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Diffstat (limited to 'include/rapidjson/internal/ieee754.h')
-rw-r--r-- | include/rapidjson/internal/ieee754.h | 78 |
1 files changed, 0 insertions, 78 deletions
diff --git a/include/rapidjson/internal/ieee754.h b/include/rapidjson/internal/ieee754.h deleted file mode 100644 index 82bb0b99..00000000 --- a/include/rapidjson/internal/ieee754.h +++ /dev/null @@ -1,78 +0,0 @@ -// 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. All rights reserved. -// -// 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 unsigned EffectiveSignificandSize(int order) { - if (order >= -1021) - return 53; - else if (order <= -1074) - return 0; - else - return static_cast<unsigned>(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_ |