Description:

Operators available to elements of enumerations if ArithmeticalTraits is specialized.

Note: This namespace exits only in the documentation to collect the operators. When parsed by a C++ compiler, the operators reside in the global namespace.

Function Index:
template<typename TEnum> requires alib::enumops::IsArithmetical<TEnum>
ALIB_EXPORT constexpr TEnum	operator% (TEnum lhs, typename std::underlying_type< TEnum >::type rhs) noexcept

template<typename TEnum> requires alib::enumops::IsArithmetical<TEnum>
ALIB_EXPORT constexpr TEnum	operator%= (TEnum &lhs, typename std::underlying_type< TEnum >::type rhs) noexcept

template<typename TEnum> requires alib::enumops::IsArithmetical<TEnum>
ALIB_EXPORT constexpr TEnum	operator* (TEnum lhs, typename std::underlying_type< TEnum >::type rhs) noexcept

template<typename TEnum> requires alib::enumops::IsArithmetical<TEnum>
ALIB_EXPORT constexpr TEnum	operator*= (TEnum &lhs, typename std::underlying_type< TEnum >::type rhs) noexcept

template<typename TEnum> requires alib::enumops::IsArithmetical<TEnum>
ALIB_EXPORT constexpr TEnum	operator+ (TEnum arg) noexcept

template<typename TEnum> requires alib::enumops::IsArithmetical<TEnum>
ALIB_EXPORT constexpr TEnum	operator+ (TEnum lhs, TEnum rhs) noexcept

template<typename TEnum> requires alib::enumops::IsArithmetical<TEnum>
ALIB_EXPORT constexpr TEnum	operator+ (TEnum lhs, typename std::underlying_type< TEnum >::type rhs) noexcept

template<typename TEnum> requires alib::enumops::IsArithmetical<TEnum>
ALIB_EXPORT constexpr TEnum	operator++ (TEnum &arg) noexcept

template<typename TEnum> requires alib::enumops::IsArithmetical<TEnum>
ALIB_EXPORT constexpr TEnum	operator++ (TEnum &arg, typename std::underlying_type< TEnum >::type) noexcept

template<typename TEnum> requires alib::enumops::IsArithmetical<TEnum>
ALIB_EXPORT constexpr TEnum	operator+= (TEnum &lhs, TEnum rhs) noexcept

template<typename TEnum> requires alib::enumops::IsArithmetical<TEnum>
ALIB_EXPORT constexpr TEnum	operator+= (TEnum &lhs, typename std::underlying_type< TEnum >::type rhs) noexcept

template<typename TEnum> requires alib::enumops::IsArithmetical<TEnum>
ALIB_EXPORT constexpr TEnum	operator- (TEnum arg) noexcept

template<typename TEnum> requires alib::enumops::IsArithmetical<TEnum>
ALIB_EXPORT constexpr TEnum	operator- (TEnum lhs, TEnum rhs) noexcept

template<typename TEnum> requires alib::enumops::IsArithmetical<TEnum>
ALIB_EXPORT constexpr TEnum	operator- (TEnum lhs, typename std::underlying_type< TEnum >::type rhs) noexcept

template<typename TEnum> requires alib::enumops::IsArithmetical<TEnum>
ALIB_EXPORT constexpr TEnum	operator-- (TEnum &arg) noexcept

template<typename TEnum> requires alib::enumops::IsArithmetical<TEnum>
ALIB_EXPORT constexpr TEnum	operator-- (TEnum &arg, typename std::underlying_type< TEnum >::type) noexcept

template<typename TEnum> requires alib::enumops::IsArithmetical<TEnum>
ALIB_EXPORT constexpr TEnum	operator-= (TEnum &lhs, TEnum rhs) noexcept

template<typename TEnum> requires alib::enumops::IsArithmetical<TEnum>
ALIB_EXPORT constexpr TEnum	operator-= (TEnum &lhs, typename std::underlying_type< TEnum >::type rhs) noexcept

template<typename TEnum> requires alib::enumops::IsArithmetical<TEnum>
ALIB_EXPORT constexpr TEnum	operator/ (TEnum lhs, typename std::underlying_type< TEnum >::type rhs) noexcept

template<typename TEnum> requires alib::enumops::IsArithmetical<TEnum>
ALIB_EXPORT constexpr TEnum	operator/= (TEnum &lhs, typename std::underlying_type< TEnum >::type rhs) noexcept

