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undefined behavior [ISO/IEC 14882-2003]
Behavior, such as might arise upon use of an erroneous program construct or erroneous data, for which the C++ Standard imposes no requirements. Undefined behavior may also be expected when the C++ Standard omits the description of any explicit definition of behavior, or defines the behavior to be ill-formed, with no diagnostic required.
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unsafe function-like macro
A #function-like macro whose expansion causes one or more of its arguments not to be evaluated exactly once.
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