Template:Bintodec
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This templates returns an integer of which the binary representation in reverse order forms the Boolean array indicating which of the parameters 1-7 are defined and non-empty.
Examples:
{{bintodec}}→ 0 [1]{{bintodec|5}}→ 1 [2]{{bintodec|5|2}}gives 3 [3]{{bintodec|3=x|5=y}}gives 20{{bintodec|3=x|5=y|3=}}gives 16
Without special provisions this template can be extended to work for arrays of at most 46 elements:
{{#expr:2^46}} gives 70368744177664 [4]
{{#expr:2^47}} gives 1.4073748835533E+14 [5]
