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 #ifndef DOUBLE_CONVERSION_BIGNUM_DTOA_H_

 #define DOUBLE_CONVERSION_BIGNUM_DTOA_H_

 #include "utils.h"

 namespace double_conversion {

 enum BignumDtoaMode {

   // Return the shortest correct representation.

   // For example the output of 0.299999999999999988897 is (the less accurate but

   // correct) 0.3.

   BIGNUM_DTOA_SHORTEST,

   // Same as BIGNUM_DTOA_SHORTEST but for single-precision floats.

   BIGNUM_DTOA_SHORTEST_SINGLE,

   // Return a fixed number of digits after the decimal point.

   // For instance fixed(0.1, 4) becomes 0.1000

   // If the input number is big, the output will be big.

   BIGNUM_DTOA_FIXED,

   // Return a fixed number of digits, no matter what the exponent is.

   BIGNUM_DTOA_PRECISION

 };

 // Converts the given double 'v' to ascii.

 // The result should be interpreted as buffer * 10^(point-length).

 // The buffer will be null-terminated.

 //

 // The input v must be > 0 and different from NaN, and Infinity.

 //

 // The output depends on the given mode:

 //  - SHORTEST: produce the least amount of digits for which the internal

 //   identity requirement is still satisfied. If the digits are printed

 //   (together with the correct exponent) then reading this number will give

 //   'v' again. The buffer will choose the representation that is closest to

 //   'v'. If there are two at the same distance, than the number is round up.

 //   In this mode the 'requested_digits' parameter is ignored.

 //  - FIXED: produces digits necessary to print a given number with

 //   'requested_digits' digits after the decimal point. The produced digits

 //   might be too short in which case the caller has to fill the gaps with '0's.

 //   Example: toFixed(0.001, 5) is allowed to return buffer="1", point=-2.

 //   Halfway cases are rounded up. The call toFixed(0.15, 2) thus returns

 //     buffer="2", point=0.

 //   Note: the length of the returned buffer has no meaning wrt the significance

 //   of its digits. That is, just because it contains '0's does not mean that

 //   any other digit would not satisfy the internal identity requirement.

 //  - PRECISION: produces 'requested_digits' where the first digit is not '0'.

 //   Even though the length of produced digits usually equals

 //   'requested_digits', the function is allowed to return fewer digits, in

 //   which case the caller has to fill the missing digits with '0's.

 //   Halfway cases are again rounded up.

 // 'BignumDtoa' expects the given buffer to be big enough to hold all digits

 // and a terminating null-character.

 void BignumDtoa(double v, BignumDtoaMode mode, int requested_digits,

                 Vector<char> buffer, int* length, int* point);

 }  // namespace double_conversion

 #endif  // DOUBLE_CONVERSION_BIGNUM_DTOA_H_