Binding Lua to C. To make the most of CES you will need to bind you data members and method from C to Lua. Thanks to bindings you will be able to retrieve data from C in your CES file. For example, if you are developping a RPG with procedural dungeons you may need to generate Level files (let say in XML). You will need at least one C interface to bind in Lua that you can call from Lua and pass your object back into your C application. The above assumes you're using SWIG to generate this method, which will bind C arguments to Lua stack positions (as specified by pos). Dig into the SWIG Lua binding implementation; there's a lot there that you.

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Using Swig To Bind C++ To Luan
Using Swig To Bind C++ To Luang

This code helps to bind the C object into a Lua object with the alias ‘CppObject. Lets dissect the code line by line. This line defines the new Lua Usertype and also defines the member function ‘TestFunction1’ to specify that the class contains this function. In this line, we create a new object ‘cppObj’ of type ‘CppObject’.

Using the SWIG (Simple Wrapper and Interface Generator) tool, C functions and classes can be bound to the Lua api allowing them to be called within a Lua script. This is useful in separating the upper level logic from the lower level application and is utilized in numerous video games and applications. I am implementing the createTimer binding to C with SWIG, so my C function is int createTimer(char.funcName, unsigned int periodInMs) Question 1) Having to make the Callback function name a string, looks a bit wrong to me, I would have preferred to just pass it as a Lua function, but I couldnt figure out a way to do that with SWIG.

Lately I’ve been playing around with writing C bindings for a C++ library. Your first thought might be, “Why would you bind a C++ to C?” Those of you who have ever had to do bindings to other languages may already know the answer. In general, it’s much easier to bind C to another language than it is to bind C++ directly. Another, albeit less likely, reason might be because a client wants a C interface instead.

You may be asking your self at this point, “Why not using SWIG or (insert specific language binding tools/libraries here)?” and that’s an extremely valid question. In general, I’d say, use SWIG, unless you’re unhappy with the bindings they generate. As a specific example for C++ to Lua binding, OOLua did a benchmark of OOLua and SWIG (as well as Luabind) in which OOLua typically did better then the other two bindings as far as execution speed. That’s not to say that in real world cases you’re going to see considerable improvements over SWIG by writing your own bindings (or using something else), but it could be a reason to consider it.

The reason I’ve personally chosen to write my own is to have complete control of the resulting binding(s). With Go in particular, I don’t care for the resulting API.

Scan spyware 3.8 crack. There are some things you’ll want to consider when taking this route. First and foremost. You’ll have to explicitly handle each binding you may do. A change to the original API may result in breakage and the need to refactor several bindings (depending on how many you want to support.) On the other hand, SWIG allows your to fairly easily only have to change things in one location and potentially have support for as many languages as SWIG supports (though, you’re likely to only support a few, or perhaps even just one.)

Next, it’s possible your bindings may actually be slower than one’s generated by SWIG. As SWIG is a mature project, a lot of work has been put into SWIG to make it efficient and also portable. While this isn’t exactly a killer, some care must be taken to make sure your bindings don’t become a jumbled mess of non-portable/slow code.

Finally, it’s going to take considerably more time to write and maintain your own bindings in comparison to SWIG. The main reason is that SWIG obviously does 95% of the work for you with the last 5% being tweaks you may want or need. With your own bindings, you not only have to carefuly plan out your own API’s (for C as well as any additional bindings), but any refactoring has to be done in more places. SWIG is a clear winner in this case (as mentioned before.)

Now, that’s not to say SWIG is without faults. One instance in particular (for Go) the SWIG documentation has this to say:

Often the APIs generated by swig are not very natural in Go, especially if there are output arguments.

As well as:

For classes, since swig generates an interface, you can add additional methods by defining another interface that includes the swig-generated interface. Of course, if you have to rewrite most of the methods, instead of just a few, then you might as well define your own struct that includes the swig-wrapped object, instead of adding methods to the swig-generated object. This only works if your wrappers do not need to import other go modules. There is at present no way to insert import statements in the correct place in swig-generated Go. If you need to do that, you must put your Go code in a separate file.

Basically this means if the resulting binding is very unnatural, extend or wrap the wrapper. Also, in this case, you’re starting to need special logic on a per-language binding basis. For many, this is still a cheaper situation for large code bases. For smaller code bases that need a lot of this added code in the SWIG interface file could argue there’s less reason to use SWIG.

All of that aside, you may still decide to write your own C bindings. The process is actually quite straight forward in many cases. Though, there are some things to keep in mind. For instance, templates cannot be used in C bindings. You can however bind specific types instances templates. The reasons should be obvious to anyone who understands the various stages of the C++ compiler. In short, templates are only evaluated at compile time and only for instances. Bindings in general require that type information to be compiled into the binary to be referenced later. This isn’t unique to writing your own C bindings, SWIG, OOLua, and others will all require these types to be declared ahead of time. As an example, you can’t bind std::vector without first knowing the type. You’re free to bind std::vector, std::vector<char *>, std::vector, etc. These will all resolve to a specific type, and thus can be bound. You can’t, however, expect std::vector to work if the template was never compiled for that type.

Using Swig To Bind C++ To Luan

What I’ll cover in the rest of the post are some of the basics. A full example with source is included at the end of the post that you can download and examine. It’s thoroughly commented and is actually quite straight forward. The very first thing you should know, the C bindings are written in C++, but provide C linkage. If you don’t already, is that C++ has built in support for generating C linkage with:

You can either put this in front of a function or type or enclose multiple statements with curly braces. Now, because you’re still in C++, you can leverage a lot of the library without having to drop to C-ism’s unless needed. For instance, when creating new C structs, you may use new/delete instead of malloc/free. Inside the C binding functions you may also use std::strings, std::vectors, and other C++ containers if convenient. Keep in mind you’ll really want to do as little in the C bind