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std.range.takeNone
- multiple declarations
Function takeNone
Returns an empty range which is statically known to be empty and is
guaranteed to have length
and be random access regardless of R
's
capabilities.
auto auto takeNone(R)()
if (isInputRange!R);
Example
auto range = takeNone!(int[])();
writeln(range .length); // 0
assert(range .empty);
Application output
Running...
Function takeNone
Creates an empty range from the given range in Ο(1
). If it can, it
will return the same range type. If not, it will return
takeExactly(range, 0)
.
auto auto takeNone(R)
(
R range
)
if (isInputRange!R);
Example
import std .algorithm .iteration : filter;
assert(takeNone([42, 27, 19]). empty);
assert(takeNone("dlang.org"). empty);
assert(takeNone(filter!"true"([42, 27, 19])). empty);
Application output
Running...
Authors
Andrei Alexandrescu, David Simcha, Jonathan M Davis, and Jack Stouffer. Credit for some of the ideas in building this module goes to Leonardo Maffi.
License
Copyright © 1999-2018 by the D Language Foundation | Page generated by ddox.