lua get name of calling function

This keyword therefore controls whether call-by-reference or call-by-value is applied. You can use debug.getinfo(2, "f").func to get the function reference (assuming you are calling from the function you want to get a reference to): Thanks for contributing an answer to Stack Overflow! While still largely relevant for later versions, there are some differences.The fourth edition targets Lua 5.3 and is available at Amazon and other bookstores.By buying the book, you also help to support the Lua project. But this is not yet the maximum speed, since the current implementation doesnt use LuaJIT FFI and tail calls yet. Functions help in reducing the code redundancy and at the same time they make the code much more readable and less error prone. To call a method, you simply need to pass the required parameters along with the method name and if the method returns a value, then you can store the returned value. Lua tries to find a name for a function by looking for a global Speed up strlen using SWAR in x86-64 assembly, Difference between letting yeast dough rise cold and slowly or warm and quickly. A called function performs the defined task and when its return statement is executed or when its function's end is reached, it returns program control back to the main program. Moreover, func has the function that is active at But now have a look at this example in Oberon: If procedure increment() obeys call-by-reference then the expression x[index()] is only evaluated once when the actual parameter is handed over to the formal parameter. rev2023.6.5.43475. All Rights Reserved. To learn more, see our tips on writing great answers. If n is larger than the number of active functions in the stack, in Simula 67. Affordable solution to train a team and make them project ready. Can you have more than 1 panache point at a time? Actually my currently preferred implementation of call-by-reference in Lua is a specialization of the call-by-name implementation. Sorry, I've edited my post to try to explain myself a little more clearly with formatted code examples. The first step is to define the function. Learn more. Like named functions, anonymous functions need to start and end with the function and end keywords, but you don't need the local keyword to indicate local scope because they always have local scope. Referencing to the current unidentified function in Lua. Add the "luaavg.cpp" file to your project. The arguments you pass to :Invoke() forward to the callback, and the return value from the callback function returns to the caller of :Invoke(). On the one hand Lua treats functions as first-class values; functions can be anonymously declared in place. I personally find LuaJIT attractive as a backend because it is available on all platforms relevant to me (including embedded), includes a garbage collector, and it is relatively easy to implement dynamically loadable modules and source level debuggers. In Lua, we declare functions with the help of the function keyword and then, we can invoke(call) the functions just by writing a pair of parentheses followed by the functions name. To implement call-by-reference in Lua we have two possibilities: we can either use multiple return values or an extension of the thunk concept described above. The retrieving call needs no actual parameters; set and val are both nil in this case which activates the else part of the if condition of the thunk. here). The formal parameters behave like other local variables inside the function and are created upon entry into the function and destroyed upon exit. In Lua, is it possible to know which function has called the current function. All objects in Roblox descend from Instance and have commonly used methods including Instance:Destroy(), Instance:Clone(), and Instance:FindFirstChild(). Should I trust my own thoughts when studying philosophy? I have also included the code for my attempt at that. function lua Share Improve this question Follow asked May 31, 2012 at 18:12 To create a method in a table, use the name of the method as the key and the method function as the value. when you have Vim mapped to always print two? Learn more, table.unpack() function in Lua programming, string.byte() function in Lua programming, string.char() function in Lua programming, string.format() function in Lua programming, string.gsub() function in Lua programming, string.lower() function in Lua programming, string.upper() function in Lua programming. However, Lua was first released in 1993 and is still a C library. When you query an active function, In the following example, the callback for the global delay() function and the event handler for the Players.PlayerAdded event are both anonymous functions. Lets consider one more example, where we will calculate the n-th Fibonacci number. In the example above, we should at least check each argument to make sure that it is a number. How to divide the contour in three parts with the same arclength? I have bad news, my friend. The body of the function executes when you call the function. As it turned out, most of Oberons constructs can be translated directly into corresponding Lua constructs. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. The reference to x in the body of the thunk function continues to reference the local variable x in the scope where the thunk was defined. Note that i is initialized to 0 here because Lua in contrast to Oberon uses one-based array indices. I know I can use debug.getinfo(1, "n").name to get the calling function's name, but I would like to get a reference to that function pointer itself. Functions are a Luau data type, so you can store them in tables with other data. Arguments An argument is like a placeholder. I want to draw a 3-hyperlink (hyperedge with four nodes) as shown below? Still further advantages are to be expected, if one generates directly LuaJIT bytecode and thus is not limited by the syntax and semantics of the source code level. To use a method, you will have to call that function to perform the defined task. The primary difference is the expression used in the thunk function. Functions can both carry out a specific task (what is sometimes called procedure or subroutine in other languages) or compute and return values. How can explorers determine whether strings of alien text is meaningful or just nonsense? This would allow us to reuse the upvalue mechanism for VAR parameters. This website is using a security service to protect itself from online attacks. Cameron demonstrates how to use a thunk procedure to evaluate the expression and then return the address of the designated variable. Thanks for contributing an answer to Stack Overflow! In this tutorial we will create a function in C++, tell the Lua interpreter about it, and finally call it from Lua and use the results. 