Class used via an implicit conversion to enable two objects to be compared with
===
and !==
with a Boolean
result and an enforced type constraint between
two object types.
Class used via an implicit conversion to enable any two objects to be compared with
===
and !==
with a Boolean
result and no enforced type constraint between
two object types.
Class used via an implicit conversion to enable any two objects to be compared with
===
and !==
with an Option[String]
result and an enforced type constraint between
two object types.
Class used via an implicit conversion to enable any two objects to be compared with
===
and !==
with an Option[String]
result and no enforced type constraint between
two object types.
Returns a TripleEqualsInvocationOnSpread[T]
, given an Spread[T]
, to facilitate
the “<left> should !== (<pivot> +- <tolerance>)
”
syntax of Matchers
.
Returns a TripleEqualsInvocationOnSpread[T]
, given an Spread[T]
, to facilitate
the “<left> should !== (<pivot> +- <tolerance>)
”
syntax of Matchers
.
the Spread[T]
against which to compare the left-hand value
a TripleEqualsInvocationOnSpread
wrapping the passed Spread[T]
value, with
expectingEqual
set to false
.
Returns a TripleEqualsInvocation[Null]
, given a null
reference, to facilitate
the “<left> should !== null
” syntax
of Matchers
.
Returns a TripleEqualsInvocation[Null]
, given a null
reference, to facilitate
the “<left> should !== null
” syntax
of Matchers
.
a null reference
a TripleEqualsInvocation
wrapping the passed null
value, with expectingEqual
set to false
.
Returns a TripleEqualsInvocation[T]
, given an object of type T
, to facilitate
the “<left> should !== <right>
” syntax
of Matchers
.
Returns a TripleEqualsInvocation[T]
, given an object of type T
, to facilitate
the “<left> should !== <right>
” syntax
of Matchers
.
the right-hand side value for an equality assertion
a TripleEqualsInvocation
wrapping the passed right value, with expectingEqual
set to false
.
Returns a TripleEqualsInvocationOnSpread[T]
, given an Spread[T]
, to facilitate
the “<left> should === (<pivot> +- <tolerance>)
”
syntax of Matchers
.
Returns a TripleEqualsInvocationOnSpread[T]
, given an Spread[T]
, to facilitate
the “<left> should === (<pivot> +- <tolerance>)
”
syntax of Matchers
.
the Spread[T]
against which to compare the left-hand value
a TripleEqualsInvocationOnSpread
wrapping the passed Spread[T]
value, with
expectingEqual
set to true
.
Returns a TripleEqualsInvocation[Null]
, given a null
reference, to facilitate
the “<left> should === null
” syntax
of Matchers
.
Returns a TripleEqualsInvocation[Null]
, given a null
reference, to facilitate
the “<left> should === null
” syntax
of Matchers
.
a null reference
a TripleEqualsInvocation
wrapping the passed null
value, with expectingEqual
set to true
.
Returns a TripleEqualsInvocation[T]
, given an object of type T
, to facilitate
the “<left> should === <right>
” syntax
of Matchers
.
Returns a TripleEqualsInvocation[T]
, given an object of type T
, to facilitate
the “<left> should === <right>
” syntax
of Matchers
.
the right-hand side value for an equality assertion
a TripleEqualsInvocation
wrapping the passed right value, with expectingEqual
set to true
.
Provides a Constraint[A, B]
class for any two types A
and B
, enforcing the type constraint that B
is
implicitly convertible to A
, given an implicit Equivalence[A]
.
Provides a Constraint[A, B]
class for any two types A
and B
, enforcing the type constraint that B
is
implicitly convertible to A
, given an implicit Equivalence[A]
.
The returned Constraint
's areEqual
method uses the implicitly passed Equivalence[A]
's
areEquivalent
method to determine equality.
This method is overridden and made implicit by subtraits
ConversionCheckedTripleEquals
) and
ConversionCheckedLegacyTripleEquals
, and
overriden as non-implicit by the other subtraits in this package.
an Equivalence[A]
type class to which the Constraint.areEqual
method will delegate to determine equality.
an implicit conversion from B
to A
a Constraint[A, B]
whose areEqual
method delegates to the areEquivalent
method of
the passed Equivalence[A]
.
