Well, the namespace idea won't work either. There's certain details I
omitted because I wasn't sure if they would be directly related to the
issue. However I'll go ahead and elaborate now.
I plan to specialize the struct containing the float to determine what
'value' I want. For example:
template< typename T >
struct default_alpha;
template<>
struct default_alpha<float>
{
static const float alpha = 1.0f;
};
template<>
struct default_alpha<unsigned char>
{
static const unsigned char = 255;
};
So, if I have a 'color' class that takes a template parameter, like below, I
can use the above specialized structures to figure out how to default
initialize the 'a' construction parameter.
template< typename T >
class Color
{
Color( T r, T g, T b, T a = default_alpha<T>::value );
};
Again, I wasn't sure if these new details were required from the very
beginning. Apologies for this. Thank you for everyone's continued help.
On Dec 11, 2007 1:14 AM, Roman Perepelitsa
Robert Dailey
writes: 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 ); };
You can use constant in namespace scope:
namespace default_alpha { static const float value = 1.0f; }
HTH, Roman Perepelitsa.
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