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65 lines
3.0 KiB
C++
65 lines
3.0 KiB
C++
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// Copyright 2010 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef DOUBLE_CONVERSION_CACHED_POWERS_H_
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#define DOUBLE_CONVERSION_CACHED_POWERS_H_
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#include "diy-fp.h"
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namespace double_conversion {
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class PowersOfTenCache {
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public:
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// Not all powers of ten are cached. The decimal exponent of two neighboring
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// cached numbers will differ by kDecimalExponentDistance.
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static const int kDecimalExponentDistance;
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static const int kMinDecimalExponent;
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static const int kMaxDecimalExponent;
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// Returns a cached power-of-ten with a binary exponent in the range
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// [min_exponent; max_exponent] (boundaries included).
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static void GetCachedPowerForBinaryExponentRange(int min_exponent,
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int max_exponent,
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DiyFp* power,
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int* decimal_exponent);
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// Returns a cached power of ten x ~= 10^k such that
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// k <= decimal_exponent < k + kCachedPowersDecimalDistance.
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// The given decimal_exponent must satisfy
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// kMinDecimalExponent <= requested_exponent, and
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// requested_exponent < kMaxDecimalExponent + kDecimalExponentDistance.
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static void GetCachedPowerForDecimalExponent(int requested_exponent,
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DiyFp* power,
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int* found_exponent);
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};
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} // namespace double_conversion
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#endif // DOUBLE_CONVERSION_CACHED_POWERS_H_
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