Provides a Constraint[A, B]
for any two types A
and B
, enforcing the type constraint
that A
must be a subtype of B
, given an explicit Equivalence[B]
.
Provides a Constraint[A, B]
for any two types A
and B
, enforcing the type constraint
that A
must be a subtype of B
, given an explicit Equivalence[B]
.
This method is used to enable the Explicitly
DSL for
TypeCheckedTripleEquals
by requiring an explicit Equivalance[B]
, but
taking an implicit function that provides evidence that A
is a subtype of B.
The returned Constraint
's areEqual
method uses the implicitly passed Equivalence[B]
's
areEquivalent
method to determine equality.
This method is overridden and made implicit by subtraits
LowPriorityTypeCheckedConstraint
(extended by
TypeCheckedTripleEquals
), and
LowPriorityTypeCheckedLegacyConstraint
(extended by
TypeCheckedLegacyTripleEquals
), and
overriden as non-implicit by the other subtraits in this package.
an Equivalence[B]
type class to which the Constraint.areEqual
method
will delegate to determine equality.
evidence that A
is a subype of B
a Constraint[A, B]
whose areEqual
method delegates to the
areEquivalent
method of the passed Equivalence[B]
.
Provides a Constraint[A, B]
class for any two types A
and B
, enforcing the type constraint that A
is
implicitly convertible to B
, given an explicit Equivalence[B]
.
Provides a Constraint[A, B]
class for any two types A
and B
, enforcing the type constraint that A
is
implicitly convertible to B
, given an explicit Equivalence[B]
.
This method is used to enable the Explicitly
DSL for
ConversionCheckedTripleEquals
by requiring an explicit Equivalance[B]
, but
taking an implicit function that converts from A
to B.
The returned Constraint
's areEqual
method uses the implicitly passed Equivalence[B]
's
areEquivalent
method to determine equality.
This method is overridden and made implicit by subtraits
LowPriorityConversionCheckedConstraint
(extended by
ConversionCheckedTripleEquals
), and
LowPriorityConversionCheckedLegacyConstraint
(extended by
ConversionCheckedLegacyTripleEquals
), and
overriden as non-implicit by the other subtraits in this package.
a Constraint[A, B]
whose areEqual
method delegates to the areEquivalent
method of
the passed Equivalence[B]
.
Provides a Constraint[A, B]
for any two types A
and B
, enforcing the type constraint
that B
must be a subtype of A
, given an explicit Equivalence[A]
.
Provides a Constraint[A, B]
for any two types A
and B
, enforcing the type constraint
that B
must be a subtype of A
, given an explicit Equivalence[A]
.
This method is used to enable the Explicitly
DSL for
TypeCheckedTripleEquals
by requiring an explicit Equivalance[B]
, but
taking an implicit function that provides evidence that A
is a subtype of B. For example, under TypeCheckedTripleEquals
,
this method (as an implicit method), would be used to compile this statement:
def closeEnoughTo1(num: Double): Boolean = (num === 1.0)(decided by forgivingEquality)
The returned Constraint
's areEqual
method uses the implicitly passed Equivalence[A]
's
areEquivalent
method to determine equality.
This method is overridden and made implicit by subtraits
TypeCheckedTripleEquals
) and
TypeCheckedLegacyTripleEquals
, and
overriden as non-implicit by the other subtraits in this package.
evidence that B
is a subype of A
a Constraint[A, B]
whose areEqual
method delegates to the areEquivalent
method of
the passed Equivalence[A]
.
Provides a Constraint[A, B]
class for any two types A
and B
, enforcing the type constraint that B
is
implicitly convertible to A
, given an explicit Equivalence[A]
.
Provides a Constraint[A, B]
class for any two types A
and B
, enforcing the type constraint that B
is
implicitly convertible to A
, given an explicit Equivalence[A]
.
