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### `ranges::ssize` <a id="range.prim.ssize">[[range.prim.ssize]]</a>
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The name `ranges::ssize` denotes a customization point object
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[[customization.point.object]]. The expression `ranges::ssize({}E)` for
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a subexpression `E` of type `T` is expression-equivalent to:
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- If `range_difference_t<T>` has width less than `ptrdiff_t`,
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`static_cast<ptrdiff_t>(ranges::{}size(E))`.
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- Otherwise, `static_cast<range_difference_t<T>>(ranges::size(E))`.
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