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Function std.range.dropOne
Convenience function which calls
range
and returns range
. dropOne
makes it easier to pop an element from a range
and then pass it to another function within a single expression,
whereas popFront
would require multiple statements.
R dropOne(R)
(
R range
)
if (isInputRange!R);
dropBackOne
provides the same functionality but instead calls
range
.
Example
import std .algorithm .comparison : equal;
import std .algorithm .iteration : filterBidirectional;
import std .container .dlist : DList;
auto dl = DList!int(9, 1, 2, 3, 9);
assert(dl[] .dropOne() .dropBackOne() .equal([1, 2, 3]));
auto a = [1, 2, 3];
writeln(a .dropOne()); // [2, 3]
writeln(a .dropBackOne()); // [1, 2]
string s = "日本語";
import std .exception : assumeWontThrow;
assert(assumeWontThrow(s .dropOne() == "本語"));
assert(assumeWontThrow(s .dropBackOne() == "日本"));
auto bd = filterBidirectional!"true"([1, 2, 3]);
assert(bd .dropOne() .equal([2, 3]));
assert(bd .dropBackOne() .equal([1, 2]));
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 © 1999-2022 by the D Language Foundation | Page generated by ddox.