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std.typecons.Nullable.get
- multiple declarations
Function Nullable.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.
inout ref inout(T) get() pure nothrow @property @safe;
inout inout(T) get
(
inout(T) fallback
) @property;
inout auto get(U)
(
inout(U) fallback
) @property;
When the fallback type is different from the Nullable type, get(T)
returns
the common type.
Parameters
Name | Description |
---|---|
fallback | the value to return in case the Nullable is null. |
Returns
The value held internally by this Nullable
.
Function Nullable.get
Gets the value. this
must not be in the null state.
This function is also called for the implicit conversion to T
.
inout ref inout(T) get() @property;
Preconditions
isNull
must be false
.
Returns
The value held internally by this Nullable
.
Example
import std .exception : assertThrown, assertNotThrown;
Nullable!(int, -1) ni;
//`get` is implicitly called. Will throw
//an error in non-release mode
assertThrown!Throwable(ni == 0);
ni = 0;
assertNotThrown!Throwable(ni == 0);
Authors
Andrei Alexandrescu, Bartosz Milewski, Don Clugston, Shin Fujishiro, Kenji Hara
License
Copyright © 1999-2022 by the D Language Foundation | Page generated by ddox.