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Add note about RVO in cpp.md #2128

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Dec 6, 2021
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Add note about RVO in cpp.md #2128

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5 changes: 5 additions & 0 deletions book/src/cpp.md
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Expand Up @@ -71,3 +71,8 @@ cannot translate into Rust:
generate undefined behaviour. See
[the tracking issue for exceptions](https://github.com/rust-lang/rust-bindgen/issues/1208)
for more details.

* Return value optimization. C++ compilers will in certain circumstances optimize functions
returning a struct type value to instead take an extra hidden argument that refers
to the return value struct. `bindgen` cannot necessarily know about this optimization and
thus at present `bindgen`-interfaces for these kinds of functions are invalid.