toOptional

Converts a range or Nullable to an optional type

auto toOptional(R range)
auto toOptional(Nullable!T nullable)
auto
toOptional
(
T
)
(
auto inout ref Nullable!T nullable
)

Parameters

nullable Nullable!T: the Nullable to convert

Return Value

Type: auto

an optional of the element of range or Nullable

Examples

import std.algorithm: map;
import optional;

assert(no!int.map!"a".toOptional == none);
assert(some(1).map!"a".toOptional == some(1));

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none