C++程序  |  62行  |  2.44 KB

// Copyright 2013 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials provided
//       with the distribution.
//     * Neither the name of Google Inc. nor the names of its
//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#ifndef V8_TRIG_TABLE_H_
#define V8_TRIG_TABLE_H_


namespace v8 {
namespace internal {

class TrigonometricLookupTable : public AllStatic {
 public:
  // Casting away const-ness to use as argument for typed array constructor.
  static void* sin_table() {
    return const_cast<double*>(&kSinTable[0]);
  }

  static void* cos_x_interval_table() {
    return const_cast<double*>(&kCosXIntervalTable[0]);
  }

  static double samples_over_pi_half() { return kSamplesOverPiHalf; }
  static int samples() { return kSamples; }
  static int table_num_bytes() { return kTableSize * sizeof(*kSinTable); }
  static int table_size() { return kTableSize; }

 private:
  static const double kSinTable[];
  static const double kCosXIntervalTable[];
  static const int kSamples;
  static const int kTableSize;
  static const double kSamplesOverPiHalf;
};

} }  // namespace v8::internal

#endif  // V8_TRIG_TABLE_H_