Iostream header vs iostream class?

The relation between headers and classes isn't necessarily one-to-one; that's just a rule of thumb often taught to novice programmers. In fact, the C++ language standard does not specify any direct relation between classes, implementation files ( translation units ), and headers at all and the standard library often deviates from this rule.

Templates are a special case and you get into trouble if you declare a templated class or function and define it in another file. Since C++ compilers can only compile instantiations of templated elements (like std::vector) and not their generic versions (that would be std::vector), it needs to have the generic version available wherever an instantiation is made. Therefore, the implementation of a generic class is generally in its header file.

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