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Function std.algorithm.comparison.among
Find value
among values
, returning the 1-based index
of the first matching value in values
, or 0
if value
is not among values
. The predicate pred
is used to
compare values, and uses equality by default.
uint among(alias pred, Value, Values...)
(
Value value,
Values values
)
if (Values .length != 0);
template among(values...)
;
Function among
Template among
Contained Functions
Name | Description |
---|---|
among |
Parameters
Name | Description |
---|---|
pred | The predicate used to compare the values. |
value | The value to search for. |
values | The values to compare the value to. |
Returns
0 if value was not found among the values, otherwise the index of the found value plus one is returned.
See Also
Example
assert(3 .among(1, 42, 24, 3, 2));
if (auto pos = "bar" .among("foo", "bar", "baz"))
writeln(pos); // 2
else
assert(false);
// 42 is larger than 24
writeln(42 .among!((lhs, rhs) => lhs > rhs)(43, 24, 100)); // 2
Example
Alternatively, values
can be passed at compile-time, allowing for a more
efficient search, but one that only supports matching on equality:
assert(3 .among!(2, 3, 4));
writeln("bar" .among!("foo", "bar", "baz")); // 2
Authors
License
Copyright © 1999-2022 by the D Language Foundation | Page generated by ddox.