count

Performs a linear scan of haystack from [0 .. haystack.length$(RP), returning a count of the number of elements matching needle. Comparisons will be performed using the supplied predicate or '==' if none is supplied.

size_t count(T[] haystack, T needle, Pred pred)
size_t count(Buffer!(T) haystack, T needle, Pred pred)
size_t
count
(
T
Pred = DefaultPredicates.IsEqual!(T)
)
(
ref Buffer!(T) haystack
,
in T needle
,
Pred pred = Pred.init
)

Parameters

haystack Buffer!(T): The array to scan.
needle T: The pattern to match.
pred Pred: The evaluation predicate, which should return true if e1 is equal to e2 and false if not. This predicate may be any callable type.

Return Value

Type: size_t

The number of elements matching needle.

Examples

test!("==")(count("gbbbi", 'b'), 3);

auto buffer = createBuffer("gbbbi");
test!("==")(count(buffer, 'b'), 3);

count

Parameters

Return Value

Examples

Meta

Source