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4.5.4 Unary Adding Operators

Static Semantics

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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 : Treturn T
function "-"(Right : Treturn T
NOTES
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17  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. 

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