This library provides high level constructs for implementing algorithms that eases the use of multiple CPU cores while minimizing the contention.

The future implementaton differs in several aspects compared to the C++11/14/17 standard futures: It provides continuations and joins, which were just added in a C++17 TS. But more important this futures propagate values through the graph and not futures. This allows an easy way of creating splits. That means a single future can have multiple continuations into different directions. An other important difference is that the futures support cancellation. So if one is not anymore interested in the result of a future, then one can destroy the future without the need to wait until the future is fullfilled, as it is the case with std::future (and boost::future). An already started future will run until its end, but will not trigger any continuation. So in all these cases, all chained continuations will never be triggered. Additionally the future interface is designed in a way, that one can use build in or custom build executors.

Since one can create with futures only graphs for single use, this library provides as well channels. With these channels one can build graphs, that can be used for multiple invocations.

  • Futures —

    Futures class and related functions

  • Channels —

    This library implements the channel model of interprocess communication.

  • Executors —

    A collection of executors with different strategies to run tasks.

Source Code

The source code is hosted on github.

Examples

close close_example.cpp
 Called on an await-process whenever the process state is `await_forever` and the incoming queue went dry.
process process_example.cpp
 Describes a process that gets executed whenever a value is passed into the channel
future::recover recover_example.cpp
 Creates a recoverable future on the current object.
future::then then_continuation_example.cpp
then_split_example.cpp
 Creates a continuation on the current future.
receiver::operator| operator_pipe_example.cpp
 Attaches a new process to the channel.
receiver::set_ready set_ready_example.cpp
 Sets the receiver ready to receive values.
sender::operator() call_operator_example.cpp
 Sends a new value into the channel
stlab::async async_example.cpp
 Run a function on a specified executor
stlab::channel channel_example.cpp
 Creates a pair that consists of a sender and a receiver
stlab::executor executor_example.cpp
 Executor wrapper class
stlab::join join_example.cpp
 Creates a future that joins all passed arguments
stlab::merge merge_example.cpp
 Creates a future that merges all passed arguments
stlab::package package_example.cpp
 Create a packaged_task/future pair
stlab::when_all when_all_example.cpp
 Creates a joining future
stlab::when_any when_any_example.cpp
 Creates a future that continues on the first success of any futures passed
stlab::zip zip_example.cpp
 It creates a process that zips all passed arguments and returns a receiver.

Requirements

  • C++14 compliant compiler (clang 3.6, gcc 5.3, Visual Studio 2015 Update 3)
  • boost 1.60.0 (optional, variant and test for executing the UnitTests)

Authors

Sean Parent, Foster Brereton, Felix Petriconi