seastar::coroutine::lambda< Func > Class Template Reference

Detailed Description

template<typename Func>
class seastar::coroutine::lambda< Func >

Make a lambda coroutine safe for use in an outer coroutine with functions that accept continuations.

A lambda coroutine is not a safe parameter to a function that expects a regular Seastar continuation.

To use, wrap the lambda coroutine in seastar::coroutine::lambda(). The lambda coroutine must complete (co_await) in the same statement.

Example::

// `future::then()` expects a continuation, so not safe for lambda
// coroutines without seastar::coroutine::lambda.
co_await seastar::yield().then(seastar::coroutine::lambda([captures] () -> future<> {
    co_await seastar::coroutine::maybe_yield();
    // use of `captures` here can break without seastar::coroutine::lambda.
}));

Template Parameters

Func	type of function object (typically inferred)

#include <seastar/core/coroutine.hh>

Public Member Functions
	lambda (Func &&func)
template<typename... Args>
decltype(auto)	operator() (Args &&... args) const
	Calls the lambda coroutine object. Normally invoked by Seastar.

Constructor & Destructor Documentation

lambda()

template<typename Func >

seastar::coroutine::lambda< Func >::lambda ( Func &&  func )

inlineexplicit

Create a lambda coroutine wrapper from a function object, to be passed to a Seastar function that accepts a continuation.

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The documentation for this class was generated from the following file:

• seastar/core/coroutine.hh