Currency.opUnary

Undocumented in source. Be warned that the author may not have intended to support it.
struct Currency(string _UNIT, long _BASE_UNIT = 1_000_000_000, long MAX_VALUE_IN_BASE_UNITS = 1_000_000_000)
const pure
opUnary
(
string OP
)
()
if (
OP == "-" ||
OP == "-"
)

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