Comments (3)
Might I suggest std::unique_ptr<std::span<T>>
for the C++ API instead?
No UB, no weird code (e.g. reinterpreting casts), perfectly safe, allows directly passing the pointer to C without a full copy, but it would break the "nothing after C++11" restriction that the API currently imposes.
from wasm-c-api.
Do you mean std::span<std::unique_ptr<T>>
? For C++ alone, that would be possible, but I'm afraid it will make it harder to implement the C API on top of it efficiently, which currently relies on being able to reinterpret_cast a C++ API's vec to a C API's vec and vice_versa, which requires controlling the former's representation. That could be avoided, but I think only for the price of extra copying of the span pair.
Anyway, at this point I'd be comfortable requiring C++14 or 17, but it's a bit early to force everybody onto C++20.
from wasm-c-api.
Actually, neither std::span<std::unique_ptr<T>>
, nor std::unique_ptr<std::span<T>>
, make sense in this situation; one would need a union between the classes, i.e., a custom class. Note, unique_ptr<unique_ptr<T>[]>
wouldn't be safe either: if std::unique_ptr
were implemented in any stdlib as a struct larger than just the single pointer, then reinterpretation could be UB (not 100% sure, but if it's not, the results would be nonsense anyway).
As for updating the minimum language standard in use, I'd suggest at least checking out what versions implementations are currently using for their own Wasm VMs and other code. If no Wasm VM is written <= C++11, it would be wierd for the API to be in <= C++11.
(and yes, as having seen many libraries' reactions to C++20, I agree that it may be too new to push)
But, considering the lack of attention that this issue has been given, maybe the vec type does an okay job after all?
from wasm-c-api.
Related Issues (20)
- Embedding multiple engines implementing wasm C API HOT 3
- undefined reference to `wasm::vec<char>::free_data()'
- Syslog HOT 2
- Custom Sections API HOT 4
- WASM proposals supporting in Wasm C API HOT 1
- API to Terminate Execution for a wasm::Store
- Expectations for serialize/deserialize HOT 4
- make error:error: use of undeclared identifier 'errc' struct is_error_condition_enum<errc> HOT 1
- docker build fails in C++ Multi test HOT 2
- AddressSanitizer: allocation-size-too-big HOT 3
- Access of v8 isolate possible? HOT 1
- Deprecate wasm-c-api on big-endian hosts HOT 12
- Support import globals callback HOT 6
- posix shared memory with wamr
- Metering API
- `vec<T>::make_nt` may not be so helpful HOT 1
- Please tag when used in wabt
- memory64 support
- Type constructors should have a `wasm_engine_t*` parameter HOT 10
- How to import a native func to "env"? HOT 4
Recommend Projects
-
React
A declarative, efficient, and flexible JavaScript library for building user interfaces.
-
Vue.js
🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.
-
Typescript
TypeScript is a superset of JavaScript that compiles to clean JavaScript output.
-
TensorFlow
An Open Source Machine Learning Framework for Everyone
-
Django
The Web framework for perfectionists with deadlines.
-
Laravel
A PHP framework for web artisans
-
D3
Bring data to life with SVG, Canvas and HTML. 📊📈🎉
-
Recommend Topics
-
javascript
JavaScript (JS) is a lightweight interpreted programming language with first-class functions.
-
web
Some thing interesting about web. New door for the world.
-
server
A server is a program made to process requests and deliver data to clients.
-
Machine learning
Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.
-
Visualization
Some thing interesting about visualization, use data art
-
Game
Some thing interesting about game, make everyone happy.
Recommend Org
-
Facebook
We are working to build community through open source technology. NB: members must have two-factor auth.
-
Microsoft
Open source projects and samples from Microsoft.
-
Google
Google ❤️ Open Source for everyone.
-
Alibaba
Alibaba Open Source for everyone
-
D3
Data-Driven Documents codes.
-
Tencent
China tencent open source team.
from wasm-c-api.