ce152ed91f
* fix pairs, mpairs, mitems for cstring for JS backend * add mutation check for pairs and mpairs for strings and seqs * change the assertion message - modifying (changing elements) is not a problem, changing the length is
20 lines
450 B
Nim
20 lines
450 B
Nim
# bug #1833
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iterator myitems*[T](a: var seq[T]): var T {.inline.} =
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## iterates over each item of `a` so that you can modify the yielded value.
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var i = 0
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let L = len(a)
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while i < L:
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yield a[i]
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inc(i)
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assert(len(a) == L, "the length of the seq changed while iterating over it")
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# Works fine
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var xs = @[1,2,3]
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for x in myitems(xs):
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inc x
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# Tuples don't work
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var ys = @[(1,"a"),(2,"b"),(3,"c")]
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for y in myitems(ys):
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inc y[0]
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