Include <cassert> when using assert

Summary:
We were using `assert` without including anything that defines it.

Closes https://github.com/facebook/folly/issues/530

Reviewed By: yfeldblum

Differential Revision: D4337047

fbshipit-source-id: 327d19a685e7a4cc1e1eb6e471a6457fe9dee6c7

diff --git a/folly/detail/StaticSingletonManager.h b/folly/detail/StaticSingletonManager.h
index 6e4b63d690068d110ae751af8649c11c497999eb..749cf452965bed0549ce7dd3dcca2a511044e983 100644 (file)
--- a/folly/detail/StaticSingletonManager.h
+++ b/folly/detail/StaticSingletonManager.h
@@ -16,6 +16,7 @@
 
 #pragma once
 
+#include <cassert>
 #include <mutex>
 #include <typeindex>
 #include <unordered_map>