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 // Copyright 2010 the V8 project authors. All rights reserved.

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 #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_