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#ifndef SEEN_DECIMAL_ROUND_H
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#define SEEN_DECIMAL_ROUND_H
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/** Returns x rounded to the nearest \a nplaces decimal places.
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Implemented in terms of Inkscape::round, i.e. we make no guarantees as to what happens if x is
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half way between two rounded numbers. Add a note to the documentation if you care which
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candidate is chosen for such case (round towards -infinity, +infinity, 0, or "even").
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Note: nplaces is the number of decimal places without using scientific (e) notation, not the
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number of significant figures. This function may not be suitable for values of x whose
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magnitude is so far from 1 that one would want to use scientific (e) notation.
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The current implementation happens to allow nplaces to be negative: e.g. nplaces=-2 means
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rounding to a multiple of 100. May or may not be useful.
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decimal_round(double const x, int const nplaces)
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double const multiplier = std::pow(10.0, nplaces);
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return Inkscape::round( x * multiplier ) / multiplier;
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#endif /* !SEEN_DECIMAL_ROUND_H */
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c-file-style:"stroustrup"
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c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
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// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :
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decimal-round.h
