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 // Tencent is pleased to support the open source community by making RapidJSON available.
 // 
 // Copyright (C) 2015 THL A29 Limited, a Tencent company, and Milo Yip.
 //
 // Licensed under the MIT License (the "License"); you may not use this file except
 // in compliance with the License. You may obtain a copy of the License at
 //
 // http://opensource.org/licenses/MIT
 //
 // Unless required by applicable law or agreed to in writing, software distributed 
 // under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR 
 // CONDITIONS OF ANY KIND, either express or implied. See the License for the 
 // specific language governing permissions and limitations under the License.
  
 #ifndef RAPIDJSON_IEEE754_
 #define RAPIDJSON_IEEE754_
  
 #include "../rapidjson.h"
  
 RAPIDJSON_NAMESPACE_BEGIN
 namespace internal {
  
 class Double {
 public:
     Double() {}
     Double(double d) : d_(d) {}
     Double(uint64_t u) : u_(u) {}
  
     double Value() const { return d_; }
     uint64_t Uint64Value() const { return u_; }
  
     double NextPositiveDouble() const {
         RAPIDJSON_ASSERT(!Sign());
         return Double(u_ + 1).Value();
     }
  
     bool Sign() const { return (u_ & kSignMask) != 0; }
     uint64_t Significand() const { return u_ & kSignificandMask; }
     int Exponent() const { return static_cast<int>(((u_ & kExponentMask) >> kSignificandSize) - kExponentBias); }
  
     bool IsNan() const { return (u_ & kExponentMask) == kExponentMask && Significand() != 0; }
     bool IsInf() const { return (u_ & kExponentMask) == kExponentMask && Significand() == 0; }
     bool IsNanOrInf() const { return (u_ & kExponentMask) == kExponentMask; }
     bool IsNormal() const { return (u_ & kExponentMask) != 0 || Significand() == 0; }
     bool IsZero() const { return (u_ & (kExponentMask | kSignificandMask)) == 0; }
  
     uint64_t IntegerSignificand() const { return IsNormal() ? Significand() | kHiddenBit : Significand(); }
     int IntegerExponent() const { return (IsNormal() ? Exponent() : kDenormalExponent) - kSignificandSize; }
     uint64_t ToBias() const { return (u_ & kSignMask) ? ~u_ + 1 : u_ | kSignMask; }
  
     static int EffectiveSignificandSize(int order) {
         if (order >= -1021)
             return 53;
         else if (order <= -1074)
             return 0;
         else
             return order + 1074;
     }
  
 private:
     static const int kSignificandSize = 52;
     static const int kExponentBias = 0x3FF;
     static const int kDenormalExponent = 1 - kExponentBias;
     static const uint64_t kSignMask = RAPIDJSON_UINT64_C2(0x80000000, 0x00000000);
     static const uint64_t kExponentMask = RAPIDJSON_UINT64_C2(0x7FF00000, 0x00000000);
     static const uint64_t kSignificandMask = RAPIDJSON_UINT64_C2(0x000FFFFF, 0xFFFFFFFF);
     static const uint64_t kHiddenBit = RAPIDJSON_UINT64_C2(0x00100000, 0x00000000);
  
     union {
         double d_;
         uint64_t u_;
     };
 };
  
 } // namespace internal
 RAPIDJSON_NAMESPACE_END
  
 #endif // RAPIDJSON_IEEE754_