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Template std.algorithm.searching.any

Checks if any of the elements satisfies pred. !any can be used to verify that none of the elements satisfy pred. This is sometimes called exists in other languages.

template any(alias pred) ;

Contained Functions

NameDescription
any Returns true if and only if the input range range is non-empty and any value found in range satisfies the predicate pred. Performs (at most) Ο(range.length) evaluations of pred.

Example

import std.ascii : isWhite;
assert( all!(any!isWhite)(["a a", "b b"]));
assert(!any!(all!isWhite)(["a a", "b b"]));

Example

any can also be used without a predicate, if its items can be evaluated to true or false in a conditional statement. !any can be a convenient way to quickly test that none of the elements of a range evaluate to true. 

int[3] vals1 = [0, 0, 0];
assert(!any(vals1[])); //none of vals1 evaluate to true

int[3] vals2 = [2, 0, 2];
assert( any(vals2[]));
assert(!all(vals2[]));

int[3] vals3 = [3, 3, 3];
assert( any(vals3[]));
assert( all(vals3[]));

Authors

Andrei Alexandrescu

License

Boost License 1.0.