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-// © 2017 and later: Unicode, Inc. and others.
-// License & terms of use: http://www.unicode.org/copyright.html
-
-#include "unicode/utypes.h"
-
-#if !UCONFIG_NO_FORMATTING
-#ifndef __NUMBER_ROUNDINGUTILS_H__
-#define __NUMBER_ROUNDINGUTILS_H__
-
-#include "number_types.h"
-
-U_NAMESPACE_BEGIN
-namespace number {
-namespace impl {
-namespace roundingutils {
-
-enum Section {
- SECTION_LOWER_EDGE = -1,
- SECTION_UPPER_EDGE = -2,
- SECTION_LOWER = 1,
- SECTION_MIDPOINT = 2,
- SECTION_UPPER = 3
-};
-
-/**
- * Converts a rounding mode and metadata about the quantity being rounded to a boolean determining
- * whether the value should be rounded toward infinity or toward zero.
- *
- * <p>The parameters are of type int because benchmarks on an x86-64 processor against OpenJDK
- * showed that ints were demonstrably faster than enums in switch statements.
- *
- * @param isEven Whether the digit immediately before the rounding magnitude is even.
- * @param isNegative Whether the quantity is negative.
- * @param section Whether the part of the quantity to the right of the rounding magnitude is
- * exactly halfway between two digits, whether it is in the lower part (closer to zero), or
- * whether it is in the upper part (closer to infinity). See {@link #SECTION_LOWER}, {@link
- * #SECTION_MIDPOINT}, and {@link #SECTION_UPPER}.
- * @param roundingMode The integer version of the {@link RoundingMode}, which you can get via
- * {@link RoundingMode#ordinal}.
- * @param status Error code, set to U_FORMAT_INEXACT_ERROR if the rounding mode is kRoundUnnecessary.
- * @return true if the number should be rounded toward zero; false if it should be rounded toward
- * infinity.
- */
-inline bool
-getRoundingDirection(bool isEven, bool isNegative, Section section, RoundingMode roundingMode,
- UErrorCode &status) {
- switch (roundingMode) {
- case RoundingMode::UNUM_ROUND_UP:
- // round away from zero
- return false;
-
- case RoundingMode::UNUM_ROUND_DOWN:
- // round toward zero
- return true;
-
- case RoundingMode::UNUM_ROUND_CEILING:
- // round toward positive infinity
- return isNegative;
-
- case RoundingMode::UNUM_ROUND_FLOOR:
- // round toward negative infinity
- return !isNegative;
-
- case RoundingMode::UNUM_ROUND_HALFUP:
- switch (section) {
- case SECTION_MIDPOINT:
- return false;
- case SECTION_LOWER:
- return true;
- case SECTION_UPPER:
- return false;
- default:
- break;
- }
- break;
-
- case RoundingMode::UNUM_ROUND_HALFDOWN:
- switch (section) {
- case SECTION_MIDPOINT:
- return true;
- case SECTION_LOWER:
- return true;
- case SECTION_UPPER:
- return false;
- default:
- break;
- }
- break;
-
- case RoundingMode::UNUM_ROUND_HALFEVEN:
- switch (section) {
- case SECTION_MIDPOINT:
- return isEven;
- case SECTION_LOWER:
- return true;
- case SECTION_UPPER:
- return false;
- default:
- break;
- }
- break;
-
- default:
- break;
- }
-
- status = U_FORMAT_INEXACT_ERROR;
- return false;
-}
-
-/**
- * Gets whether the given rounding mode's rounding boundary is at the midpoint. The rounding
- * boundary is the point at which a number switches from being rounded down to being rounded up.
- * For example, with rounding mode HALF_EVEN, HALF_UP, or HALF_DOWN, the rounding boundary is at
- * the midpoint, and this function would return true. However, for UP, DOWN, CEILING, and FLOOR,
- * the rounding boundary is at the "edge", and this function would return false.
- *
- * @param roundingMode The integer version of the {@link RoundingMode}.
- * @return true if rounding mode is HALF_EVEN, HALF_UP, or HALF_DOWN; false otherwise.
- */
-inline bool roundsAtMidpoint(int roundingMode) {
- switch (roundingMode) {
- case RoundingMode::UNUM_ROUND_UP:
- case RoundingMode::UNUM_ROUND_DOWN:
- case RoundingMode::UNUM_ROUND_CEILING:
- case RoundingMode::UNUM_ROUND_FLOOR:
- return false;
-
- default:
- return true;
- }
-}
-
-/**
- * Computes the number of fraction digits in a double. Used for computing maxFrac for an increment.
- * Calls into the DoubleToStringConverter library to do so.
- */
-digits_t doubleFractionLength(double input);
-
-} // namespace roundingutils
-
-
-/**
- * Encapsulates a Precision and a RoundingMode and performs rounding on a DecimalQuantity.
- *
- * This class does not exist in Java: instead, the base Precision class is used.
- */
-class RoundingImpl {
- public:
- RoundingImpl() = default; // default constructor: leaves object in undefined state
-
- RoundingImpl(const Precision& precision, UNumberFormatRoundingMode roundingMode,
- const CurrencyUnit& currency, UErrorCode& status);
-
- static RoundingImpl passThrough();
-
- /** Required for ScientificFormatter */
- bool isSignificantDigits() const;
-
- /**
- * Rounding endpoint used by Engineering and Compact notation. Chooses the most appropriate multiplier (magnitude
- * adjustment), applies the adjustment, rounds, and returns the chosen multiplier.
- *
- * <p>
- * In most cases, this is simple. However, when rounding the number causes it to cross a multiplier boundary, we
- * need to re-do the rounding. For example, to display 999,999 in Engineering notation with 2 sigfigs, first you
- * guess the multiplier to be -3. However, then you end up getting 1000E3, which is not the correct output. You then
- * change your multiplier to be -6, and you get 1.0E6, which is correct.
- *
- * @param input The quantity to process.
- * @param producer Function to call to return a multiplier based on a magnitude.
- * @return The number of orders of magnitude the input was adjusted by this method.
- */
- int32_t
- chooseMultiplierAndApply(impl::DecimalQuantity &input, const impl::MultiplierProducer &producer,
- UErrorCode &status);
-
- void apply(impl::DecimalQuantity &value, UErrorCode &status) const;
-
- /** Version of {@link #apply} that obeys minInt constraints. Used for scientific notation compatibility mode. */
- void apply(impl::DecimalQuantity &value, int32_t minInt, UErrorCode status);
-
- private:
- Precision fPrecision;
- UNumberFormatRoundingMode fRoundingMode;
- bool fPassThrough;
-};
-
-
-} // namespace impl
-} // namespace number
-U_NAMESPACE_END
-
-#endif //__NUMBER_ROUNDINGUTILS_H__
-
-#endif /* #if !UCONFIG_NO_FORMATTING */