Meta operators (IIII)

• Other meta operators:
• Assignment: The traditional op= (eg +=)
• Negation: Infix relational operators can be used as !op
• That is, $a !eq $b is equivalent to !($a eq $b)
• Reversing: Rop reverses the arguments to op
• So $a R- $b is the same as $b - $a

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