double-conversion-cached-powers.h (3503B)
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 18 // contributors may be used to endorse or promote products derived 19 // from this software without specific prior written permission. 20 // 21 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 24 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 25 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 26 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 27 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 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 45 U_NAMESPACE_BEGIN 46 47 namespace double_conversion::PowersOfTenCache { 48 49 // Not all powers of ten are cached. The decimal exponent of two neighboring 50 // cached numbers will differ by kDecimalExponentDistance. 51 static const int kDecimalExponentDistance = 8; 52 53 static const int kMinDecimalExponent = -348; 54 static const int kMaxDecimalExponent = 340; 55 56 // Returns a cached power-of-ten with a binary exponent in the range 57 // [min_exponent; max_exponent] (boundaries included). 58 void GetCachedPowerForBinaryExponentRange(int min_exponent, 59 int max_exponent, 60 DiyFp* power, 61 int* decimal_exponent); 62 63 // Returns a cached power of ten x ~= 10^k such that 64 // k <= decimal_exponent < k + kCachedPowersDecimalDistance. 65 // The given decimal_exponent must satisfy 66 // kMinDecimalExponent <= requested_exponent, and 67 // requested_exponent < kMaxDecimalExponent + kDecimalExponentDistance. 68 void GetCachedPowerForDecimalExponent(int requested_exponent, 69 DiyFp* power, 70 int* found_exponent); 71 72 } // namespace double_conversion::PowersOfTenCache 73 74 // ICU PATCH: Close ICU namespace 75 U_NAMESPACE_END 76 77 #endif // DOUBLE_CONVERSION_CACHED_POWERS_H_ 78 #endif // ICU PATCH: close #if !UCONFIG_NO_FORMATTING