https://github.com/brendan0powers/cpppromise

An implementation of A+ promises in C++
https://github.com/brendan0powers/cpppromise

Last synced: about 1 month ago
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An implementation of A+ promises in C++

• Host: GitHub
• URL: https://github.com/brendan0powers/cpppromise
• Owner: brendan0powers
• License: bsd-3-clause
• Created: 2017-05-14T23:56:03.000Z (about 8 years ago)
• Default Branch: master
• Last Pushed: 2017-05-14T23:59:43.000Z (about 8 years ago)
• Last Synced: 2025-03-23T19:04:02.598Z (2 months ago)
• Language: C++
• Size: 5.86 KB
• Stars: 5
• Watchers: 2
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: Readme.md
  • License: LICENSE

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README

        
CppPromise is an experimental implementation of the JavaScript [A+](https://promisesaplus.com/) Promise standard in C++. It is designed to make asynchornous code easier to write and maintain. There are several other implementations of this concept already ([cpp-promise](https://github.com/xhawk18/promise-cpp), [q](https://github.com/grantila/q), [PoolQueue](https://github.com/rhashimoto/poolqueue)). CppPromise is mostly an excuse for me to improve my tempalte meta-programming skills. However, it may have some features that make it useful to others.

* __Header only__

* __Works on early C++11 compilers__ - (VS2013 in particular)

* __Type-safe__ - Promise objects are strongly typed, and most mistakes should be caught at compile time.

* __Framework agnostic__ - Does not have a bundled event system or timers. Feel free to use any framewok that makes sense (Boost.Asio, libuv, Qt, etc...)

CppPromise is __extermly experimental__ at the moment. There is currently no documentation, almost no comments, and no tests.

Here is a code example

```C++

    //Return an already resolved promise containing an int

    Promise testReturnInt()

    {

        return resolve(123);

    }

    //Return an already resolved promise containing a float

    Promise testReturnFloat()

    {

        return resolve(1.23f);

    }

    testReturnInt().then([](int iTest) {

       REQUIRE(iTest == 123);

       return testReturnFloat();

    }).then([](float fTest) {

        REQUIRE(fTest == Approx(1.23));

        testReturnInt();

    }).fail([](std::exception &e) {

        std::cout << "Exception was thrown: " << e.what() << std::endl;

    });

```