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#### Casting <a id="numeric.sat.cast">[[numeric.sat.cast]]</a>
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``` cpp
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template<class R, class T>
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constexpr R saturate_cast(T x) noexcept;
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```
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*Constraints:* `R` and `T` are signed or unsigned integer
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types [[basic.fundamental]].
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*Returns:* If `x` is representable as a value of type `R`, `x`;
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otherwise, either the largest or smallest representable value of type
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`R`, whichever is closer to the value of `x`.
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