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Enum member std.variant.VariantN.allowed

Tells whether a type T is statically allowed for storage inside a VariantN object by looking T up in AllowedTypes.

struct VariantN
{
  // ...
  enum allowed(T) = is(T == VariantN) || (AllowedTypes.length == 0 || staticIndexOf!(T, AllowedTypes) >= 0);
  // ...
}

Authors

Andrei Alexandrescu

License

Boost License 1.0.