2023 Roblox Corporation. What happens here is simple, you only set a metatable to the PrintVariable variable and add the __index metamethod that is called when the table is forced to search for a value in its index, thanks to this functionality you can achieve what you see in the example. LuaJIT (see https://luajit.org/) is an alternative implementation of Lua with an integrated, state-of-the-art just-in-time (JIT) compiler. When a function is invoked, you pass a value to the argument. Where to store IPFS hash other than infura.io without paying. While declaring a function is essential, it is only half of the battle. With tail-call optimization, the simpler version might give incorrect results if, Building a safer community: Announcing our new Code of Conduct, Balancing a PhD program with a startup career (Ep. My father is ill and booked a flight to see him - can I travel on my other passport? The compiler doesnt do optimizations yet, but even though I got another significant speedup. In consequence the left hand side of the assignment would designate a different array element than the right hand side. Find limit using generalized binomial theorem. Not robustly. Thats why I did not proceed with this solution. What does "Welcome to SeaWorld, kid!" Arguments are optional; that is, a method may contain no argument. As a general rule, when a C function is . according to the following table: The following function illustrates the use of debug.getinfo. getinfo has an optional second parameter that Now lets see how call-by-reference is implemented in Oberon: As you can see here the procedure increment() has modified the value of the variable x, which was passed as a reference to the procedure call. Only very few scripting languages support call-by-reference with scalar variables at all. For example, BindableFunction.OnInvoke is a callback of BindableFunction. For such functions, only the fields what, name, and namewhat are relevant. On the menu click Project, luaavg Properties. Lua keeps debug information in a form that Find limit using generalized binomial theorem. It was introduced with Algol 60 and also available e.g. The code shown below will not work in older versions of Lua. Is something like this possible? Playing a game as it's downloading, how do they do it? You can define a variable to accept the return value or use the return value in place of a variable. end function entity_spawn (name) args = {} call ( "ent_" .. name, args) -- ERROR end entity_spawn ("wall") result is: Functions are blocks of code that you can execute multiple times on command. The feature enables you to create gradients in just a few steps and now includes new on-canvas controls which help you have precise controls over many aspects of the gradient in real-time. It prints a primitive traceback of the active stack. The thunk concept has to take care of how many times selector expressions are evaluated as well, but in contrast to the return value based solution no local temporary variables are needed and the code becomes less complicated (however, at the expense of performance as will be discussed later). This avoids calls of FNEW in the trace. Find centralized, trusted content and collaborate around the technologies you use most. I still see further potential for optimization, even if this performance is already in the same range as the expectations described at the beginning of this article. What maths knowledge is required for a lab-based (molecular and cell biology) PhD? But if increment() were call-by-name (which is not supported by Oberon and just a mental game here), then y would be replaced all over in the procedure body by the expression x[index()] which therefore was called twice. (I realize that I can get the module name by inserting local module_name, _ = . The updated version of the translator is on Github. the syntax of Lua has been strongly influenced by Modula? I hope that future and new visitors will find this helpful. Asking for help, clarification, or responding to other answers. If you have existing C++ functions that you would like to call from Lua, wrappers can easily be created to meet this requirement. For the interested readers I would like to report here about the progress and findings since publication of this article on Oct. 10. selects what information to get. Is there a canon meaning to the Jawa expression "Utinni!"? The OP cannot recover the variable names he wants, however it is not true that "local variable names cease to exist". that might be possible if you attempt to walk up the stack to try to figure out what locals are in scope with matching values to what was passed to the called function. Parameters are variables that you make available to the function and are only used in the function's scope. function PrintVariable (name) -- default to showing the global with that name, if any local value = _G [name] -- see if we can find a local in the caller's scope with that name for i=1,math.huge do local localname, localvalue = debug.getlocal (2,i,1) if not localname then break -- no more locals to check elseif localname == name then value . To call a function, type its name followed by parentheses. A function is a group of statements that together perform a task. When you call a method, use the colon notation (:) instead of dot notation (.) edit for lhf. The call-by-name mechanism is not very much known and in use today. How do I Derive a Mathematical Formula to calculate the number of eggs stacked on a crate? And then came LuaJIT. Living room light switches do not work during warm/hot weather. Now how can we achieve the same effect in Lua? The more VAR parameters or recursion the procedure has the slower the generated code runs. This doesn't mean it's bad, but writing proper bindings to enhance usage in a modern C++ project would still be nice. Find centralized, trusted content and