Decimal.minusOp

typeof(this) minusOp(ref DecimalContext ctx) const @safe pure nothrow @nogc

Unary minus under an explicit context (decNumber minus): 0 - x — negation rounded to the context precision (the operand's preferred exponent). Signaling NaNs signal and quieten (sign unchanged); quiet NaNs and ±∞ keep or flip their sign without flags; zeros give +0 on the operand's exponent (0 - ±0 = +0 under the default rounding).