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Enum std.range.StoppingPolicy

Dictates how iteration in a zip and lockstep should stop. By default stop at the end of the shortest of all ranges.

enum StoppingPolicy : int { ... }

Enum members

longest Stop when the longest range is exhausted
requireSameLength Require that all ranges are equal
shortest Stop when the shortest range is exhausted


import std.algorithm.comparison : equal;
import std.exception : assertThrown;
import std.range.primitives;
import std.typecons : tuple;

auto a = [1, 2, 3];
auto b = [4, 5, 6, 7];

auto shortest = zip(StoppingPolicy.shortest, a, b);
    tuple(1, 4),
    tuple(2, 5),
    tuple(3, 6)

auto longest = zip(StoppingPolicy.longest, a, b);
    tuple(1, 4),
    tuple(2, 5),
    tuple(3, 6),
    tuple(0, 7)

auto same = zip(StoppingPolicy.requireSameLength, a, b);


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


Boost License 1.0.