template<typename TEnum> requires alib::enumops::IsArithmetical<TEnum>
ALIB_EXPORT constexpr bool	operator< (TEnum lhs, typename std::underlying_type< TEnum >::type rhs) noexcept

template<typename TEnum> requires alib::enumops::IsArithmetical<TEnum>
ALIB_EXPORT constexpr TEnum	operator<< (TEnum lhs, typename std::underlying_type< TEnum >::type rhs) noexcept

template<typename TEnum> requires alib::enumops::IsArithmetical<TEnum>
ALIB_EXPORT constexpr TEnum	operator<<= (TEnum &lhs, typename std::underlying_type< TEnum >::type rhs) noexcept

template<typename TEnum> requires alib::enumops::IsArithmetical<TEnum>
ALIB_EXPORT constexpr bool	operator<= (TEnum lhs, typename std::underlying_type< TEnum >::type rhs) noexcept

template<typename TEnum> requires alib::enumops::IsArithmetical<TEnum>
ALIB_EXPORT constexpr bool	operator> (TEnum lhs, typename std::underlying_type< TEnum >::type rhs) noexcept

template<typename TEnum> requires alib::enumops::IsArithmetical<TEnum>
ALIB_EXPORT constexpr bool	operator>= (TEnum lhs, typename std::underlying_type< TEnum >::type rhs) noexcept

template<typename TEnum> requires alib::enumops::IsArithmetical<TEnum>
ALIB_EXPORT constexpr TEnum	operator>> (TEnum lhs, typename std::underlying_type< TEnum >::type rhs) noexcept

template<typename TEnum> requires alib::enumops::IsArithmetical<TEnum>
ALIB_EXPORT constexpr TEnum	operator>>= (TEnum &lhs, typename std::underlying_type< TEnum >::type rhs) noexcept

Function Details:

◆ operator%()

template<typename TEnum>
requires alib::enumops::IsArithmetical<TEnum>

ALIB_EXPORT constexpr TEnum alib::enumops::arithmetical::operator%	(	TEnum	lhs,
		typename std::underlying_type< TEnum >::type	rhs )

constexprnoexcept

Modulo operator between an enum element and an integral value of underlying type.

Selected by the compiler only if ArithmeticalTraits is specialized for template enum type TEnum to inherit std::true_type.

Template Parameters

TEnum Enumeration type.

Parameters

lhs	First operand.
rhs	Second operand.

Returns: The resulting enum element.

Definition at line 478 of file arithmetical.inl.

◆ operator%=()

template<typename TEnum>
requires alib::enumops::IsArithmetical<TEnum>

ALIB_EXPORT constexpr TEnum alib::enumops::arithmetical::operator%=	(	TEnum &	lhs,
		typename std::underlying_type< TEnum >::type	rhs )

constexprnoexcept

Modulo assignment operator between an enum element and an integral value of underlying type.

Selected by the compiler only if ArithmeticalTraits is specialized for template enum type TEnum to inherit std::true_type.

Template Parameters

TEnum Enumeration type.

Parameters

[in,out]	lhs	Reference to the first operand. Receives the result.
	rhs	Second operand.

Returns: The resulting enum element.

Definition at line 496 of file arithmetical.inl.

◆ operator*()

template<typename TEnum>
requires alib::enumops::IsArithmetical<TEnum>

ALIB_EXPORT constexpr TEnum alib::enumops::arithmetical::operator*	(	TEnum	lhs,
		typename std::underlying_type< TEnum >::type	rhs )

constexprnoexcept

Multiplication operator between an enum element and an integral value of underlying type.

Selected by the compiler only if ArithmeticalTraits is specialized for template enum type TEnum to inherit std::true_type.

Template Parameters

TEnum Enumeration type.

Parameters

lhs	First operand.
rhs	Second operand.

Returns: The resulting enum element.

Definition at line 407 of file arithmetical.inl.

◆ operator*=()

template<typename TEnum>
requires alib::enumops::IsArithmetical<TEnum>

ALIB_EXPORT constexpr TEnum alib::enumops::arithmetical::operator*=	(	TEnum &	lhs,
		typename std::underlying_type< TEnum >::type	rhs )

constexprnoexcept

Multiplication assignment operator between an enum element and an integral value of underlying type.

