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You're missing the point. The system as I presented it will automatically update the flags field when a feature is by some compile-time means included or excluded. Your way requires an explicit...

Good point. I originally meant to have this hidden in a .cpp, but of course that's not possible since the changers are template instantiations.


As with template functions, template static...

1) Compare:

class NonTemplate {
static int var;
};
int NonTemplate::var;

template <typename T>
class Template {
static int var;

Yep, my fault. If the static member isn't referenced, it isn't instantiated. Here's something that works.

static unsigned featureField = 0;
template <int N> struct FeatureRegisterer {
...

Something like this:

static unsigned featureField = 0;
template <int N> struct FeatureRegisterer {
FeatureRegisterer() { featureField |= 1 << N; }
};
enum Features {
FeatureA, FeatureB,...