sml
Magic Enum C++
sml | Magic Enum C++ | |
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23 | 44 | |
1,081 | 4,424 | |
2.3% | - | |
6.8 | 8.1 | |
about 1 month ago | 1 day ago | |
C++ | C++ | |
Boost Software License 1.0 | MIT License |
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sml
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Sharing Saturday #496
Anyway the need is not complicated, I need both entry and exit functions from every state, optionally allowing these functions to be coroutines (that's special sauce but for later), and an explicit state transition table which also have a way to say that a state can be accessed at any point. Also allow states to be state machines, optional FSM hierarchies. If you ignore the coroutine stuff it's pretty standard features these days, except that - Boost.MSM is quite archaic now (it was so novel when it was first released...) although it allows most of the features I talked about, I just think it will complicate my code unneecessarilly; - Boost-Ext.SML (not Boost) is almost perfect except it doesnt have entry/exit functions on states for some reason. Also last time we (as in in livestream) tried it in prototypes it didnt compile on msvc XD - Boost-Ext.SML2 is even better but still doesnt have entry/exit functions although it's in the plans.
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State machines with C++20 coroutines and Asio/Boost Async
Hello all. Being a huge fan of state machine and coroutines, I have been browsing around for examples of what other people do combine these two. I have been using boost-ext/sml for quite many projects and are quite happy about that. But when transitioning to code that relies on coroutines, I would like to write entry/exit/actions/guard methods that uses coroutines and where I can co_await on awaitables from Asio and more recently "Boost Async".
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Looking for well written, modern C++ (17/20) example projects for microcontrollers
boost-ext/sml: quite modern way of doing state machines using a DSL
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When Debug Symbols Get Large
I recently was troubleshooting a crash that backtraced through the boost::sml library [0]. The crash didn't actually have anything to do with the library, but it was used as the core event loop.
The backtrace -- as in, just the output from running `bt` in GDB -- was over a thousand wrapped lines long. There were ~5 stack frames that took up 200 lines of console each to print just the function name. That product's debug builds recently hit the 2GB line, which is enough that old versions of binutils complain.
I don't know what the solution is. There's some really neat stuff you can do with template metaprogramming, and in stripped release builds it compiles down extremely tiny. Plus the code is very clean to read. But it does feel like there isn't any kind of central vision for the C++ debugging experience, and bad interactions between highly-complex modern C++ typing, the compiler, and the debugger are probably only going to get worse unless somebody (the ISO committee? Vendors?) thinks really hard about debugging support.
[0]: https://github.com/boost-ext/sml
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[Boost::MSM] Huge Memory Usage Issue During Compilation
I'm a big fan of MSM but what you're experiencing is pretty normal for template-heavy libraries built on C++03 machinery (emulation of variadic templates is the usual culprit). It's probably not the answer you're hoping for, but the real solution is to switch to a library with more modern foundations. (I've been happily using [Boost::ext].SML for a few years but I'm reluctant to strongly recommend anything in particular since I haven't re-explored the problem space since I found it.)
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State machine suggestion?
The Boost one that you mention, seems to be one that it's kinda old. A "successor" of sorts is Boost SML. I've not used it yet, but certainly the first impressions are very good.
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Specifications for an open source finite state machine library
Or Boost.Sml
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Facts about State Machines
At our company, we rely a lot on https://github.com/boost-ext/sml
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What are some cool modern libraries you enjoy using?
I'm a big fan of boost::sml for representing state machines.
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[C++20] New way of meta-programming?
https://github.com/boost-ext/sml (State Machine DSL and backend for perfomance)
Magic Enum C++
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What C++ library do you wish existed but hasn’t been created yet?
I'm not sure this is quite what you're asking for, but this library has been super helpful to me in the past : https://github.com/Neargye/magic_enum
- Usable Magic Enums for C++
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Fully Permissive License C++ Logger For Embedded System
Also, a shoutout to Magic Enum: https://github.com/Neargye/magic_enum
- Favorite Ways of Stringifying Enums
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enum_name (yet another enum to/from string conversion utility >=C++11)
What does this have to offer over magic_enum?
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quill v2.7.0 released - Asynchronous Low Latency C++ Logging Library
But it's a hack, and I prefer not to use hacks in production, because of their significant limitations:
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Enums print numbers instead of words
You can either write a to string(view) function for your enum or use https://github.com/Neargye/magic_enum
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Enums with methods
Why reinvent the wheel? magic_enum
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Error: Boost bimap can't convert const CompatibleKey to Key&
Also if you want to convert enum members to string representation I suggest you just use magic_enum instead, much smaller dependency.
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Macro to write enum and converter from and to string
Magic Enum provides that.
What are some alternatives?
hsm - Finite state machine library based on the boost hana meta programming library. It follows the principles of the boost msm and boost sml libraries, but tries to reduce own complex meta programming code to a minimum.
Nameof C++ - Nameof operator for modern C++, simply obtain the name of a variable, type, function, macro, and enum
stm32plus - The C++ library for the STM32 F0, F100, F103, F107 and F4 microcontrollers
Protobuf - Protocol Buffers - Google's data interchange format
hana - Your standard library for metaprogramming
cereal - A C++11 library for serialization
HFSM2 - High-Performance Hierarchical Finite State Machine Framework
FlatBuffers - FlatBuffers: Memory Efficient Serialization Library
Experimental Boost.DI - C++14 Dependency Injection Library
Boost.Serialization - Boost.org serialization module
Boost.Beast - HTTP and WebSocket built on Boost.Asio in C++11
pfr - std::tuple like methods for user defined types without any macro or boilerplate code