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### Null pointers <a id="support.types.nullptr">[[support.types.nullptr]]</a>
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The type `nullptr_t` is a synonym for the type of a `nullptr`
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expression, and it has the characteristics described in
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[[basic.fundamental]] and [[conv.ptr]].
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[*Note 1*: Although `nullptr`’s address cannot be taken, the address of
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another `nullptr_t` object that is an lvalue can be
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taken. — *end note*]
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The macro `NULL` is an *implementation-defined* null pointer constant.
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[^1]
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