Re: [Boost-users] Constant floats

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 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 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: 914-259-6499 Reply-to: hadsell@blueskystudios.com Blue Sky Studios http://www.blueskystudios.com 44 South Broadway, White Plains, NY 10601

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