Selected by the compiler only if ArithmeticalTraits is specialized for template enum type TEnum to inherit std::true_type.

Template Parameters

TEnum Enumeration type.

Parameters

[in,out]	lhs	Reference to the first operand. Receives the result.
	rhs	Second operand.

Returns: The resulting enum element.

Definition at line 425 of file arithmetical.inl.

◆ operator+() [1/3]

template<typename TEnum>
requires alib::enumops::IsArithmetical<TEnum>

ALIB_EXPORT constexpr TEnum alib::enumops::arithmetical::operator+ ( TEnum arg )

constexprnoexcept

Unary plus operator for enum elements.

Selected by the compiler only if ArithmeticalTraits is specialized for template enum type TEnum to inherit std::true_type.

Template Parameters

TEnum Enumeration type.

Parameters

arg Operand.

Returns: Parameter arg (identical value).

Definition at line 376 of file arithmetical.inl.

◆ operator+() [2/3]

template<typename TEnum>
requires alib::enumops::IsArithmetical<TEnum>

ALIB_EXPORT constexpr TEnum alib::enumops::arithmetical::operator+	(	TEnum	lhs,
		TEnum	rhs )

constexprnoexcept

Add-operator between two enum elements.

Selected by the compiler only if ArithmeticalTraits is specialized for template enum type TEnum to inherit std::true_type.

Template Parameters

TEnum Enumeration type.

Parameters

lhs	First operand.
rhs	Second operand.

Returns: The resulting enum element.

Definition at line 170 of file arithmetical.inl.

◆ operator+() [3/3]

template<typename TEnum>
requires alib::enumops::IsArithmetical<TEnum>

ALIB_EXPORT constexpr TEnum alib::enumops::arithmetical::operator+	(	TEnum	lhs,
		typename std::underlying_type< TEnum >::type	rhs )

constexprnoexcept

Add-operator between an enum element and an integral value of underlying type.

Selected by the compiler only if ArithmeticalTraits is specialized for template enum type TEnum to inherit std::true_type.

Template Parameters

TEnum Enumeration type.

Parameters

lhs	First operand.
rhs	Second operand.

Returns: The resulting enum element.

Definition at line 187 of file arithmetical.inl.

◆ operator++() [1/2]

template<typename TEnum>
requires alib::enumops::IsArithmetical<TEnum>

ALIB_EXPORT constexpr TEnum alib::enumops::arithmetical::operator++ ( TEnum & arg )

constexprnoexcept

Prefix increment operator.

Selected by the compiler only if ArithmeticalTraits is specialized for template enum type TEnum to inherit std::true_type.

Template Parameters

TEnum Enumeration type.

Parameters

[in,out] arg Reference to the enum value to be incremented.

Returns: The new value of lhs which is set to the resulting enum element.

Definition at line 238 of file arithmetical.inl.

◆ operator++() [2/2]

template<typename TEnum>
requires alib::enumops::IsArithmetical<TEnum>

ALIB_EXPORT constexpr TEnum alib::enumops::arithmetical::operator++	(	TEnum &	arg,
		typename std::underlying_type< TEnum >::type	)

constexprnoexcept

Postfix increment operator.

Selected by the compiler only if ArithmeticalTraits is specialized for template enum type TEnum to inherit std::true_type.

Template Parameters

TEnum Enumeration type.

Parameters

[in,out] arg Reference to the enum value to be incremented.

Returns: The old value of arg.

Definition at line 254 of file arithmetical.inl.

◆ operator+=() [1/2]

template<typename TEnum>
requires alib::enumops::IsArithmetical<TEnum>

ALIB_EXPORT constexpr TEnum alib::enumops::arithmetical::operator+=	(	TEnum &	lhs,
		TEnum	rhs )

constexprnoexcept

Add-assignment-operator between two enum elements.

Selected by the compiler only if ArithmeticalTraits is specialized for template enum type TEnum to inherit std::true_type.

Template Parameters

TEnum Enumeration type.

Parameters

lhs	First operand.
rhs	Second operand.

Returns: The new value of lhs which is set to the resulting enum element.

Definition at line 205 of file arithmetical.inl.

