magic_get
circle
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magic_get | circle | |
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9 | 54 | |
193 | 2,165 | |
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8.2 | 5.0 | |
5 months ago | 6 months ago | |
C++ | C++ | |
Boost Software License 1.0 | - |
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magic_get
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What is a good way to iterate through struct contents?
Maybe this: https://github.com/apolukhin/magic_get
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What information about a type/class can we get?
You can access non-static member variables with structured bindings. See for instance magic_get/boostPfr https://github.com/apolukhin/magic_get. Structured bindings will only bind to the accessible members (not private). Magic get works by by finding the number of member variables, converting the struct to a tuple (with a function that is specialized for the number of fields), and finally accessing the members through the tuple (supporting indexing and iteration). It does not grant access to the member names, but it is sufficient for some reflection.
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A way to determine the number of elements in a structured binding
Libraries like magic_get expose the members of an aggregate class/struct to allow writing generic code for things like pretty printing and serialization without anything special done to the class itself. They often rely on structured bindings for the decomposition (*), but find the number of elements via SFINAE on aggregate initialization, as an aggregate type can be initialized only from as many objects as it has members. It would be nicer if you could SFINAE directly on the structured binding itself, as then the type could have user-defined constructors (which aggregates can't). Unfortunately, this is not possible since structured binding is a statement and not an expression. Unless you're using Clang, where the GNU statement expressions extension allows you to do SFINAE on them, as in here.
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Minimum viable declarative GUI in C++
No RTTI required, but the types are required to be aggregates (no constructors defined). It's possible to count the number of members using SFINAE by trying different numbers of inputs to the aggregate constructor using a type that's castable to anything, and then enumerate the members with a similar trick (or use structured binding to pull them out directly). I think he uses magic_get which is the most popular library for this trick.
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Call function on each member of struct using preprocessor
take a look at magic_get to get access to all struct members. No idea what your plan is with foo and the preprocessor though.
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Serdepp 0.1.2 Released
Neat! Have you considered using magic_get?
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Getting information about classes, methods and variables in C++?
It is possible with some hacks https://github.com/apolukhin/magic_get
- Struct bulk operations - Reflection? Code gen?
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Reflecting Over Members of an Aggregate
I actually reference it near the bottom of the article under its original name, magic_get! I was disappointed to discover that this library did it a similar way first before me while researching 😅
circle
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How difficult would it be to make a c++ compiler
Sean Baxter created a front end c++ compiler by himself, using llvm for the back end and the gcc or clang stl. I think it took him a couple of years. https://www.circle-lang.org/. Before this happened I heard a couple of different people claiming that there would never be a totally new compiler as it was too much work.
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Toward a TypeScript for C++"
The real Typescript for C++ is Circle.
https://www.circle-lang.org/
Just like Typescript to JavaScript, the syntax is an evolution of what already exists, not a completely different syntax.
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A Metaobject Protocol for C++ [pdf]
Sean Baxter's Circle [1] is arguably the spiritual successor to MOP.
[1] https://www.circle-lang.org/
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Circle Evolves C++ [video]
Context: https://github.com/seanbaxter/circle/blob/master/new-circle/...
Note that Circle is not an F/OSS compiler as someone pointed out before. This however doesn't make Circle less relevant, because it is actually a testament to show that C++ could have been much better without the claimed breakage. If Circle does provide a number of desirable features and its compiler can be built by a single person, then why shouldn't the committee do the same?
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My (Herb Sutter's) C++ Now 2023 talk is online: “A TypeScript for C++”
From all wannabe C++ replacements candidates, the only language that is really a TypeScript for C++, is Circle.
For whatever reason, Herb Sutter decided to ignore this language on the presentation.
https://www.circle-lang.org/
This is the only one with the syntax based on C++, incrementally changing the features via #pragma settings.
"Circle Fixes Defects, Makes C++ Language Safer & More Productive"
https://www.youtube.com/watch?v=x7fxeNqSK2k
"Circle Evolves C++"
https://www.youtube.com/watch?v=P1ZDOGDMNLM
- File for Divorce from LLVM
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Making C++ Safe Without Borrow Checking, Reference Counting, or Tracing GC
The second someone makes a successor language that seamlessly/directly interops with C++ _AND_ has the level of build/IDE tooling that C++/Rust have, I'm on board.
The closest thing right now is Sean Baxter's "Circle" compiler in "Carbon" mode IMO:
https://github.com/seanbaxter/circle/blob/master/new-circle/...
Unfortunately, Circle is closed-source and there's no LSP or other tooling to make the authoring experience nice.
- Circle-lang: A feasible, simple, and immediate way for C++ to break out of the rut it's been in. Surprised more people aren't talking about it.
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Recurrence-expression is a programmable superset of fold-expression
I read through the whole of https://github.com/seanbaxter/circle/blob/master/new-circle/README.md and man, I'm drooling. Awesome work, kudos.
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Dropping support for old C++ standards
Have a look at Circle from Sean Baxter [0]. It's pretty impressive.
[0]: https://github.com/seanbaxter/circle/blob/master/new-circle/...
What are some alternatives?
pfr - std::tuple like methods for user defined types without any macro or boilerplate code
raspberry-pi-os - Learning operating system development using Linux kernel and Raspberry Pi
cling - The cling C++ interpreter
dts2hx - Converts TypeScript definition files (d.ts) to haxe externs (.hx) via the TypeScript compiler API
cppreference-doc - C++ standard library reference
mdspan - Reference implementation of mdspan targeting C++23
serdepp - c++ serialize and deserialize adaptor library like rust serde.rs
papers - ISO/IEC JTC1 SC22 WG21 paper scheduling and management
CppCoreGuidelines - The C++ Core Guidelines are a set of tried-and-true guidelines, rules, and best practices about coding in C++
meta
hypervisor - lightweight hypervisor SDK written in C++ with support for Windows, Linux and UEFI
jakt - The Jakt Programming Language