Decimal.plusOp

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

Unary plus under an explicit context (decNumber plus): 0 + x — the value rounded to the context precision with the operand's preferred exponent. NaNs: signaling quieten (INVALID_OPERATION), quiet return unchanged. ±∞ returns itself. Zeros give +0 on the operand's exponent (IEEE addition of unlike-signed zeros).