Algebraic.get

Gets the value if not null. If this is in the null state, and the optional parameter fallback was provided, it will be returned. Without fallback, calling get with a null state is invalid.

When the fallback type is different from the Nullable type, get(T) returns the common type.

auto get()
inout(AllowedTypes[1]) get()
inout(AllowedTypes[1]) get [@property setter]
struct Algebraic(_Types...)
@property ref return inout
static if(is(AllowedTypes[0] == typeof(null)))
static if(AllowedTypes.length == 2)
inout(AllowedTypes[1])
get
()
(
auto ref inout(AllowedTypes[1]) fallback
)
auto ref get()
template get(RetTypes...)
alias get(Kind kind) = get!(AllowedTypes[kind])
auto ref get()

Parameters

fallback inout(AllowedTypes[1]): the value to return in case the Nullable is null.

Return Value

Type: inout(AllowedTypes[1])

The value held internally by this Nullable.

Examples

enum E { a = "a", b = "b" }
Nullable!E f = E.a;
auto e = f.get();
static assert(is(typeof(e) == E), Nullable!E.AllowedTypes.stringof);
assert(e == E.a);

assert(f.get(E.b) == E.a);

f = null;
assert(f.get(E.b) == E.b);

Algebraic.get

Parameters

Return Value

Examples

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