33 lines
961 B
Markdown
33 lines
961 B
Markdown
[variant.hash]
|
||
|
||
# 22 General utilities library [[utilities]](./#utilities)
|
||
|
||
## 22.6 Variants [[variant]](variant#hash)
|
||
|
||
### 22.6.12 Hash support [variant.hash]
|
||
|
||
[ð](#lib:hash,variant)
|
||
|
||
`template<class... Types> struct hash<variant<Types...>>;
|
||
`
|
||
|
||
[1](#1)
|
||
|
||
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L6999)
|
||
|
||
The specialization hash<variant<Types...>> is enabled ([[unord.hash]](unord.hash "22.10.19 Class template hash"))
|
||
if and only if every specialization in hash<remove_const_t<Types>>... is enabled[.](#1.sentence-1)
|
||
|
||
The member functions are not guaranteed to be noexcept[.](#1.sentence-2)
|
||
|
||
[ð](#lib:hash,monostate)
|
||
|
||
`template<> struct hash<monostate>;
|
||
`
|
||
|
||
[2](#2)
|
||
|
||
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/utilities.tex#L7011)
|
||
|
||
The specialization is enabled ([[unord.hash]](unord.hash "22.10.19 Class template hash"))[.](#2.sentence-1)
|