Fix folly/Makefile.am

[folly.git] / folly / Memory.h

diff --git a/folly/Memory.h b/folly/Memory.h
index b58edf20a03aee7c1c4fe591dacc2b950250ad93..d4978d92e9ee00ceca890b6620f6a316d45b2007 100644 (file)
--- a/folly/Memory.h
+++ b/folly/Memory.h
@@ -1,5 +1,5 @@
 /*
- * Copyright 2015 Facebook, Inc.
+ * Copyright 2017 Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef FOLLY_MEMORY_H_
-#define FOLLY_MEMORY_H_
+#pragma once
 
 #include <folly/Traits.h>
 
@@ -37,25 +36,34 @@ namespace folly {
  * @author Xu Ning (xning@fb.com)
  */
 
-template<typename T, typename Dp = std::default_delete<T>, typename... Args>
-typename std::enable_if<!std::is_array<T>::value, std::unique_ptr<T, Dp>>::type
+#if __cplusplus >= 201402L || __cpp_lib_make_unique >= 201304L || \
+    (__ANDROID__ && __cplusplus >= 201300L) || _MSC_VER >= 1900
+
+/* using override */ using std::make_unique;
+
+#else
+
+template<typename T, typename... Args>
+typename std::enable_if<!std::is_array<T>::value, std::unique_ptr<T>>::type
 make_unique(Args&&... args) {
-  return std::unique_ptr<T, Dp>(new T(std::forward<Args>(args)...));
+  return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
 }
 
 // Allows 'make_unique<T[]>(10)'. (N3690 s20.9.1.4 p3-4)
-template<typename T, typename Dp = std::default_delete<T>>
-typename std::enable_if<std::is_array<T>::value, std::unique_ptr<T, Dp>>::type
+template<typename T>
+typename std::enable_if<std::is_array<T>::value, std::unique_ptr<T>>::type
 make_unique(const size_t n) {
-  return std::unique_ptr<T, Dp>(new typename std::remove_extent<T>::type[n]());
+  return std::unique_ptr<T>(new typename std::remove_extent<T>::type[n]());
 }
 
 // Disallows 'make_unique<T[10]>()'. (N3690 s20.9.1.4 p5)
-template<typename T, typename Dp = std::default_delete<T>, typename... Args>
+template<typename T, typename... Args>
 typename std::enable_if<
-  std::extent<T>::value != 0, std::unique_ptr<T, Dp>>::type
+  std::extent<T>::value != 0, std::unique_ptr<T>>::type
 make_unique(Args&&...) = delete;
 
+#endif
+
 /**
  * static_function_deleter
  *
@@ -78,7 +86,9 @@ make_unique(Args&&...) = delete;
 
 template <typename T, void(*f)(T*)>
 struct static_function_deleter {
-  void operator()(T* t) { f(t); }
+  void operator()(T* t) const {
+    f(t);
+  }
 };
 
 /**
@@ -97,13 +107,42 @@ struct static_function_deleter {
  *
  *  Useful when `T` is long, such as:
  *
- *      using T = foobar::cpp2::FooBarServiceAsyncClient;
+ *      using T = foobar::FooBarAsyncClient;
  */
 template <typename T, typename D>
 std::shared_ptr<T> to_shared_ptr(std::unique_ptr<T, D>&& ptr) {
   return std::shared_ptr<T>(std::move(ptr));
 }
 
+/**
+ *  to_weak_ptr
+ *
+ *  Make a weak_ptr and return it from a shared_ptr without specifying the
+ *  template type parameter and letting the compiler deduce it.
+ *
+ *  So you can write this:
+ *
+ *      auto wptr = to_weak_ptr(getSomethingShared<T>());
+ *
+ *  Instead of this:
+ *
+ *      auto wptr = weak_ptr<T>(getSomethingShared<T>());
+ *
+ *  Useful when `T` is long, such as:
+ *
+ *      using T = foobar::FooBarAsyncClient;
+ */
+template <typename T>
+std::weak_ptr<T> to_weak_ptr(const std::shared_ptr<T>& ptr) {
+  return std::weak_ptr<T>(ptr);
+}
+
+using SysBufferDeleter = static_function_deleter<void, ::free>;
+using SysBufferUniquePtr = std::unique_ptr<void, SysBufferDeleter>;
+inline SysBufferUniquePtr allocate_sys_buffer(size_t size) {
+  return SysBufferUniquePtr(::malloc(size));
+}
+
 /**
  * A SimpleAllocator must provide two methods:
  *
@@ -193,13 +232,11 @@ class StlAllocator {
   template <class U> StlAllocator(const StlAllocator<Alloc, U>& other)
     : alloc_(other.alloc()) { }
 
-  T* allocate(size_t n, const void* hint = nullptr) {
+  T* allocate(size_t n, const void* /* hint */ = nullptr) {
     return static_cast<T*>(alloc_->allocate(n * sizeof(T)));
   }
 
-  void deallocate(T* p, size_t n) {
-    alloc_->deallocate(p);
-  }
+  void deallocate(T* p, size_t /* n */) { alloc_->deallocate(p); }
 
   size_t max_size() const {
     return std::numeric_limits<size_t>::max();
@@ -410,5 +447,3 @@ std::shared_ptr<T> allocate_shared(Allocator&& allocator, Args&&... args) {
 template <class T> struct IsArenaAllocator : std::false_type { };
 
 }  // namespace folly
-
-#endif /* FOLLY_MEMORY_H_ */