| // Copyright 2010 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 | |
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| namespace double_conversion { | |
| class PowersOfTenCache { | |
| public: | |
| // Not all powers of ten are cached. The decimal exponent of two neighboring | |
| // cached numbers will differ by kDecimalExponentDistance. | |
| static const int kDecimalExponentDistance; | |
| static const int kMinDecimalExponent; | |
| static const int kMaxDecimalExponent; | |
| // Returns a cached power-of-ten with a binary exponent in the range | |
| // [min_exponent; max_exponent] (boundaries included). | |
| static void GetCachedPowerForBinaryExponentRange(int min_exponent, | |
| int max_exponent, | |
| DiyFp* power, | |
| int* decimal_exponent); | |
| // Returns a cached power of ten x ~= 10^k such that | |
| // k <= decimal_exponent < k + kCachedPowersDecimalDistance. | |
| // The given decimal_exponent must satisfy | |
| // kMinDecimalExponent <= requested_exponent, and | |
| // requested_exponent < kMaxDecimalExponent + kDecimalExponentDistance. | |
| static void GetCachedPowerForDecimalExponent(int requested_exponent, | |
| DiyFp* power, | |
| int* found_exponent); | |
| }; | |
| } // namespace double_conversion | |