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Thinking in C++ Vol 2 - Practical Programming
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Name lookup issues

When the compiler encounters an identifier it must determine the type and scope (and in the case of variables, the lifetime) of the entity the identifier represents. Templates add complexity to the situation. Because the compiler doesn t know everything about a template when it first sees the definition, it can t tell whether the template is being used properly until it sees the template instantiation. This predicament leads to a two-phase process for template compilation.

Thinking in C++ Vol 2 - Practical Programming
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   Reproduced courtesy of Bruce Eckel, MindView, Inc. Design by Interspire