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 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

 /* This Source Code Form is subject to the terms of the Mozilla Public

  * License, v. 2.0. If a copy of the MPL was not distributed with this

  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

 #ifndef nsTextFragmentImpl_h__

 #define nsTextFragmentImpl_h__

 #include <stdint.h>

 template<size_t size> struct Non8BitParameters;

 template<> struct Non8BitParameters<4> {

   static inline size_t mask() { return 0xff00ff00; }

   static inline uint32_t alignMask() { return 0x3; }

   static inline uint32_t numUnicharsPerWord() { return 2; }

 };

 template<> struct Non8BitParameters<8> {

   static inline size_t mask() {

     static const uint64_t maskAsUint64 = 0xff00ff00ff00ff00ULL;

     // We have to explicitly cast this 64-bit value to a size_t, or else

     // compilers for 32-bit platforms will warn about it being too large to fit

     // in the size_t return type. (Fortunately, this code isn't actually

     // invoked on 32-bit platforms -- they'll use the <4> specialization above.

     // So it is, in fact, OK that this value is too large for a 32-bit size_t.)

     return (size_t)maskAsUint64;

   }

   static inline uint32_t alignMask() { return 0x7; }

   static inline uint32_t numUnicharsPerWord() { return 4; }

 };

 #endif