65 lines
3.0 KiB
C++
65 lines
3.0 KiB
C++
// 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
|
|
// 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
|
|
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
#ifndef DOUBLE_CONVERSION_CACHED_POWERS_H_
|
|
#define DOUBLE_CONVERSION_CACHED_POWERS_H_
|
|
|
|
#include "diy-fp.h"
|
|
|
|
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
|
|
|
|
#endif // DOUBLE_CONVERSION_CACHED_POWERS_H_
|