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Move note about using cppcoro to the top of the coroutines section.

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Anthony Calandra
2024-10-12 22:49:12 -04:00
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CPP20.md
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@@ -38,6 +38,9 @@ C++20 includes the following new library features:
## C++20 Language Features
### Coroutines
> **Note:** While these examples illustrate how to use coroutines at a basic level, there is lots more going on when the code is compiled. These examples are not meant to be complete coverage of C++20's coroutines. Since the `generator` and `task` classes are not provided by the standard library yet, I used the cppcoro library to compile these examples.
_Coroutines_ are special functions that can have their execution suspended and resumed. To define a coroutine, the `co_return`, `co_await`, or `co_yield` keywords must be present in the function's body. C++20's coroutines are stackless; unless optimized out by the compiler, their state is allocated on the heap.
An example of a coroutine is a _generator_ function, which yields (i.e. generates) a value at each invocation:
@@ -83,8 +86,6 @@ auto meaning_of_life = calculate_meaning_of_life();
co_await meaning_of_life; // == 42
```
**Note:** While these examples illustrate how to use coroutines at a basic level, there is lots more going on when the code is compiled. These examples are not meant to be complete coverage of C++20's coroutines. Since the `generator` and `task` classes are not provided by the standard library yet, I used the cppcoro library to compile these examples.
### Concepts
_Concepts_ are named compile-time predicates which constrain types. They take the following form:
```