This method is used to enable the Explicitly
DSL for
ConversionCheckedTripleEquals
by requiring an explicit Equivalance[A]
, but
taking an implicit function that converts from B
to A. For example, under ConversionCheckedTripleEquals
,
this method (as an implicit method), would be used to compile this statement:
def closeEnoughTo1(num: Double): Boolean = (num === 1.0)(decided by forgivingEquality)
The returned Constraint
's areEqual
method uses the implicitly passed Equivalence[A]
's
areEquivalent
method to determine equality.
This method is overridden and made implicit by subtraits
ConversionCheckedTripleEquals
) and
ConversionCheckedLegacyTripleEquals
, and
overriden as non-implicit by the other subtraits in this package.
an Equivalence[A]
type class to which the Constraint.areEqual
method will delegate to determine equality.
a Constraint[A, B]
whose areEqual
method delegates to the areEquivalent
method of
the passed Equivalence[A]
.
Converts to an CheckingEqualizer
that provides ===
and !==
operators
that result in Boolean
and enforce a type constraint.
Converts to an CheckingEqualizer
that provides ===
and !==
operators
that result in Boolean
and enforce a type constraint.
This method is overridden and made implicit by subtraits TypeCheckedTripleEquals
and
ConversionCheckedTripleEquals
, and overriden as
non-implicit by the other subtraits in this package.
the object whose type to convert to CheckingEqualizer
.
if left
is null
.
Converts to an Equalizer
that provides ===
and !==
operators that
result in Boolean
and enforce no type constraint.
Converts to an Equalizer
that provides ===
and !==
operators that
result in Boolean
and enforce no type constraint.
This method is overridden and made implicit by subtrait TripleEquals
and overriden as non-implicit by the other
subtraits in this package.
the object whose type to convert to Equalizer
.
if left
is null
.
Converts to a LegacyCheckingEqualizer
that provides ===
and !==
operators
that result in Option[String]
and enforce a type constraint.
Converts to a LegacyCheckingEqualizer
that provides ===
and !==
operators
that result in Option[String]
and enforce a type constraint.
This method is overridden and made implicit by subtraits TypeCheckedLegacyTripleEquals
and ConversionCheckedLegacyTripleEquals
, and
overriden as non-implicit by the other subtraits in this package.
the object whose type to convert to LegacyCheckingEqualizer
.
if left
is null
.
Converts to a LegacyEqualizer
that provides ===
and !==
operators that
result in Option[String]
and enforce no type constraint.
Converts to a LegacyEqualizer
that provides ===
and !==
operators that
result in Option[String]
and enforce no type constraint.
This method is overridden and made implicit by subtrait LegacyTripleEquals
and overriden as non-implicit
by the other subtraits in this package.
the object whose type to convert to LegacyEqualizer
.
if left
is null
.
Returns an Equality[A]
for any type A
that determines equality
by first calling .deep
on any Array
(on either the left or right side),
then comparing the resulting objects with ==
.
Returns an Equality[A]
for any type A
that determines equality
by first calling .deep
on any Array
(on either the left or right side),
then comparing the resulting objects with ==
.
a default Equality
for type A
Provides a Constraint[A, B]
class for any two types A
and B
, enforcing the type constraint that A
is
implicitly convertible to B
, given an implicit Equivalence[B]
.
Provides a Constraint[A, B]
class for any two types A
and B
, enforcing the type constraint that A
is
implicitly convertible to B
, given an implicit Equivalence[B]
.
The returned Constraint
's areEqual
method uses the implicitly passed Equivalence[B]
's
areEquivalent
method to determine equality.
This method is overridden and made implicit by subtraits
LowPriorityConversionCheckedConstraint
(extended by
ConversionCheckedTripleEquals
), and
LowPriorityConversionCheckedLegacyConstraint
(extended by
ConversionCheckedLegacyTripleEquals
), and
overriden as non-implicit by the other subtraits in this package.
an implicit conversion from A
to B
a Constraint[A, B]
whose areEqual
method delegates to the areEquivalent
method of
the passed Equivalence[B]
.
Provides a Constraint[A, B]
for any two types A
and B
, enforcing the type constraint
that A
must be a subtype of B
, given an implicit Equivalence[B]
.
