[bit.byteswap]

# 22 General utilities library [[utilities]](./#utilities)

## 22.11 Bit manipulation [[bit]](bit#byteswap)

### 22.11.4 byteswap [bit.byteswap]

[ð](#lib:byteswap)

`template<class T>
  constexpr T byteswap(T value) noexcept;
`

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L15760)

*Constraints*: T models [integral](concepts.arithmetic#concept:integral "18.4.7 Arithmetic concepts [concepts.arithmetic]")[.](#1.sentence-1)

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L15764)

*Mandates*: T does not have padding bits ([[basic.types.general]](basic.types.general "6.9.1 General"))[.](#2.sentence-1)

[3](#3)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L15768)

Let the sequence R comprise
the bytes of the object representation of value in reverse order[.](#3.sentence-1)

[4](#4)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L15772)

*Returns*: An object v of type T such that each byte in the object representation of v is equal to
the byte in the corresponding position in R[.](#4.sentence-1)
