Option

This type represents an optional value for T.

This is a means of explicitly dealing with null values in every case.

struct Option (

T

) if (

is(T == class) ||

isPointer!T

) {

this(inout(U) value);

Some!T get [@property getter];

const(Some!T) get [@property getter];

immutable(Some!T) get [@property getter];

inout(Option!U) dynamicCast();

Some!T or(DG dg);

const(Some!T) or(DG dg);

immutable(Some!T) or(DG dg);

bool isNull [@property getter];

void opAssign(U value);

}

Constructors

this this(inout(U) value): Construct this object by wrapping a given value.

Members

Functions

dynamicCast inout(Option!U) dynamicCast(): Given some type U, perform a dynamic cast on the class reference held within this optional value, and return a new optional value which may be null if the cast fails.
opAssign void opAssign(U value): Assign another value to this object.
or Some!T or(DG dg)
immutable(Some!T) or(DG dg)
const(Some!T) or(DG dg): Return some value from this reference, or a default value by calling a callable argument. (function pointer, delegate, etc.)

Properties

get Some!T get [@property getter]
const(Some!T) get [@property getter]
immutable(Some!T) get [@property getter]: Get the value from this object.
isNull bool isNull [@property getter]

Meta

Source

See Implementation

dstruct option functions

structs