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Parenthesizing all variable names the in the CUBE() macro allows it to expand correctly (when invoked in this manner).
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However, if a parameter appears several times in the expansion, the macro may not work properly if the actual argument is an expression with side effects. Given the CUBE() macro above, the invocation:
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int a = 81 / CUBE(i++); |
expands to:
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int a = 81 / (i++ * i++ * i++); |
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