Test two objects for inequality.
Test two objects for inequality.
true
if !(this == that), false otherwise.
Equivalent to x.hashCode
except for boxed numeric types and null
.
Equivalent to x.hashCode
except for boxed numeric types and null
.
For numerics, it returns a hash value which is consistent
with value equality: if two value type instances compare
as true, then ## will produce the same hash value for each
of them.
For null
returns a hashcode where null.hashCode
throws a
NullPointerException
.
a hash value consistent with ==
The expression x == that
is equivalent to if (x eq null) that eq null else x.equals(that)
.
The expression x == that
is equivalent to if (x eq null) that eq null else x.equals(that)
.
true
if the receiver object is equivalent to the argument; false
otherwise.
Cast the receiver object to be of type T0
.
Cast the receiver object to be of type T0
.
Note that the success of a cast at runtime is modulo Scala's erasure semantics.
Therefore the expression 1.asInstanceOf[String]
will throw a ClassCastException
at
runtime, while the expression List(1).asInstanceOf[List[String]]
will not.
In the latter example, because the type argument is erased as part of compilation it is
not possible to check whether the contents of the list are of the requested type.
the receiver object.
ClassCastException
if the receiver object is not an instance of the erasure of type T0
.
Methods in scala.runtime.BoxesRuntime
Maps the method symbol for a box method to the boxed type of the result.
Maps the method symbol for a box method to the boxed type of the result. For example, the
method symbol for Byte.box()
is mapped to the ClassBType java/lang/Byte
.
Map from primitive types to their boxed class type.
Map from primitive types to their boxed class type. Useful when pushing class literals onto the operand stack (ldc instruction taking a class literal), see genConstant.
Create a copy of the receiver object.
Create a copy of the receiver object.
The default implementation of the clone
method is platform dependent.
a copy of the receiver object.
not specified by SLS as a member of AnyRef
Tests whether the argument (that
) is a reference to the receiver object (this
).
Tests whether the argument (that
) is a reference to the receiver object (this
).
The eq
method implements an equivalence relation on
non-null instances of AnyRef
, and has three additional properties:
x
and y
of type AnyRef
, multiple invocations of
x.eq(y)
consistently returns true
or consistently returns false
.x
of type AnyRef
, x.eq(null)
and null.eq(x)
returns false
.null.eq(null)
returns true
. When overriding the equals
or hashCode
methods, it is important to ensure that their behavior is
consistent with reference equality. Therefore, if two objects are references to each other (o1 eq o2
), they
should be equal to each other (o1 == o2
) and they should hash to the same value (o1.hashCode == o2.hashCode
).
true
if the argument is a reference to the receiver object; false
otherwise.
The equality method for reference types.
Called by the garbage collector on the receiver object when there are no more references to the object.
Called by the garbage collector on the receiver object when there are no more references to the object.
The details of when and if the finalize
method is invoked, as
well as the interaction between finalize
and non-local returns
and exceptions, are all platform dependent.
not specified by SLS as a member of AnyRef
A representation that corresponds to the dynamic class of the receiver object.
A representation that corresponds to the dynamic class of the receiver object.
The nature of the representation is platform dependent.
a representation that corresponds to the dynamic class of the receiver object.
not specified by SLS as a member of AnyRef
The hashCode method for reference types.
Test whether the dynamic type of the receiver object is T0
.
Test whether the dynamic type of the receiver object is T0
.
Note that the result of the test is modulo Scala's erasure semantics.
Therefore the expression 1.isInstanceOf[String]
will return false
, while the
expression List(1).isInstanceOf[List[String]]
will return true
.
In the latter example, because the type argument is erased as part of compilation it is
not possible to check whether the contents of the list are of the specified type.
true
if the receiver object is an instance of erasure of type T0
; false
otherwise.
Equivalent to !(this eq that)
.
Equivalent to !(this eq that)
.
true
if the argument is not a reference to the receiver object; false
otherwise.
Wakes up a single thread that is waiting on the receiver object's monitor.
Wakes up a single thread that is waiting on the receiver object's monitor.
not specified by SLS as a member of AnyRef
Wakes up all threads that are waiting on the receiver object's monitor.
Wakes up all threads that are waiting on the receiver object's monitor.
not specified by SLS as a member of AnyRef
Maps primitive types to their corresponding PrimitiveBType.
Maps primitive types to their corresponding PrimitiveBType. The map is defined lexically above
the first use of classBTypeFromSymbol
because that method looks at the map.
Creates a String representation of this object.
Creates a String representation of this object. The default representation is platform dependent. On the java platform it is the concatenation of the class name, "@", and the object's hashcode in hexadecimal.
a String representation of the object.
Maps the method symbol for an unbox method to the primitive type of the result.
Maps the method symbol for an unbox method to the primitive type of the result.
For example, the method symbol for Byte.unbox()
) is mapped to the PrimitiveBType BYTE.
Core BTypes and some other definitions. The initialization of these definitions requires access to symbols / types (global).
The symbols used to initialize the ClassBTypes may change from one compiler run to the next. To make sure the definitions are consistent with the symbols in the current run, the
intializeCoreBTypes
method in BTypesFromSymbols creates a new instance of CoreBTypes in each compiler run.The class BTypesFromSymbols does not directly reference CoreBTypes, but CoreBTypesProxy. The reason is that having a
var bTypes: CoreBTypes
would not allowimport bTypes._
. Instead, the proxy class holds aCoreBTypes
in a variable field and forwards to this instance.The definitions in
CoreBTypes
need to be lazy vals to break an initialization cycle. When creating a new instance to assign to the proxy, theclassBTypeFromSymbol
invoked in the constructor will actually go through the proxy. The lazy vals make sure the instance is assigned in the proxy before the fields are initialized.Note: if we did not re-create the core BTypes on each compiler run, BType.classBTypeFromInternalNameMap could not be a perRunCache anymore: the classes defined here need to be in that map, they are added when the ClassBTypes are created. The per run cache removes them, so they would be missing in the second run.