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improve comment

This commit is contained in:
Sébastien Loriot 2015-11-04 10:59:20 +01:00
parent b344412fa7
commit c4fb9bcfe1
1 changed files with 4 additions and 1 deletions
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5
Snap_rounding_2/include/CGAL/Snap_rounding_traits_2.h
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@ -70,7 +70,10 @@ public:
NT x_floor = std::floor(CGAL::to_double(x_tmp));
NT y_floor = std::floor(CGAL::to_double(y_tmp));
//fix the double floor
// fix the usage of to_double and floor:
// there is no guarantee that the double approximation of *_tmp
// has the same integer part as the NT version. The while loops
// is a simple way to ensure that *_tmp are the true floor.
while(x_floor>x_tmp) x_floor-=NT(1);
while(y_floor>y_tmp) y_floor-=NT(1);
while(x_floor+1<=x_tmp) x_floor+=NT(1);