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> Async C++14 platform independent continuation chainer providing light and allocation aware futures
This library provides full feature support of: This library provides full feature support of:
* async continuation chaining using **callbacks** (*then*). * lazy async continuation chaining based on **callbacks** (*then*).
* **no enforced type-erasure** which means we need **extremely fewer heap allocations** . * **no enforced type-erasure** which means we need **less heap allocations**, strictly following the **"don't pay for what you don't use" ** principle.
* support for **finite logical connections** between continuables through an **all, any or sequence** strategy. * support for **connections** between continuables through an **all, any or sequence** strategy.
* **syntactic sugar** for attaching callbacks to a continuation like partial invocation or tuple unpacking. * **error handling** through exceptions or custom types.
* **syntactic sugar** for instance: partial invocation, tuple unpacking and executors.
## The basics
* Supply a continuable which is invoked lazily upon request:
```cpp
auto http_request(std::string url) {
return cti::make_continuable<std::string>([url = std::move(url)](auto&& promise) {
// Perform the actual request through a different library,
// resolve the promise upon completion of the task.
promise.set_value("<html> ... </html>");
});
}
```
* Continue the continuation using `.then(...)` and `.fail(...)`
```cpp
http_request("example.com")
.then([] (std::string result) {
// Do something...
return http_request("example.com/2")
})
.then([] (std::string result) {
// Do more...
});
```
* b
```cpp
h
```
* c
```cpp
h
```
* d
> **Note:** This library only provides the facility for building asynchronous functions. Thus functions shown in the examples and the documentation like `http_request`, `mysql_query` or `read_file` aren't provided by this library.
## Table of contents ## Table of contents