Defined in header `<bit>` | ||
---|---|---|

template< class T > constexpr T ceil2(T x) noexcept; | (since C++20) |

Calculates the smallest integral power of two that is not smaller than `x`

. If that value is not representable in `T`

, the result is unspecified.

This overload only participates in overload resolution if `T`

is an unsigned integer type (that is, `unsigned char`

, `unsigned short`

, `unsigned int`

, `unsigned long`

, `unsigned long long`

, or an extended unsigned integer type).

The smallest integral power of two that is not smaller than `x`

, or an unspecified value if the result cannot be represented in `T`

.

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