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Learn how to validate objects in a boolean context without the usual harmful side effects.
In C++, there are a number of ways to provide Boolean tests for classes. Such support is either provided to make usage intuitive, to support generic programming, or both. We shall examine four popular ways of adding support for the popular and idiomatic if (object) {} construct. To conclude, we will discuss a new solution, without the pitfalls and dangers of the other four. Let the games begin.
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