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    volatile    [C++ Reference]
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<h2><a name="volatile" id="volatile">volatile</a></h2>
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<p>
The volatile keyword is an implementation-dependent modifier, used when
declaring variables, which prevents the compiler from optimizing those
variables. Volatile should be used with variables whose value can change in
unexpected ways (i.e. through an interrupt), which could conflict with
optimizations that the compiler might perform.
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