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std.range.take_none - multiple declarations

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).

Prototype

auto takeNone(R)(
  R range
)
if (isInputRange!R);

Example

import std.algorithm : filter;
assert(takeNone([42, 27, 19]).empty);
assert(takeNone("dlang.org").empty);
assert(takeNone(filter!"true"([42, 27, 19])).empty);

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.

Prototype

auto takeNone(R)()
if (isInputRange!R);

Example

auto range = takeNone!(int[])();
assert(range.length == 0);
assert(range.empty);

Authors

Andrei Alexandrescu, David Simcha, and Jonathan M Davis. Credit for some of the ideas in building this module goes to Leonardo Maffi.

License

Boost License 1.0.

Comments