Assertion: predicate | /r/HasProperty | given in c++ text books
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text: If you look at typical examples of predicates that are given in C++ text books, then you'll find unary predicates such as isEven defined as bool isEven(int elem) { return elem %2 == 0; } or expressions such as bind2nd(greater<int>(),4), which is a unary predicate created from a predefined binary predicate by means of a so-called binder.