Re: [Boost-users] Constant floats

From: Robert Dailey (rcdailey_at_[hidden])
Date: 2007-12-10 15:48:24

Apologies, let me elaborate: When I said "I'm not 100% sure if the above is
legal C++", I meant that I'm not sure if default-constructing parameter 'a'
the way I am in my previous snippet is legal (I know that the static const
float part is illegal)

On Dec 10, 2007 2:33 PM, Robert Dailey <rcdailey_at_[hidden]> wrote:

> I'm going to be using this float to default-initialize a construction
> parameter. For example:
>
> struct default_alpha
> {
>     static const float value = 1.0f;
> };
>
> class foo
> {
>     foo( float r, float g, float b, float a = default_alpha::value );
> };
>
> I'm not 100% sure if the above is legal C++. I haven't gotten to the point
> to where I could test it. I suppose I could try it with integrals, but I
> just haven't gotten around to it.
>
> On Dec 10, 2007 12:21 PM, Richard Hadsell <hadsell_at_[hidden]>
> wrote:
>
> >  Robert Dailey wrote:
> >
> > Is there a way I can define constant floats within class scope like you
> > can with integral values? I was hoping boost could help in this area. For
> > example:
> >
> > struct default_alpha
> > {
> >     static const float value = 1.0f;
> > };
> >
> > The above is not legal, of course. Anyone? Thanks.
> >
> > In .h header:
> >
> > struct default_alpha
> > {
> >     static const float value;
> > };
> >
> > In .cc source file:
> >
> > const float default_alpha::value = 1.0f;
> >
> > Is this answer too simple?
> >
> > --
> > Dick Hadsell			914-259-6320  Fax: [phone]
> > Reply-to:			hadsell_at_[hidden]
> > Blue Sky Studios                http://www.blueskystudios.com
> > 44 South Broadway, White Plains, NY 10601
> >
> >
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>
>