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src: add AliasedStruct utility

Rodrigo Muino Tomonari requested to merge github/fork/jasnell/aliased-struct into master

For http2 (and eventually QUIC) we have a struct that is backed by a v8::BackingStore and exposed to the JavaScript side as an ArrayBuffer and TypedArray. This is similar to AliasedBuffer except that it is fronted by a struct on the C++ side.

struct foo {
  uint32_t ex1;
  uint32_t ex2;
};

AliasedStruct<foo> foo_;

foo_->ex1 = 1;
foo_->ex2 = 2;

foo_.GetArrayBuffer();

Signed-off-by: James M Snell jasnell@gmail.com

/cc @addaleax

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • commit message follows commit guidelines

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