Try again: folly::Singleton, a class for managing singletons

[folly.git] / folly / Exception.h

diff --git a/folly/Exception.h b/folly/Exception.h
index f0547c02545adf2797dba310d5a510a0d914958b..b4f6da1496de77db4c7a0017a0687296ffbaa461 100644 (file)
--- a/folly/Exception.h
+++ b/folly/Exception.h
@@ -109,6 +109,20 @@ void checkFopenErrorExplicit(FILE* fp, int savedErrno, Args&&... args) {
   }
 }
 
+template <typename E, typename V, typename... Args>
+void throwOnFail(V&& value, Args&&... args) {
+  if (!value) {
+    throw E(std::forward<Args>(args)...);
+  }
+}
+
+/**
+ * If cond is not true, raise an exception of type E.  E must have a ctor that
+ * works with const char* (a description of the failure).
+ */
+#define CHECK_THROW(cond, E) \
+  ::folly::throwOnFail<E>((cond), "Check failed: " #cond)
+
 }  // namespace folly
 
 #endif /* FOLLY_EXCEPTION_H_ */