Allow folly::io::Cursor to move backwards.

[folly.git] / folly / Memory.h

diff --git a/folly/Memory.h b/folly/Memory.h
index bcfa321c8635d6d20a411e1b828366cea1e4cb98..442dd4f688445e554eecaa41fecdbcde6645effc 100644 (file)
--- a/folly/Memory.h
+++ b/folly/Memory.h
@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef FOLLY_MEMORY_H_
-#define FOLLY_MEMORY_H_
+#pragma once
 
 #include <folly/Traits.h>
 
@@ -37,8 +36,9 @@ namespace folly {
  * @author Xu Ning (xning@fb.com)
  */
 
-#if __cplusplus >= 201402L || \
-    defined __cpp_lib_make_unique && __cpp_lib_make_unique >= 201304L
+#if __cplusplus >= 201402L ||                                              \
+    (defined __cpp_lib_make_unique && __cpp_lib_make_unique >= 201304L) || \
+    (defined(_MSC_VER) && _MSC_VER >= 1900)
 
 /* using override */ using std::make_unique;
 
@@ -87,7 +87,9 @@ 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);
+  }
 };
 
 /**
@@ -113,6 +115,12 @@ std::shared_ptr<T> to_shared_ptr(std::unique_ptr<T, D>&& ptr) {
   return std::shared_ptr<T>(std::move(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:
  *
@@ -417,5 +425,3 @@ std::shared_ptr<T> allocate_shared(Allocator&& allocator, Args&&... args) {
 template <class T> struct IsArenaAllocator : std::false_type { };
 
 }  // namespace folly
-
-#endif /* FOLLY_MEMORY_H_ */