
fee=3 size=2 (feerate 1.5)
fee=2 size=1 (feerate 2)
fee=0 size=0 (undefined feerate)

A FeeFrac is considered "better" if it sorts after another, by this ordering. All standard comparison operators (<=>, ==, !=, >, <, >=, <=) respect this ordering.

The FeeRateCompare, and >> and << operators only compare feerate and treat equal feerate but different size as equivalent. The empty FeeFrac is neither lower or higher in feerate than any other.

Definition at line 38 of file feefrac.h.

Constructor & Destructor Documentation

◆ FeeFrac() [1/3]

FeeFrac::FeeFrac ( )

inlinenoexcept

Construct an IsEmpty() FeeFrac.

Definition at line 67 of file feefrac.h.

◆ FeeFrac() [2/3]

FeeFrac::FeeFrac	(	int64_t	f,
		int32_t	s
	)

inlinenoexcept

Construct a FeeFrac with specified fee and size.

Definition at line 70 of file feefrac.h.

◆ FeeFrac() [3/3]

FeeFrac::FeeFrac ( const FeeFrac & )

inlinedefaultnoexcept

Member Function Documentation

◆ IsEmpty()

bool FeeFrac::IsEmpty ( ) const

inlinenoexcept

Check if this is empty (size and fee are 0).

Definition at line 76 of file feefrac.h.

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◆ MulFallback()

static std::pair<int64_t, uint32_t> FeeFrac::MulFallback	(	int64_t	a,
		int32_t	b
	)

inlinestaticnoexcept

Fallback version for Mul (see below).

Separate to permit testing on platforms where it isn't actually needed.

Definition at line 44 of file feefrac.h.

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◆ operator+=()

void FeeFrac::operator+= ( const FeeFrac & other )

inlinenoexcept

Add fee and size of another FeeFrac to this one.

Definition at line 81 of file feefrac.h.

◆ operator-=()

void FeeFrac::operator-= ( const FeeFrac & other )

inlinenoexcept

Subtract fee and size of another FeeFrac from this one.

Definition at line 88 of file feefrac.h.

◆ operator=()

FeeFrac& FeeFrac::operator= ( const FeeFrac & )

inlinedefaultnoexcept

Friends And Related Function Documentation

◆ FeeRateCompare

std::weak_ordering FeeRateCompare	(	const FeeFrac &	a,
		const FeeFrac &	b
	)

friend

Compare two FeeFracs just by feerate.

Definition at line 113 of file feefrac.h.

◆ operator+

FeeFrac operator+	(	const FeeFrac &	a,
		const FeeFrac &	b
	)

friend

Sum fee and size.

Definition at line 95 of file feefrac.h.

◆ operator-

FeeFrac operator-	(	const FeeFrac &	a,
		const FeeFrac &	b
	)

friend

Subtract both fee and size.

Definition at line 101 of file feefrac.h.

◆ operator<<

bool operator<<	(	const FeeFrac &	a,
		const FeeFrac &	b
	)

friend

Check if a FeeFrac object has strictly lower feerate than another.

Definition at line 120 of file feefrac.h.

◆ operator<=>

std::strong_ordering operator<=>	(	const FeeFrac &	a,
		const FeeFrac &	b
	)

friend

Compare two FeeFracs.

<, >, <=, and >= are auto-generated from this.

Definition at line 134 of file feefrac.h.

◆ operator==

bool operator==	(	const FeeFrac &	a,
		const FeeFrac &	b
	)

friend

Check if two FeeFrac objects are equal (both same fee and same size).

Definition at line 107 of file feefrac.h.

◆ operator>>

bool operator>>	(	const FeeFrac &	a,
		const FeeFrac &	b
	)

friend

Check if a FeeFrac object has strictly higher feerate than another.

Definition at line 127 of file feefrac.h.

◆ swap

void swap	(	FeeFrac &	a,
		FeeFrac &	b
	)

friend

Swap two FeeFracs.

Definition at line 142 of file feefrac.h.

Member Data Documentation

◆ fee

int64_t FeeFrac::fee

Definition at line 63 of file feefrac.h.

◆ Mul

constexpr auto FeeFrac::Mul = MulFallback

staticconstexpr

Definition at line 60 of file feefrac.h.

◆ size

int32_t FeeFrac::size

Definition at line 64 of file feefrac.h.

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

src/util/feefrac.h

Public Member Functions

Static Public Member Functions

Public Attributes

Static Public Attributes

Friends

Detailed Description

Constructor & Destructor Documentation

◆ FeeFrac() [1/3]

◆ FeeFrac() [2/3]

◆ FeeFrac() [3/3]

Member Function Documentation

◆ IsEmpty()

◆ MulFallback()

◆ operator+=()

◆ operator-=()

◆ operator=()

Friends And Related Function Documentation

◆ FeeRateCompare

◆ operator+

◆ operator-

◆ operator<<

◆ operator<=>

◆ operator==

◆ operator>>

◆ swap

Member Data Documentation

◆ fee

◆ Mul

◆ size