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Showing content from https://scala-lang.org/api/3.x/scala/$eq$colon$eq$.html below:

=:=

Substitute To for From and From for To in the type F[To, From], given that F is a type constructor of two arguments.

Substitute To for From and From for To in the type F[To, From], given that F is a type constructor of two arguments. Essentially swaps To and From in ftf's type.

Equivalent in power to each of substituteCo and substituteContra.

This method is impossible to implement without throwing or otherwise "cheating" unless From = To, so it ensures that this really represents a type equality.

Attributes
Returns

ftf, $sameDiff

Definition Classes
Source
typeConstraints.scala

If From = To and To = C, then From = C (equality is transitive)

Coerce a From into a To.

Coerce a From into a To. This is guaranteed to be the identity function.

This method is often called implicitly as an implicit A =:= B doubles as an implicit view A => B.

Attributes
Definition Classes
Source
typeConstraints.scala

If From = To and C = From, then C = To (equality is transitive)

If From = To then To = From (equality is symmetric)

Lift this evidence over any type constructor F.

Lift this evidence over any type constructor F.

Attributes
Definition Classes
Source
typeConstraints.scala

Lift this evidence over the type constructor F, but flipped.

Lift this evidence over the type constructor F, but flipped.

Attributes
Definition Classes
Source
typeConstraints.scala

Substitute the From in the type F[From], where F is any type constructor, for To.

Substitute the From in the type F[From], where F is any type constructor, for To.

Equivalent in power to each of substituteBoth and substituteContra.

This method is impossible to implement without throwing or otherwise "cheating" unless From = To, so it ensures that this really represents a type equality.

Attributes
Returns

ff, $sameDiff

Definition Classes
Source
typeConstraints.scala

Substitute the To in the type F[To], where F is any type constructor, for From.

Substitute the To in the type F[To], where F is any type constructor, for From.

Equivalent in power to each of substituteBoth and substituteCo.

This method is impossible to implement without throwing or otherwise "cheating" unless From = To, so it ensures that this really represents a type equality.

Attributes
Returns

ft, $sameDiff

Definition Classes
Source
typeConstraints.scala

If From <: To and To <: C, then From <: C (subtyping is transitive)

If From <: To and To <: C, then From <: C (subtyping is transitive)

Attributes
Inherited from:
<:<
Source
typeConstraints.scala

Composes two instances of Function1 in a new Function1, with this function applied first.

Composes two instances of Function1 in a new Function1, with this function applied first.

Type parameters
A

the result type of function g

Value parameters
g

a function R => A

Attributes
Returns

a new function f such that f(x) == g(apply(x))

Definition Classes
Inherited from:
<:<
Source
typeConstraints.scala

If From <: To and C <: From, then C <: To (subtyping is transitive)

If From <: To and C <: From, then C <: To (subtyping is transitive)

Attributes
Inherited from:
<:<
Source
typeConstraints.scala

Composes two instances of Function1 in a new Function1, with this function applied last.

Composes two instances of Function1 in a new Function1, with this function applied last.

Type parameters
A

the type to which function g can be applied

Value parameters
g

a function A => T1

Attributes
Returns

a new function f such that f(x) == apply(g(x))

Definition Classes
Inherited from:
<:<
Source
typeConstraints.scala

Returns a string representation of the object.

Returns a string representation of the object.

The default representation is platform dependent.

Attributes
Returns

a string representation of the object.

Definition Classes
Inherited from:
Function1
Source
Function1.scala

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