tmp/tmpt08_b8dz/{from.md → to.md}
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| 1 |
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### Counting <a id="bit.count">[[bit.count]]</a>
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In the following descriptions, let `N` denote
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`numeric_limits<T>::digits`.
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``` cpp
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template<class T>
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constexpr int countl_zero(T x) noexcept;
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```
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*Constraints:* `T` is an unsigned integer type [[basic.fundamental]].
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*Returns:* The number of consecutive `0` bits in the value of `x`,
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starting from the most significant bit.
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[*Note 1*: Returns `N` if `x == 0`. — *end note*]
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``` cpp
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template<class T>
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constexpr int countl_one(T x) noexcept;
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```
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*Constraints:* `T` is an unsigned integer type [[basic.fundamental]].
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*Returns:* The number of consecutive `1` bits in the value of `x`,
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starting from the most significant bit.
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[*Note 2*: Returns `N` if
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`x == numeric_limits<T>::max()`. — *end note*]
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``` cpp
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template<class T>
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constexpr int countr_zero(T x) noexcept;
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```
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*Constraints:* `T` is an unsigned integer type [[basic.fundamental]].
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*Returns:* The number of consecutive `0` bits in the value of `x`,
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starting from the least significant bit.
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[*Note 3*: Returns `N` if `x == 0`. — *end note*]
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``` cpp
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template<class T>
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constexpr int countr_one(T x) noexcept;
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```
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*Constraints:* `T` is an unsigned integer type [[basic.fundamental]].
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*Returns:* The number of consecutive `1` bits in the value of `x`,
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starting from the least significant bit.
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[*Note 4*: Returns `N` if
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`x == numeric_limits<T>::max()`. — *end note*]
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``` cpp
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template<class T>
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constexpr int popcount(T x) noexcept;
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```
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*Constraints:* `T` is an unsigned integer type [[basic.fundamental]].
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*Returns:* The number of `1` bits in the value of `x`.
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