◆ operator+=() [2/2]

template<typename TEnum>
requires alib::enumops::IsArithmetical<TEnum>

ALIB_EXPORT constexpr TEnum alib::enumops::arithmetical::operator+=	(	TEnum &	lhs,
		typename std::underlying_type< TEnum >::type	rhs )

constexprnoexcept

Add-assignment-operator between an enum element and an integral value of underlying type.

Selected by the compiler only if ArithmeticalTraits is specialized for template enum type TEnum to inherit std::true_type.

Parameters

[in,out] lhs Reference to the first operand. Receives the result.

Template Parameters

TEnum Enumeration type.

Parameters

rhs	Second operand.

Returns: The new value of lhs which is set to the resulting enum element.

Definition at line 222 of file arithmetical.inl.

◆ operator-() [1/3]

template<typename TEnum>
requires alib::enumops::IsArithmetical<TEnum>

ALIB_EXPORT constexpr TEnum alib::enumops::arithmetical::operator- ( TEnum arg )

constexprnoexcept

Unary minus operator for enum elements.

Selected by the compiler only if ArithmeticalTraits is specialized for template enum type TEnum to inherit std::true_type.

Template Parameters

TEnum Enumeration type.

Parameters

arg Operand.

Returns: The resulting enum element.

Definition at line 389 of file arithmetical.inl.

◆ operator-() [2/3]

template<typename TEnum>
requires alib::enumops::IsArithmetical<TEnum>

ALIB_EXPORT constexpr TEnum alib::enumops::arithmetical::operator-	(	TEnum	lhs,
		TEnum	rhs )

constexprnoexcept

Subtract operator between two enum elements.

Selected by the compiler only if ArithmeticalTraits is specialized for template enum type TEnum to inherit std::true_type.

Template Parameters

TEnum Enumeration type.

Parameters

lhs	First operand.
rhs	Second operand.

Returns: The resulting enum element.

Definition at line 273 of file arithmetical.inl.

◆ operator-() [3/3]

template<typename TEnum>
requires alib::enumops::IsArithmetical<TEnum>

ALIB_EXPORT constexpr TEnum alib::enumops::arithmetical::operator-	(	TEnum	lhs,
		typename std::underlying_type< TEnum >::type	rhs )

constexprnoexcept

Subtract operator between an enum element and an integral value of underlying type.

Selected by the compiler only if ArithmeticalTraits is specialized for template enum type TEnum to inherit std::true_type.

Template Parameters

TEnum Enumeration type.

Parameters

lhs	First operand.
rhs	Second operand.

Returns: The resulting enum element.

Definition at line 291 of file arithmetical.inl.

◆ operator--() [1/2]

template<typename TEnum>
requires alib::enumops::IsArithmetical<TEnum>

ALIB_EXPORT constexpr TEnum alib::enumops::arithmetical::operator-- ( TEnum & arg )

constexprnoexcept

Prefix decrement operator.

Selected by the compiler only if ArithmeticalTraits is specialized for template enum type TEnum to inherit std::true_type.

Template Parameters

TEnum Enumeration type.

Parameters

[in,out] arg Reference to the enum value to be decremented.

Returns: The new value of lhs which is set to the resulting enum element.

Definition at line 341 of file arithmetical.inl.

◆ operator--() [2/2]

template<typename TEnum>
requires alib::enumops::IsArithmetical<TEnum>

ALIB_EXPORT constexpr TEnum alib::enumops::arithmetical::operator--	(	TEnum &	arg,
		typename std::underlying_type< TEnum >::type	)

constexprnoexcept

Postfix decrement operator.

Selected by the compiler only if ArithmeticalTraits is specialized for template enum type TEnum to inherit std::true_type.

Template Parameters

TEnum Enumeration type.

Parameters

[in,out] arg Reference to the enum value to be decremented.

Returns: The old value of arg.

Definition at line 358 of file arithmetical.inl.

◆ operator-=() [1/2]

template<typename TEnum>
requires alib::enumops::IsArithmetical<TEnum>

ALIB_EXPORT constexpr TEnum alib::enumops::arithmetical::operator-=	(	TEnum &	lhs,
		TEnum	rhs )

constexprnoexcept

Subtract assignment operator between two enum elements.

Selected by the compiler only if ArithmeticalTraits is specialized for template enum type TEnum to inherit std::true_type.

Template Parameters

TEnum Enumeration type.

Parameters

lhs	First operand.
rhs	Second operand.

