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std.range.Indexed/indexed - multiple declarations

Function indexed

This struct takes two ranges, source and indices, and creates a view of source as if its elements were reordered according to indices. indices may include only a subset of the elements of source and may also repeat elements.

Indexed!(Source,Indices) indexed(Source, Indices) (
  Source source,
  Indices indices
);

Source must be a random access range. The returned range will be bidirectional or random-access if Indices is bidirectional or random-access, respectively.

Example

import std.algorithm.comparison : equal;
auto source = [1, 2, 3, 4, 5];
auto indices = [4, 3, 1, 2, 0, 4];
auto ind = indexed(source, indices);
assert(equal(ind, [5, 4, 2, 3, 1, 5]));
assert(equal(retro(ind), [5, 1, 3, 2, 4, 5]));

Struct Indexed

This struct takes two ranges, source and indices, and creates a view of source as if its elements were reordered according to indices. indices may include only a subset of the elements of source and may also repeat elements.

struct Indexed(Source, Indices)
  
if (isRandomAccessRange!Source && isInputRange!Indices && is(typeof(Source.init[ElementType!Indices.init])));

Source must be a random access range. The returned range will be bidirectional or random-access if Indices is bidirectional or random-access, respectively.

Properties

NameTypeDescription
back[get, set] autoRange primitives
front[get, set] autoRange primitives
indices[get] IndicesReturns the indices range.
save[get] typeof(this)Range primitives
source[get] SourceReturns the source range.

Methods

NameDescription
moveAt (index) Range primitives
moveBack () Range primitives
moveFront () Range primitives
opIndex (index) Range primitives
opIndexAssign (newVal, index) Range primitives
opSlice (a, b) Range primitives
physicalIndex (logicalIndex) Returns the physical index into the source range corresponding to a given logical index. This is useful, for example, when indexing an Indexed without adding another layer of indirection.
popBack () Range primitives
popFront () Range primitives

Example

import std.algorithm.comparison : equal;
auto source = [1, 2, 3, 4, 5];
auto indices = [4, 3, 1, 2, 0, 4];
auto ind = indexed(source, indices);
assert(equal(ind, [5, 4, 2, 3, 1, 5]));
assert(equal(retro(ind), [5, 1, 3, 2, 4, 5]));

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

Boost License 1.0.