icuSources/i18n/double-conversion-cached-powers.h

   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 {
  48
  49 class PowersOfTenCache {
  50  public:
  51
  52   // Not all powers of ten are cached. The decimal exponent of two neighboring
  53   // cached numbers will differ by kDecimalExponentDistance.
  54   static const int kDecimalExponentDistance;
  55
  56   static const int kMinDecimalExponent;
  57   static const int kMaxDecimalExponent;
  58
  59   // Returns a cached power-of-ten with a binary exponent in the range
  60   // [min_exponent; max_exponent] (boundaries included).
  61   static void GetCachedPowerForBinaryExponentRange(int min_exponent,
  62                                                    int max_exponent,
  63                                                    DiyFp* power,
  64                                                    int* decimal_exponent);
  65
  66   // Returns a cached power of ten x ~= 10^k such that
  67   //   k <= decimal_exponent < k + kCachedPowersDecimalDistance.
  68   // The given decimal_exponent must satisfy
  69   //   kMinDecimalExponent <= requested_exponent, and
  70   //   requested_exponent < kMaxDecimalExponent + kDecimalExponentDistance.
  71   static void GetCachedPowerForDecimalExponent(int requested_exponent,
  72                                                DiyFp* power,
  73                                                int* found_exponent);
  74 };
  75
  76 }  // namespace double_conversion
  77
  78 // ICU PATCH: Close ICU namespace
  79 U_NAMESPACE_END
  80
  81 #endif  // DOUBLE_CONVERSION_CACHED_POWERS_H_
  82 #endif // ICU PATCH: close #if !UCONFIG_NO_FORMATTING