Modern Chan Channel ChannelIterator

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ChannelIterator

Holds a for each loop's place while it receives from a channel.

Syntax

ChannelIterator( of T )

Notes

• The iterator protocol -- IsValid, Value, MoveNext -- which is what for each is rewritten into. Ordinary code names the type only when the loop has to stop early, resume, or interleave with another.
• Iteration consumes: each step receives a value, and the loop ends when the channel is closed and drained.
• It blocks between values, so for each over a channel nobody closes never ends.
• Requires -mt.

Examples

#import "std/tasks"
using tasks

dim ch as Channel( of int32 ) = Channel( of int32 )( 4 )
for i as int32 = 1 to 3
    dim as int32 v = i
    ch.Send( v )
next
ch.Close( )                  '' or the loop below would never end

for each v in ch
    print v                  '' 1 / 2 / 3
next
print "drained"

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Library: Goroutines and Channels
Category: Goroutines and Channels
Documented under: Members