Adjacent Pairs Range

[Per Nordlöw via Digitalmars-d-learn]

On Monday, 14 September 2015 at 05:37:05 UTC, Sebastiaan Koppe 
wrote:
> What about using zip and a slice?

Slicing requires a RandomAccessRange (Array). This is too 
restrictive. We want to change operations such as adjacentTuples 
with for example map and reduce without the need for temporary 
copies of the whole range. This is the thing about D's standard 
library.

Read up on D's range concepts.