Provides a Constraint[A, B]
for any two types A
and B
, enforcing the type constraint
that A
must be a subtype of B
, given an implicit Equivalence[B]
.
The returned Constraint
's areEqual
method uses the implicitly passed Equivalence[A]
's
areEquivalent
method to determine equality.
This method is overridden and made implicit by subtraits
LowPriorityTypeCheckedConstraint
(extended by
TypeCheckedTripleEquals
), and
LowPriorityTypeCheckedLegacyConstraint
(extended by
TypeCheckedLegacyTripleEquals
), and
overriden as non-implicit by the other subtraits in this package.
an Equivalence[B]
type class to which the Constraint.areEqual
method
will delegate to determine equality.
evidence that A
is a subype of B
a Constraint[A, B]
whose areEqual
method delegates to the
areEquivalent
method of the passed Equivalence[B]
.
Provides a Constraint[A, B]
for any two types A
and B
, enforcing the type constraint
that B
must be a subtype of A
, given an implicit Equivalence[A]
.
Provides a Constraint[A, B]
for any two types A
and B
, enforcing the type constraint
that B
must be a subtype of A
, given an implicit Equivalence[A]
.
The returned Constraint
's areEqual
method uses the implicitly passed Equivalence[A]
's
areEquivalent
method to determine equality.
This method is overridden and made implicit by subtraits
TypeCheckedTripleEquals
) and
TypeCheckedLegacyTripleEquals
, and
overriden as non-implicit by the other subtraits in this package.
evidence that B
is a subype of A
a Constraint[A, B]
whose areEqual
method delegates to the areEquivalent
method of
the passed Equivalence[A]
.
Provides a Constraint[A, B]
class for any two types A
and B
, with no type constraint enforced, given an
implicit Equality[A]
.
Provides a Constraint[A, B]
class for any two types A
and B
, with no type constraint enforced, given an
implicit Equality[A]
.
The returned Constraint
's areEqual
method uses the implicitly passed Equality[A]
's
areEqual
method to determine equality.
This method is overridden and made implicit by subtraits TripleEquals
and
LegacyTripleEquals
, and
overriden as non-implicit by the other subtraits in this package.
an Equality[A]
type class to which the Constraint.areEqual
method will delegate to determine equality.
a Constraint[A, B]
whose areEqual
method delegates to the areEqual
method of
the passed Equality[A]
.
Provides
===
and!==
operators that returnBoolean
, delegate the equality determination to anEquality
type class, and require no relationship between the types of the two values compared.TripleEquals
is useful (in both production and test code) when you need determine equality for a type of object differently than itsequals
method: either you can't change theequals
method, or theequals
method is sensible generally, but you are in a special situation where you need something else. If you also want a compile-time type check, however, you should use one ofTripleEquals
sibling traits:ConversionCheckedTripleEquals
orTypeCheckedTripleEquals
.This trait will override or hide implicit methods defined by its sibling traits,
ConversionCheckedTripleEquals
orTypeCheckedTripleEquals
, and can therefore be used to temporarily turn of type checking in a limited scope. Here's an example, in whichTypeCheckedTripleEquals
will cause a compiler error:Because
Int
andLong
are not in a subtype/supertype relationship, comparing1
and1L
in the context ofTypeCheckedTripleEquals
will generate a compiler error:You can “turn off” the type checking locally by importing the members of
TripleEquals
in a limited scope:With the above change, the
Example.scala
file compiles fine. Type checking is turned off only inside the firstcmp
method that takes anInt
and aLong
.TypeCheckedTripleEquals
is still enforcing its type constraint, for example, for thes === t
expression in the other overloadedcmp
method that takes strings.Because the methods in
TripleEquals
(and its siblings)override all the methods defined in supertypeTripleEqualsSupport
, you can achieve the same kind of nested tuning of equality constraints whether you mix in traits, import from companion objects, or use some combination of both.In short, you should be able to select a primary constraint level via either a mixin or import, then change that in nested scopes however you want, again either through a mixin or import, without getting any implicit conversion ambiguity. The innermost constraint level in scope will always be in force.