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Improve multiple task handling (Task.all/any/some) in case of empty tasks-argument #60

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Mar 19, 2016
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Improve multiple task handling (Task.all/any/some) in case of empty tasks-argument #60

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10 changes: 10 additions & 0 deletions SwiftTask/SwiftTask.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -690,6 +690,10 @@ extension Task

public class func all(tasks: [Task]) -> Task<BulkProgress, [Value], Error>
{
guard !tasks.isEmpty else {
return Task<BulkProgress, [Value], Error>(value: [])
}

return Task<BulkProgress, [Value], Error> { machine, progress, fulfill, _reject, configure in

var completedCount = 0
Expand Down Expand Up @@ -737,6 +741,8 @@ extension Task

public class func any(tasks: [Task]) -> Task
{
precondition(!tasks.isEmpty, "`Task.any(tasks)` with empty `tasks` should not be called. It will never be fulfilled or rejected.")

return Task<Progress, Value, Error> { machine, progress, fulfill, _reject, configure in

var completedCount = 0
Expand Down Expand Up @@ -783,6 +789,10 @@ extension Task
/// This new task will NEVER be internally rejected.
public class func some(tasks: [Task]) -> Task<BulkProgress, [Value], Error>
{
guard !tasks.isEmpty else {
return Task<BulkProgress, [Value], Error>(value: [])
}

return Task<BulkProgress, [Value], Error> { machine, progress, fulfill, _reject, configure in

var completedCount = 0
Expand Down