Add skstd::move and skstd::forward.

include/core/SkTemplates.h

 
 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef SkTemplates_DEFINED
 #define SkTemplates_DEFINED
 
+#include "../private/SkTLogic.h"
 #include "SkMath.h"
 #include "SkTypes.h"
 #include <limits.h>
 #include <new>
 
 /** \file SkTemplates.h
 
     This file contains light-weight template classes for type-safe and exception-safe
     resource management.
 */
 
 /**
  *  Marks a local variable as known to be unused (to avoid warnings).
  *  Note that this does *not* prevent the local variable from being optimized away.
  */
 template<typename T> inline void sk_ignore_unused_variable(const T&) { }
 
-/**
- *  SkTIsConst<T>::value is true if the type T is const.
- *  The type T is constrained not to be an array or reference type.
- */
-template <typename T> struct SkTIsConst {
-    static T* t;
-    static uint16_t test(const volatile void*);
-    static uint32_t test(volatile void *);
-    static const bool value = (sizeof(uint16_t) == sizeof(test(t)));
-};
+template <typename T> inline typename SkTRemoveReference<T>::type&& SkMove(T&& t) {

[mtklein, 2015/08/05 17:48:00]

I'd personally be satisfied with

// SkMove == std::move
// SkForward == std::forward

+  return static_cast<typename SkTRemoveReference<T>::type&&>(t);
+}
+
+template <typename T> inline T&& SkTForward(typename SkTRemoveReference<T>::type& t) /*noexcept*/ {
+    return static_cast<T&&>(t);
+}
+template <typename T> inline T&& SkTForward(typename SkTRemoveReference<T>::type&& t) /*noexcept*/ {
+    static_assert(!SkTIsLValueReference<T>::value,
+                  "Forwarding an rvalue reference as an lvalue reference is not allowed.");
+    return static_cast<T&&>(t);
+}
 
 ///@{
 /** SkTConstType<T, CONST>::type will be 'const T' if CONST is true, 'T' otherwise. */
 template <typename T, bool CONST> struct SkTConstType {
     typedef T type;
 };
 template <typename T> struct SkTConstType<T, true> {
     typedef const T type;
 };
 ///@}
@@ skipping 490 matching lines @@
     /**
      * Returns void* because this object does not initialize the
      * memory. Use placement new for types that require a cons.
      */
     void* get() { return fStorage.get(); }
 private:
     SkAlignedSStorage<sizeof(T)*N> fStorage;
 };
 
 #endif