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### Bounded value <a id="alg.clamp">[[alg.clamp]]</a>
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``` cpp
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template<class T>
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constexpr const T& clamp(const T& v, const T& lo, const T& hi);
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template<class T, class Compare>
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constexpr const T& clamp(const T& v, const T& lo, const T& hi, Compare comp);
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```
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*Requires:* The value of `lo` shall be no greater than `hi`. For the
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first form, type `T` shall be `LessThanComparable`
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(Table [[tab:lessthancomparable]]).
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*Returns:* `lo` if `v` is less than `lo`, `hi` if `hi` is less than `v`,
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otherwise `v`.
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[*Note 1*: If NaN is avoided, `T` can be a floating-point
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type. — *end note*]
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*Complexity:* At most two comparisons.
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