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#ifndef SKY_ENGINE_WTF_DTOA_CACHED_POWERS_H_
#define SKY_ENGINE_WTF_DTOA_CACHED_POWERS_H_

#include "diy-fp.h"

namespace WTF {

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

} // namespace WTF

#endif  // SKY_ENGINE_WTF_DTOA_CACHED_POWERS_H_