From f407e12321dada7470e561cefd576031cd9e4168 Mon Sep 17 00:00:00 2001
From: Christian Mollekopf <chrigi_1@fastmail.fm>
Date: Wed, 1 Apr 2015 10:59:36 +0200
Subject: dowhile cleanup, second dowhile version without separate condition.

---
 async/src/async.cpp | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

(limited to 'async/src/async.cpp')

diff --git a/async/src/async.cpp b/async/src/async.cpp
index 6eefd1b..20ba4e6 100644
--- a/async/src/async.cpp
+++ b/async/src/async.cpp
@@ -47,3 +47,43 @@ JobBase::~JobBase()
 {
 }
 
+static void asyncWhile(const std::function<void(std::function<void(bool)>)> &body, const std::function<void()> &completionHandler) {
+    body([body, completionHandler](bool complete) {
+        if (complete) {
+            completionHandler();
+        } else {
+            asyncWhile(body, completionHandler);
+        }
+    });
+}
+
+Job<void> Async::dowhile(Condition condition, ThenTask<void> body)
+{
+    return Async::start<void>([body, condition](Async::Future<void> &future) {
+        asyncWhile([condition, body](std::function<void(bool)> whileCallback) {
+            Async::start<void>(body).then<void>([whileCallback, condition]() {
+                whileCallback(!condition());
+            }).exec();
+        },
+        [&future]() { //while complete
+            future.setFinished();
+        });
+    });
+}
+
+Job<void> Async::dowhile(ThenTask<bool> body)
+{
+    return Async::start<void>([body](Async::Future<void> &future) {
+        asyncWhile([body](std::function<void(bool)> whileCallback) {
+            Async::start<bool>(body).then<bool, bool>([whileCallback](bool result) {
+                whileCallback(!result);
+                //FIXME this return value is only required because .then<bool, void> doesn't work
+                return true;
+            }).exec();
+        },
+        [&future]() { //while complete
+            future.setFinished();
+        });
+    });
+}
+
-- 
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