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To avoid having a .cpp just for an extern variable definition, `static` has been chosen over `extern`. As the `EEPROMClass` class simply wraps functionality located elsewhere, it is completely compiled away. Even though each translation unit which includes the header will get a copy with internal linkage, there is no associated overhead. More info [here](http://stackoverflow.com/questions/29098518/extern-variable-only-in-header-unexpectedly-working-why) |
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