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];

bool isNull [@property getter];

void opAssign(U value);

int opApply(int delegate(Some!T) dg);

int opApply(int delegate(const(Some!T)) dg);

int opApply(int delegate(immutable(Some!T)) dg);

alias opApplyReverse = opApply;

}

Constructors

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

Members

Aliases

opApplyReverse alias opApplyReverse = opApply: Reverse iteration is exactly the same as forward iteration.

Functions

opApply int opApply(int delegate(const(Some!T)) dg): Permit foreach over an option type.
opApply int opApply(int delegate(Some!T) dg)
int opApply(int delegate(immutable(Some!T)) dg): Permit foreach over an option type.
opAssign void opAssign(U value): Assign another value to this object.

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