From 81ea8bd5ceb3dcae6af0b79c81a39ecbf2ba97a8 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Tue, 27 Mar 2018 22:16:01 +0200
Subject: Simplify the callback mechanism

---
 src/libstore/misc.cc | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

(limited to 'src/libstore/misc.cc')

diff --git a/src/libstore/misc.cc b/src/libstore/misc.cc
index a82aa4e9cfa5..adcce026fa1d 100644
--- a/src/libstore/misc.cc
+++ b/src/libstore/misc.cc
@@ -33,9 +33,11 @@ void Store::computeFSClosure(const PathSet & startPaths,
             state->pending++;
         }
 
-        queryPathInfo(path,
-            [&, path](ref<ValidPathInfo> info) {
-                // FIXME: calls to isValidPath() should be async
+        queryPathInfo(path, {[&, path](std::future<ref<ValidPathInfo>> fut) {
+            // FIXME: calls to isValidPath() should be async
+
+            try {
+                auto info = fut.get();
 
                 if (flipDirection) {
 
@@ -75,14 +77,13 @@ void Store::computeFSClosure(const PathSet & startPaths,
                     if (!--state->pending) done.notify_one();
                 }
 
-            },
-
-            [&, path](std::exception_ptr exc) {
+            } catch (...) {
                 auto state(state_.lock());
-                if (!state->exc) state->exc = exc;
+                if (!state->exc) state->exc = std::current_exception();
                 assert(state->pending);
                 if (!--state->pending) done.notify_one();
-            });
+            };
+        }});
     };
 
     for (auto & startPath : startPaths)
-- 
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