[refwrap.comparisons]

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

## 22.10 Function objects [[function.objects]](function.objects#refwrap.comparisons)

### 22.10.6 Class template reference_wrapper [[refwrap]](refwrap#comparisons)

#### 22.10.6.6 Comparisons [refwrap.comparisons]

[ð](#itemdecl:1)

`friend constexpr bool operator==(reference_wrapper x, reference_wrapper y);
`

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L11824)

*Constraints*: The expression x.get() == y.get() is well-formed and
its result is convertible to bool[.](#1.sentence-1)

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L11829)

*Returns*: x.get() == y.get()[.](#2.sentence-1)

[ð](#itemdecl:2)

`friend constexpr bool operator==(reference_wrapper x, const T& y);
`

[3](#3)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L11839)

*Constraints*: The expression x.get() == y is well-formed and
its result is convertible to bool[.](#3.sentence-1)

[4](#4)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L11844)

*Returns*: x.get() == y[.](#4.sentence-1)

[ð](#itemdecl:3)

`friend constexpr bool operator==(reference_wrapper x, reference_wrapper<const T> y);
`

[5](#5)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L11854)

*Constraints*: is_const_v<T> is false and
the expression x.get() == y.get() is well-formed and
its result is convertible to bool[.](#5.sentence-1)

[6](#6)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L11860)

*Returns*: x.get() == y.get()[.](#6.sentence-1)

[ð](#itemdecl:4)

`friend constexpr auto operator<=>(reference_wrapper x, reference_wrapper y);
`

[7](#7)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L11870)

*Constraints*: The expression *synth-three-way*(x.get(), y.get()) is well-formed[.](#7.sentence-1)

[8](#8)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L11875)

*Returns*: *synth-three-way*(x.get(), y.get())[.](#8.sentence-1)

[ð](#itemdecl:5)

`friend constexpr auto operator<=>(reference_wrapper x, const T& y);
`

[9](#9)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L11885)

*Constraints*: The expression *synth-three-way*(x.get(), y) is well-formed[.](#9.sentence-1)

[10](#10)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L11890)

*Returns*: *synth-three-way*(x.get(), y)[.](#10.sentence-1)

[ð](#itemdecl:6)

`friend constexpr auto operator<=>(reference_wrapper x, reference_wrapper<const T> y);
`

[11](#11)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L11900)

*Constraints*: is_const_v<T> is false[.](#11.sentence-1)

The expression *synth-three-way*(x.get(), y.get()) is well-formed[.](#11.sentence-2)

[12](#12)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L11906)

*Returns*: *synth-three-way*(x.get(), y.get())[.](#12.sentence-1)
