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Variants

std::execution:: just

From cppreference.net
Defined in header <execution>
struct just_t { /*unspecified*/ } ;
(1) (since C++26)
inline constexpr just_t just { } ;
(2) (since C++26)
(customization point object)
Call signature
execution :: sender auto just ( auto && ... values ) ;
(since C++26)

A sender factory that returns a sender which completes immediately by calling the receiver’s set_value() .

Let ts be a pack of subexpressions. The expression just ( ts... ) is expression-equivalent to /*make-sender*/ ( just, /*product-type*/ ( ts... ) )

Customization point objects

The name execution::just 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_t . See CustomizationPointObject for details.

Example