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Thinking in C++
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Automatic type conversion

In C and C++, if the compiler sees an expression or function call using a type that isn’t quite the one it needs, it can often perform an automatic type conversion from the type it has to the type it wants. In C++, you can achieve this same effect for user-defined types by defining automatic type conversion functions. These functions come in two flavors: a particular type of constructor and an overloaded operator.

Thinking in C++
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   Reproduced courtesy of Bruce Eckel, MindView, Inc. Design by Interspire