Returns: The new value of lhs which is set to the resulting enum element.

Definition at line 308 of file arithmetical.inl.

◆ operator-=() [2/2]

template<typename TEnum>
requires alib::enumops::IsArithmetical<TEnum>

ALIB_EXPORT constexpr TEnum alib::enumops::arithmetical::operator-=	(	TEnum &	lhs,
		typename std::underlying_type< TEnum >::type	rhs )

constexprnoexcept

Subtract assignment operator between an enum element and an integral value of underlying type.

Selected by the compiler only if ArithmeticalTraits is specialized for template enum type TEnum to inherit std::true_type.

Template Parameters

TEnum Enumeration type.

Parameters

[in,out]	lhs	Reference to the first operand. Receives the result.
	rhs	Second operand.

Returns: The new value of lhs which is set to the resulting enum element.

Definition at line 325 of file arithmetical.inl.

◆ operator/()

template<typename TEnum>
requires alib::enumops::IsArithmetical<TEnum>

ALIB_EXPORT constexpr TEnum alib::enumops::arithmetical::operator/	(	TEnum	lhs,
		typename std::underlying_type< TEnum >::type	rhs )

constexprnoexcept

Division operator between an enum element and an integral value of underlying type.

Selected by the compiler only if ArithmeticalTraits is specialized for template enum type TEnum to inherit std::true_type.

Template Parameters

TEnum Enumeration type.

Parameters

lhs	First operand.
rhs	Second operand.

Returns: The resulting enum element.

Definition at line 442 of file arithmetical.inl.

◆ operator/=()

template<typename TEnum>
requires alib::enumops::IsArithmetical<TEnum>

ALIB_EXPORT constexpr TEnum alib::enumops::arithmetical::operator/=	(	TEnum &	lhs,
		typename std::underlying_type< TEnum >::type	rhs )

constexprnoexcept

Division assignment operator between an enum element and an integral value of underlying type.

Selected by the compiler only if ArithmeticalTraits is specialized for template enum type TEnum to inherit std::true_type.

Template Parameters

TEnum Enumeration type.

Parameters

[in,out]	lhs	Reference to the first operand. Receives the result.
	rhs	Second operand.

Returns: The resulting enum element.

Definition at line 460 of file arithmetical.inl.

◆ operator<()

template<typename TEnum>
requires alib::enumops::IsArithmetical<TEnum>

ALIB_EXPORT constexpr bool alib::enumops::arithmetical::operator<	(	TEnum	lhs,
		typename std::underlying_type< TEnum >::type	rhs )

constexprnoexcept

Comparison operator less between an enum element and an integral value of underlying type.

Selected by the compiler only if ArithmeticalTraits is specialized for template enum type TEnum to inherit std::true_type.

Template Parameters

TEnum Enumeration type.

Parameters

lhs	First operand.
rhs	Second operand.

Returns: The result of the comparison.

Definition at line 98 of file arithmetical.inl.

◆ operator<<()

template<typename TEnum>
requires alib::enumops::IsArithmetical<TEnum>

ALIB_EXPORT constexpr TEnum alib::enumops::arithmetical::operator<<	(	TEnum	lhs,
		typename std::underlying_type< TEnum >::type	rhs )

constexprnoexcept

Shift-left operator between an enum element and an integral value of underlying type.

Selected by the compiler only if ArithmeticalTraits is specialized for template enum type TEnum to inherit std::true_type.

Template Parameters

TEnum Enumeration type.

Parameters

lhs	First operand.
rhs	Second operand.

Returns: The resulting enum element.

Definition at line 514 of file arithmetical.inl.

◆ operator<<=()

template<typename TEnum>
requires alib::enumops::IsArithmetical<TEnum>

ALIB_EXPORT constexpr TEnum alib::enumops::arithmetical::operator<<=	(	TEnum &	lhs,
		typename std::underlying_type< TEnum >::type	rhs )

constexprnoexcept

Shift-left assignment operator between an enum element and an integral value of underlying type.

Selected by the compiler only if ArithmeticalTraits is specialized for template enum type TEnum to inherit std::true_type.

Template Parameters

TEnum Enumeration type.

Parameters

[in,out]	lhs	Reference to the first operand. Receives the result.
	rhs	Second operand.

Returns: The resulting enum element.

