1// © 2018 and later: Unicode, Inc. and others.
2// License & terms of use: http://www.unicode.org/copyright.html
3//
4// From the double-conversion library. Original license:
5//
6// Copyright 2010 the V8 project authors. All rights reserved.
7// Redistribution and use in source and binary forms, with or without
8// modification, are permitted provided that the following conditions are
9// met:
10//
11// * Redistributions of source code must retain the above copyright
12// notice, this list of conditions and the following disclaimer.
13// * Redistributions in binary form must reproduce the above
14// copyright notice, this list of conditions and the following
15// disclaimer in the documentation and/or other materials provided
16// with the distribution.
17// * Neither the name of Google Inc. nor the names of its
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20//
21// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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31// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32
33// ICU PATCH: ifdef around UCONFIG_NO_FORMATTING
34#include "unicode/utypes.h"
35#if !UCONFIG_NO_FORMATTING
36
37#ifndef DOUBLE_CONVERSION_CACHED_POWERS_H_
38#define DOUBLE_CONVERSION_CACHED_POWERS_H_
39
40// ICU PATCH: Customize header file paths for ICU.
41
42#include "double-conversion-diy-fp.h"
43
44// ICU PATCH: Wrap in ICU namespace
45U_NAMESPACE_BEGIN
46
47namespace double_conversion {
48
49namespace PowersOfTenCache {
50
51 // Not all powers of ten are cached. The decimal exponent of two neighboring
52 // cached numbers will differ by kDecimalExponentDistance.
53 static const int kDecimalExponentDistance = 8;
54
55 static const int kMinDecimalExponent = -348;
56 static const int kMaxDecimalExponent = 340;
57
58 // Returns a cached power-of-ten with a binary exponent in the range
59 // [min_exponent; max_exponent] (boundaries included).
60 void GetCachedPowerForBinaryExponentRange(int min_exponent,
61 int max_exponent,
62 DiyFp* power,
63 int* decimal_exponent);
64
65 // Returns a cached power of ten x ~= 10^k such that
66 // k <= decimal_exponent < k + kCachedPowersDecimalDistance.
67 // The given decimal_exponent must satisfy
68 // kMinDecimalExponent <= requested_exponent, and
69 // requested_exponent < kMaxDecimalExponent + kDecimalExponentDistance.
70 void GetCachedPowerForDecimalExponent(int requested_exponent,
71 DiyFp* power,
72 int* found_exponent);
73
74} // namespace PowersOfTenCache
75
76} // namespace double_conversion
77
78// ICU PATCH: Close ICU namespace
79U_NAMESPACE_END
80
81#endif // DOUBLE_CONVERSION_CACHED_POWERS_H_
82#endif // ICU PATCH: close #if !UCONFIG_NO_FORMATTING
83