Explain crash when exception is thrown from Scope Guard

[folly.git] / folly / ScopeGuard.cpp

diff --git a/folly/ScopeGuard.cpp b/folly/ScopeGuard.cpp
new file mode 100644 (file)
index 0000000..1a06f4b
--- /dev/null
+++ b/folly/ScopeGuard.cpp
@@ -0,0 +1,27 @@
+/*
+ * Copyright 2016 Facebook, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "ScopeGuard.h"
+
+#include <iostream>
+
+/*static*/ void folly::ScopeGuardImplBase::warnAboutToCrash() noexcept {
+  // Ensure the availability of std::cerr
+  std::ios_base::Init ioInit;
+  std::cerr
+      << "This program will now terminate because a folly::ScopeGuard callback "
+         "threw an \nexception.\n";
+}