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Support iterators returning lent T (#11938)

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* lent iterators
* rebase tests
* update changelog
* fix comments, more tests
This commit is contained in:
cooldome 2019-08-31 18:23:54 +01:00 • committed by Andreas Rumpf
commit 2b565aad89
7 changed files with 116 additions and 27 deletions
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5
lib/system/iterators.nim
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@ -85,7 +85,7 @@ iterator pairs*[T](a: openArray[T]): tuple[key: int, val: T] {.inline.} =
yield (i, a[i])
inc(i)
iterator mpairs*[T](a: var openArray[T]): tuple[key:int, val:var T]{.inline.} =
iterator mpairs*[T](a: var openArray[T]): tuple[key: int, val: var T]{.inline.} =
## Iterates over each item of `a`. Yields ``(index, a[index])`` pairs.
## ``a[index]`` can be modified.
var i = 0
@ -102,7 +102,7 @@ iterator pairs*[IX, T](a: array[IX, T]): tuple[key: IX, val: T] {.inline.} =
if i >= high(IX): break
inc(i)
iterator mpairs*[IX, T](a:var array[IX, T]):tuple[key:IX,val:var T] {.inline.} =
iterator mpairs*[IX, T](a: var array[IX, T]): tuple[key: IX, val: var T] {.inline.} =
## Iterates over each item of `a`. Yields ``(index, a[index])`` pairs.
## ``a[index]`` can be modified.
var i = low(IX)
@ -179,7 +179,6 @@ iterator mpairs*(a: var cstring): tuple[key: int, val: var char] {.inline.} =
yield (i, a[i])
inc(i)
iterator items*[T](a: seq[T]): T {.inline.} =
## Iterates over each item of `a`.
var i = 0