frontOrThrow

Same as frontOr except it throws an error if it can't get the value

auto frontOrThrow(T value)
auto
frontOrThrow
(
alias makeThrowable
T
)
(
auto ref T value
)
auto frontOrThrow(T value, U throwable)

Parameters

value T: the value to resolve
makeThrowable: the predicate that creates exception value cannot be resolved

Return Value

Type: auto

Nullable!T: value.get or throw

Optional!T: value.front or throw

Range!T: value.front or throw

Examples

import std.exception: assertThrown, assertNotThrown;

""
    .frontOrThrow(new Exception(""))
    .assertThrown!Exception;

auto b = "yo"
    .frontOrThrow(new Exception(""))
    .assertNotThrown!Exception;

assert(b == 'y');

Meta

Source

See Implementation

optional or classes

FrontOrThrowException

functions