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int double_equal(double a, double b) {
return fabs(a-b) < 1000.0 * DBL_EPSILON;
}
template<class FwdIt>
FwdIt unique(FwdIt first, FwdIt last);
template<class FwdIt, class Pred>
FwdIt unique(FwdIt first, FwdIt last, Pred pr);
根据楼主的需要,应该有第二种形式。这是需传入一个谓语,用于浮点数的比较,楼主用的是自定义的double_equal。……
#define DBL_DIG 15 /* # of decimal digits of precision */
#define DBL_EPSILON 2.2204460492503131e-016 /* smallest such that 1.0+DBL_EPSILON != 1.0 */
#define DBL_MANT_DIG 53 /* # of bits in mantissa */
#define DBL_MAX 1.7976931348623158e+308 /* max value */
#define DBL_MAX_10_EXP 308 /* max decimal exponent */
#define DBL_MAX_EXP 1024 /* max binary exponent */
#define DBL_MIN 2.2250738585072014e-308 /* min positive value */
#define DBL_MIN_10_EXP (-307) /* min decimal exponent */
#define DBL_MIN_EXP (-1021) /* min binary exponent */
#define _DBL_RADIX 2 /* exponent radix */
#define _DBL_ROUNDS 1 /* addition rounding: near */
……
inline bool qFuzzyCompare(double p1, double p2)
{
return (std::abs(p1 - p2) <= 0.000000000001 * std::min(std::abs(p1), std::abs(p2)));
}