Definition at line 531 of file arithmetical.inl.

◆ operator<=()

template<typename TEnum>
requires alib::enumops::IsArithmetical<TEnum>

ALIB_EXPORT constexpr bool alib::enumops::arithmetical::operator<=	(	TEnum	lhs,
		typename std::underlying_type< TEnum >::type	rhs )

constexprnoexcept

Comparison operator less or equal between an enum element and an integral value of the underlying type.

Selected by the compiler only if ArithmeticalTraits is specialized for template enum type TEnum to inherit std::true_type.

Template Parameters

TEnum Enumeration type.

Parameters

lhs	First operand.
rhs	Second operand.

Returns: The result of the comparison.

Definition at line 116 of file arithmetical.inl.

◆ operator>()

template<typename TEnum>
requires alib::enumops::IsArithmetical<TEnum>

ALIB_EXPORT constexpr bool alib::enumops::arithmetical::operator>	(	TEnum	lhs,
		typename std::underlying_type< TEnum >::type	rhs )

constexprnoexcept

Comparison operator greater between an enum element and an integral value of underlying type.

Selected by the compiler only if ArithmeticalTraits is specialized for template enum type TEnum to inherit std::true_type.

Template Parameters

TEnum Enumeration type.

Parameters

lhs	First operand.
rhs	Second operand.

Returns: The result of the comparison.

Definition at line 134 of file arithmetical.inl.

◆ operator>=()

template<typename TEnum>
requires alib::enumops::IsArithmetical<TEnum>

ALIB_EXPORT constexpr bool alib::enumops::arithmetical::operator>=	(	TEnum	lhs,
		typename std::underlying_type< TEnum >::type	rhs )

constexprnoexcept

Comparison operator greater or equal between an enum element and an integral value of the underlying type.

Selected by the compiler only if ArithmeticalTraits is specialized for template enum type TEnum to inherit std::true_type.

Template Parameters

TEnum Enumeration type.

Parameters

lhs	First operand.
rhs	Second operand.

Returns: The result of the comparison.

Definition at line 152 of file arithmetical.inl.

◆ operator>>()

template<typename TEnum>
requires alib::enumops::IsArithmetical<TEnum>

ALIB_EXPORT constexpr TEnum alib::enumops::arithmetical::operator>>	(	TEnum	lhs,
		typename std::underlying_type< TEnum >::type	rhs )

constexprnoexcept

Shift-right operator between an enum element and an integral value of underlying type.

Selected by the compiler only if ArithmeticalTraits is specialized for template enum type TEnum to inherit std::true_type.

Template Parameters

TEnum Enumeration type.

Parameters

lhs	First operand.
rhs	Second operand.

Returns: The resulting enum element.

Definition at line 549 of file arithmetical.inl.

◆ operator>>=()

template<typename TEnum>
requires alib::enumops::IsArithmetical<TEnum>

ALIB_EXPORT constexpr TEnum alib::enumops::arithmetical::operator>>=	(	TEnum &	lhs,
		typename std::underlying_type< TEnum >::type	rhs )

constexprnoexcept

Shift-right assignment operator between an enum element and an integral value of the underlying type.

Selected by the compiler only if ArithmeticalTraits is specialized for template enum type TEnum to inherit std::true_type.

Template Parameters

TEnum Enumeration type.

Parameters

[in,out]	lhs	Reference to the first operand. Receives the result.
	rhs	Second operand.

Returns: The resulting enum element.

Definition at line 567 of file arithmetical.inl.

Description:

Function Index:

Function Details:

◆ operator%()

◆ operator%=()

◆ operator*()

◆ operator*=()

◆ operator+() [1/3]

◆ operator+() [2/3]

◆ operator+() [3/3]

◆ operator++() [1/2]

◆ operator++() [2/2]

◆ operator+=() [1/2]

◆ operator+=() [2/2]

◆ operator-() [1/3]

◆ operator-() [2/3]

◆ operator-() [3/3]

◆ operator--() [1/2]

◆ operator--() [2/2]

◆ operator-=() [1/2]

◆ operator-=() [2/2]

◆ operator/()

◆ operator/=()

◆ operator<()

◆ operator<<()

◆ operator<<=()

◆ operator<=()

◆ operator>()

◆ operator>=()

◆ operator>>()

◆ operator>>=()