std.typecons.Nullable.opAssign - multiple declarations
Function Nullable.opAssign
Assigns value to the internally-held state. If the assignment
succeeds, this becomes non-null.
void opAssign
(
T value
);
Parameters
| Name | Description |
|---|---|
| value | A value of type T to assign to this Nullable. |
Function Nullable.opAssign
If value is null, sets this to null, otherwise assigns
value to the internally-held state. If the assignment
succeeds, this becomes non-null.
Parameters
| Name | Description |
|---|---|
| value | A value of type Nullable!T to assign to this Nullable. |
Example
If this Nullable wraps a type that already has a null value
(such as a pointer), then assigning the null value to this
Nullable is no different than assigning any other value of
type T, and the resulting code will look very strange. It
is strongly recommended that this be avoided by instead using
the version of Nullable that takes an additional nullValue
template argument.
//Passes
Nullable!(int*) npi;
assert(npiFunction Nullable.opAssign
Assigns value to the internally-held state. If the assignment
succeeds, this becomes non-null. No null checks are made. Note
that the assignment may leave this in the null state.
void opAssign
(
T value
);
Parameters
| Name | Description |
|---|---|
| value | A value of type T to assign to this Nullable.
If it is nullvalue, then the internal state of
this Nullable will be set to null. |
Example
If this Nullable wraps a type that already has a null value
(such as a pointer), and that null value is not given for
nullValue, then assigning the null value to this Nullable
is no different than assigning any other value of type T,
and the resulting code will look very strange. It is strongly
recommended that this be avoided by using T's "built in"
null value for nullValue.
//Passes
enum nullVal = cast(int*) 0xCAFEBABE;
Nullable!(int*, nullVal) npi;
assert(npiAuthors
Andrei Alexandrescu, Bartosz Milewski, Don Clugston, Shin Fujishiro, Kenji Hara