Learning D by 2015

Author:2015
Language: eng
Format: mobi, epub
Publisher: Packt Publishing

There are no special requirements on the return value of the front primitive. Elements can be returned by value or by reference, they can be qualified or unqualified, they can be inferred via auto, and so on. Any qualifiers, storage classes, or attributes that can be applied to functions and their return values can be used with any range function, though it might not always make sense to do so.

Forward ranges

The most basic of the higher-order ranges is the forward range. This is defined as an input range that allows its current point of iteration to be saved via a primitive appropriately named save. Effectively, the implementation should return a copy of the current state of the range. For ranges that are struct types, it could be as simple as:

auto save() { return this; }

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