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[coroutine.traits.general]
# 17 Language support library [[support]](./#support)
## 17.13 Coroutines [[support.coroutine]](support.coroutine#coroutine.traits.general)
### 17.13.3 Coroutine traits [[coroutine.traits]](coroutine.traits#general)
#### 17.13.3.1 General [coroutine.traits.general]
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L5798)
Subclause [[coroutine.traits]](coroutine.traits "17.13.3Coroutine traits") defines requirements on classes representing[*coroutine traits*](#def:coroutine_traits),
and defines the class templatecoroutine_traits that meets those requirements[.](#1.sentence-1)

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[coroutine.traits.primary]
# 17 Language support library [[support]](./#support)
## 17.13 Coroutines [[support.coroutine]](support.coroutine#coroutine.traits.primary)
### 17.13.3 Coroutine traits [[coroutine.traits]](coroutine.traits#primary)
#### 17.13.3.2 Class template coroutine_traits [coroutine.traits.primary]
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L5808)
The header [<coroutine>](coroutine.syn#header:%3ccoroutine%3e "17.13.2Header <coroutine> synopsis[coroutine.syn]") defines the primary templatecoroutine_traits such that
if ArgTypes is a parameter pack of types and
if the [*qualified-id*](expr.prim.id.qual#nt:qualified-id "7.5.5.3Qualified names[expr.prim.id.qual]") R::promise_type is valid and
denotes a type ([[temp.deduct]](temp.deduct "13.10.3Template argument deduction")),
then coroutine_traits<R, ArgTypes...> has the following publicly
accessible member:using promise_type = typename R::promise_type;
Otherwise, coroutine_traits<R, ArgTypes...> has no members[.](#1.sentence-2)
[2](#2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L5822)
Program-defined specializations of this template shall define a publicly
accessible nested type named promise_type[.](#2.sentence-1)