Sometimes you have many constructors. Once we had a color class.
The following construction of a color object,
Color col(0);
seems possible. (maybe all rgb color value will be 0). But it makes
segmentation fault. Even all the constructors are explicit. Because
there is a constructor,
Color(int rgba[4]);
exists and 0 is a null pointer.
Copyright (C) 2007 Yamauchi, Hitoshi
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