Re: [Boost-users] Constant floats

From: Robert Dailey (rcdailey_at_[hidden])
Date: 2007-12-10 15:33:26

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]
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>
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