std::execution::just_error
Defined in header <execution>
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inline
constexpr just_error_t just_error{
}
;
struct just_error_t { /*unspecified*/ } ; |
(since C++26) (customization point object) |
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Call signature |
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execution::
sender
auto just_error(
auto
&& error )
;
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(since C++26) | |
A sender factory that returns a sender which completes immediately by calling the receiver’s set_error()
Let e be a subexpression represented by an input error which will be injected and returned by the receiver. The expression just_error(e) is expression-equivalent to /*make-sender*/ (just_error, /*product-type*/ (e) )
Customization point objects
The name execution::just_error denotes a customization point object, which is a const function object of a literal
semiregular class type. The cv-unqualified version of its type is a tag type denoted as execution::just_error_t
All instances of execution::just_error_t are equal. The effects of invoking different instances of type execution::just_error_t
execution::just_error
Given a set of types Args..., if
std::declval
<Args>
(
)
meet the requirements for arguments to execution::just_error above, execution::just_error_t models
- std::invocable <execution:: just_error_t, Args...>
- std::invocable < const execution:: just_error_t, Args...>
- std::invocable <execution:: just_error_t &, Args...>
-
std::invocable
<
const execution::
just_error_t
&, Args...>
.
Otherwise, no function call operator of execution::just_error_t participates in overload resolution.
Notes
If the provided error is an lvalue reference, a copy is made inside the returned sender and a non-const lvalue reference to the copy is sent to the receiver’s set_error. If the provided value is an rvalue reference, it is moved into the returned sender and an rvalue reference to it is sent to the receiver’s set_error
Example
| This section is incomplete Reason: no example |