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The unary adding operators + (identity) and −− (negation) are predefined for every specific numeric type T with their conventional meaning. They have the following specifications:
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function "+"(Right : T) return T function "−"(Right : T) return T
NOTES
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15 For modular integer types, the unary adding operator −−, when given a nonzero operand, returns the result of subtracting the value of the operand from the modulus; for a zero operand, the result is zero.