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doc: add a note on usage scope of AliasedBuffer

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Explain usage context and scope of AliasedBuffer API and its
function in the C++ style guide. Provide an example code.

Fixes: https://github.com/nodejs/node/issues/22977

PR-URL: https://github.com/nodejs/node/pull/24724
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
This commit is contained in:
Gireesh Punathil 2018-11-29 19:53:28 +05:30 committed by Rich Trott
parent 841caef9db
commit 447b3907c7
1 changed files with 17 additions and 0 deletions
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CPP_STYLE_GUIDE.md
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@ -21,6 +21,7 @@
* [Use explicit pointer comparisons](#use-explicit-pointer-comparisons) * [Use explicit pointer comparisons](#use-explicit-pointer-comparisons)
* [Ownership and Smart Pointers](#ownership-and-smart-pointers) * [Ownership and Smart Pointers](#ownership-and-smart-pointers)
* [Avoid non-const references](#avoid-non-const-references) * [Avoid non-const references](#avoid-non-const-references)
* [Use AliasedBuffers to manipulate TypedArrays](#use-aliasedbuffers-to-manipulate-typedarrays)
* [Others](#others) * [Others](#others)
* [Type casting](#type-casting) * [Type casting](#type-casting)
* [Using `auto`](#using-auto) * [Using `auto`](#using-auto)
@ -257,6 +258,21 @@ class ExampleClass {
}; };
``` ```
### Use AliasedBuffers to manipulate TypedArrays
When working with typed arrays that involve direct data modification
from C++, use an `AliasedBuffer` when possible. The API abstraction and
the usage scope of `AliasedBuffer` are documented in [aliased_buffer.h][].
```c++
// Create an AliasedBuffer.
AliasedBuffer<uint32_t, v8::Uint32Array> data;
...
// Modify the data through natural operator semantics.
data[0] = 12345;
```
## Others ## Others
### Type casting ### Type casting
@ -382,3 +398,4 @@ even `try` and `catch` **will** break.
[Run Time Type Information]: https://en.wikipedia.org/wiki/Run-time_type_information [Run Time Type Information]: https://en.wikipedia.org/wiki/Run-time_type_information
[cppref_auto_ptr]: https://en.cppreference.com/w/cpp/memory/auto_ptr [cppref_auto_ptr]: https://en.cppreference.com/w/cpp/memory/auto_ptr
[without C++ exception handling]: https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_exceptions.html#intro.using.exception.no [without C++ exception handling]: https://gcc.gnu.org/onlinedocs/libstdc++/manual/using_exceptions.html#intro.using.exception.no
[aliased_buffer.h]: https://github.com/nodejs/node/blob/master/src/aliased_buffer.h#L12