Re: float params of a gobject

Am Montag, den 10.07.2006, 12:45 -0300 schrieb Daniel Alonso:
Hi, I'm trying to define a gobject class with a floating number
property. In the init class procedure I define the property the
following way:

      param_spec = g_param_spec_float
              ("width" /* name */,
               _("Icon Width") /* nick */,
               _("The width of the svg icon") /* blurb */,
               G_MINFLOAT /* minimum */,
               G_MAXFLOAT /* maximum */,
               0.0 /* default_value */,
               (GParamFlags)(G_PARAM_READABLE | G_PARAM_WRITABLE));
      g_object_class_install_property (g_object_class,

This compiles fine, but when running the test program it raises a glib

(test:5073): GLib-GObject-CRITICAL **: g_param_spec_float: assertion
`default_value >= minimum && default_value <= maximum' failed

(test:5073): GLib-GObject-CRITICAL **: g_object_class_install_property:
assertion `G_IS_PARAM_SPEC (pspec)' failed

But default value 0.0 is equal G_MINFLOAT and lesser than G_MAXFLOAT,
isn't it? 

From the API docs [1]:

"The minimum positive value which can be held in a gfloat.

If you are interested in the smallest value which can be held in a
gfloat, use -G_MAX_FLOAT."

0.0 is not considered positive in this case, I think it works like:
G_MINFLOAT is the smalles floating number f that satisfies f > 0.

Since icons may only have a positive width, 1.0 might be a good default


Christian Neumair <chris gnome-de org>

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