Add hasher specializations for enums, pairs and tuples

[folly.git] / folly / Memory.h

diff --git a/folly/Memory.h b/folly/Memory.h
index 6270cfab8194db5312873bf3c4789816b7976b9d..70bc451cb2221bad6ef984f4018613bdc4859135 100644 (file)
--- a/folly/Memory.h
+++ b/folly/Memory.h
@@ -1,5 +1,5 @@
 /*
- * Copyright 2014 Facebook, Inc.
+ * Copyright 2015 Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -56,6 +56,29 @@ typename std::enable_if<
   std::extent<T>::value != 0, std::unique_ptr<T, Dp>>::type
 make_unique(Args&&...) = delete;
 
+/**
+ *  to_shared_ptr
+ *
+ *  Convert unique_ptr to shared_ptr without specifying the template type
+ *  parameter and letting the compiler deduce it.
+ *
+ *  So you can write this:
+ *
+ *      auto sptr = to_shared_ptr(getSomethingUnique<T>());
+ *
+ *  Instead of this:
+ *
+ *      auto sptr = shared_ptr<T>(getSomethingUnique<T>());
+ *
+ *  Useful when `T` is long, such as:
+ *
+ *      using T = foobar::cpp2::FooBarServiceAsyncClient;
+ */
+template <typename T>
+std::shared_ptr<T> to_shared_ptr(std::unique_ptr<T>&& ptr) {
+  return std::shared_ptr<T>(std::move(ptr));
+}
+
 /**
  * A SimpleAllocator must provide two methods:
  *