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trap representation [ISO/IEC 9899-1999]
Object representation that does not represent a value of the object type. Attempting to read the value of an object that has a trap representation other than by an expression that has a character type is undefined. Producing such a representation by a side effect that modifies all or any part of the object other than by an expression that has a character type is undefined.
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trust boundary
A boundary between a trusted execution context (or trusted data source) in which all sub-execution contexts (or data sources) are trusted by the system and a nontrusted execution context (or nontrusted data sink).
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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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