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 // Copyright 2010 the V8 project authors. All rights reserved.
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 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
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 //
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 #ifndef DOUBLE_CONVERSION_FAST_DTOA_H_
 #define DOUBLE_CONVERSION_FAST_DTOA_H_
 
 #include "utils.h"
 
 namespace double_conversion {
 
 enum FastDtoaMode {
   // Computes the shortest representation of the given input. The returned
   // result will be the most accurate number of this length. Longer
   // representations might be more accurate.
   FAST_DTOA_SHORTEST,
   // Same as FAST_DTOA_SHORTEST but for single-precision floats.
   FAST_DTOA_SHORTEST_SINGLE,
   // Computes a representation where the precision (number of digits) is
   // given as input. The precision is independent of the decimal point.
   FAST_DTOA_PRECISION
 };
 
 // FastDtoa will produce at most kFastDtoaMaximalLength digits. This does not
 // include the terminating '\0' character.
 static const int kFastDtoaMaximalLength = 17;
 // Same for single-precision numbers.
 static const int kFastDtoaMaximalSingleLength = 9;
 
 // Provides a decimal representation of v.
 // The result should be interpreted as buffer * 10^(point - length).
 //
 // Precondition:
 //   * v must be a strictly positive finite double.
 //
 // Returns true if it succeeds, otherwise the result can not be trusted.
 // There will be *length digits inside the buffer followed by a null terminator.
 // If the function returns true and mode equals
 //   - FAST_DTOA_SHORTEST, then
 //     the parameter requested_digits is ignored.
 //     The result satisfies
 //         v == (double) (buffer * 10^(point - length)).
 //     The digits in the buffer are the shortest representation possible. E.g.
 //     if 0.099999999999 and 0.1 represent the same double then "1" is returned
 //     with point = 0.
 //     The last digit will be closest to the actual v. That is, even if several
 //     digits might correctly yield 'v' when read again, the buffer will contain
 //     the one closest to v.
 //   - FAST_DTOA_PRECISION, then
 //     the buffer contains requested_digits digits.
 //     the difference v - (buffer * 10^(point-length)) is closest to zero for
 //     all possible representations of requested_digits digits.
 //     If there are two values that are equally close, then FastDtoa returns
 //     false.
 // For both modes the buffer must be large enough to hold the result.
 bool FastDtoa(double d,
               FastDtoaMode mode,
               int requested_digits,
               Vector<char> buffer,
               int* length,
               int* decimal_point);
 
 }  // namespace double_conversion
 
 #endif  // DOUBLE_CONVERSION_FAST_DTOA_H_

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