Add base::LazyInstance

base/compiler_specific.h

 // Copyright 2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MINI_CHROMIUM_BASE_COMPILER_SPECIFIC_H_
 #define MINI_CHROMIUM_BASE_COMPILER_SPECIFIC_H_
 
 #include "build/build_config.h"
 
 #if defined(COMPILER_MSVC)
@@ skipping 38 matching lines @@
 // Specify memory alignment for structs, classes, etc.
 // Use like:
 //   class ALIGNAS(16) MyClass { ... }
 //   ALIGNAS(16) int array[4];
 #if defined(COMPILER_MSVC)
 #define ALIGNAS(byte_alignment) __declspec(align(byte_alignment))
 #elif defined(COMPILER_GCC)
 #define ALIGNAS(byte_alignment) __attribute__((aligned(byte_alignment)))
 #endif
 
+// Return the byte alignment of the given type (available at compile time).  Use
+// sizeof(type) prior to checking __alignof to workaround Visual C++ bug:
+// http://goo.gl/isH0C
+// Use like:
+//   ALIGNOF(int32_t)  // this would be 4
+#if defined(COMPILER_MSVC)
+#define ALIGNOF(type) (sizeof(type) - sizeof(type) + __alignof(type))
+#elif defined(COMPILER_GCC)
+#define ALIGNOF(type) __alignof__(type)
+#endif
+
 #if defined(COMPILER_MSVC)
 #define WARN_UNUSED_RESULT
 #else
 #define WARN_UNUSED_RESULT __attribute__((warn_unused_result))
 #endif
 
 #if defined(COMPILER_MSVC)
 #define PRINTF_FORMAT(format_param, dots_param)
 #else
 #define PRINTF_FORMAT(format_param, dots_param) \
     __attribute__((format(printf, format_param, dots_param)))
 #endif
 
 #endif  // MINI_CHROMIUM_BASE_COMPILER_SPECIFIC_H_