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std::execution::let_error - cppreference.com

From cppreference.com

execution::sender auto let_error( execution::sender auto input, std::invocable</*errors-sent-by*/(input)...> function );

 (since C++26)

Parameters

input - sender which once an error occurs, sends the errors to the function
function - invocable to be called with errors in case an error occurs by input sender

Return value

Returns a sender describing the task graph described by the input sender, with an added node of invoking the provided function with errors sent by the input sender, if an error occurs.

Example