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#ifndef SEEN_DECIMAL_ROUND_H
#define SEEN_DECIMAL_ROUND_H
#include <cmath>
#include "round.h"
namespace Inkscape {
/** Returns x rounded to the nearest \a nplaces decimal places.
Implemented in terms of Inkscape::round, i.e. we make no guarantees as to what happens if x is
half way between two rounded numbers. Add a note to the documentation if you care which
candidate is chosen for such case (round towards -infinity, +infinity, 0, or "even").
Note: nplaces is the number of decimal places without using scientific (e) notation, not the
number of significant figures. This function may not be suitable for values of x whose
magnitude is so far from 1 that one would want to use scientific (e) notation.
The current implementation happens to allow nplaces to be negative: e.g. nplaces=-2 means
rounding to a multiple of 100. May or may not be useful.
**/
inline double
decimal_round(double const x, int const nplaces)
{
double const multiplier = std::pow(10.0, nplaces);
return Inkscape::round( x * multiplier ) / multiplier;
}
}
#endif /* !SEEN_DECIMAL_ROUND_H */
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :
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