collaborate around the technologies you use most. When you call debug.getinfo(n) for some number n, Here is a Lua example: --. Thanks. Thanks for contributing an answer to Stack Overflow! Your panic function can avoid this exit by never returning (e.g., doing a long jump to your own recovery point outside Lua). I would expect the multiple return value based solution to run faster from the outset because local variables in Lua are directly addressable by numeric index (in contrast to the hash lookups for tables) and no additional function calls are required. currentline, You can assign a function, known as an event handler, to execute when an event fires. The average of the arguments is pushed onto the stack with lua_pushnumber(). MTG: Who is responsible for applying triggered ability effects, and what is the limit in time to claim that effect? In the meantime I was able to carry out further analyses with the tools provided by LuaJIT. How you divide up your code among different functions is up to you, but logically the division usually unique, is so each function performs a specific task. I want to draw a 3-hyperlink (hyperedge with four nodes) as shown below? Save this as avg.lua. I have decided to try my luck with Oberon, not because I would consider Oberon to be the best of all programming languages, but because it is sufficiently simple and I had already written an Oberon transpiler in C++. What I'm doing now is passing the variable name in quotes and using loadstring to get the value but I would like to just pass the variable directly without the extra unnecessary quotes(which I thought debug.getlocal did but it ends up returning the value instead of the name). Function Body The method body contains a collection of statements that define what the method does. you get data about the function active at that stack level. The solution is to use a table instead of a function but make the table callable using a metatable and the __call event (see section 2.8 in the Lua reference manual for more information about metatables). 'c' means call your hook function any time a function is called in lua, 'r' means call your hook function every time a function returns in lua, and 'l' means call your hook function whenever lua processes a new line of code. Yes, you could walk up the stack with debug.getint() looking for the variable that was passed in, but you may find several references. You can create functions without names, known as anonymous functions, to use as callbacks and event handlers. Now running my.lua.app.caller should allow it to get its own module name, my.lua.app.caller.Is this doable in Lua? Why doesnt SpaceX sell Raptor engines commercially? In contrast to my first approach it is now possible to do several passes and to rewrite the AST. The change to y has no effect on x. To call a function, type the name it was defined with and add . Another possible solution is add this facility your self. Copy the file from "C:\Program Files\lua5.1\lib\dll" to your new Visual C++ project's folder. A function is known with various names like a method or a sub-routine or a procedure etc. Finally, the function returns 2, indicating two return values have been pushed to the stack. Does the policy change for AI-generated content affect users who (want to) Why are mountain bike tires rated for so much lower pressure than road bikes? It isn't generic, but it is simple. The format of this parameter is a string, Here is the description of call-by-name from the Revised Report on the Algorithmic Language Algol 60: Any formal parameter not quoted in the value list is replaced, throughout the procedure body, by the corresponding actual parameter, after enclosing this latter in parentheses wherever syntactically possible. Programs should avoid it. 576), We are graduating the updated button styling for vote arrows. Lua does not have much data about it. If I've put the notes correctly in the first piano roll image, why does it not sound correct? Performance & security by Cloudflare. Would the presence of superhumans necessarily lead to giving them authority? To learn more, see our tips on writing great answers. But implementing the translator was considerably more work. When foo is a C function, Lua does not have much data about it. rev2023.6.5.43475. You should now be able to set up Lua on your computer, call Lua functions from C++, and call C++ functions from Lua. Why are kiloohm resistors more used in op-amp circuits? In the definition of the method, the self parameter refers to the method's parent table. How can a function get the module name of the caller? 5 - Functions. For the sake of completeness I would like to mention that I also tried an approach directly on bytecode level. This first edition was written for Lua 5.0. When you call a method using colon notation, you pass the table itself as the first argument. The block of code, or "body", of the function. The Gradients feature has been significantly improved, and the workflow has been expedited. In the first case, we use a function call as a statement; in the second case, we use it as an . to see how it was called. rev2023.6.5.43475. described in the book Algol-60 Implementation from 1964. Remove hot-spots from picture without touching edges. Does the debug library have such functionality? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Now back to the question about performance. But for the present Oberon to Lua source code transpiler I prefer the thunk based approach because the resulting code is closer to the original and easier to comprehend and check. call-by-reference), on which I will concentrate in the rest of this article. By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. Lua has two features that make an elegant solution possible. Im waiting for my US passport (am a dual citizen). You can divide up your code into separate functions. Cloudflare Ray ID: 7d2899b80b813681 Why are mountain bike tires rated for so much lower pressure than road bikes? Would the presence of superhumans necessarily lead to giving them authority? We therefore still have to find a solution for the case where the variable is an array element or a record field. Not, if you really want to do this without the quotes, you could check the caller's locals for variables that have a supplied value, but that's occasionally going to give you the wrong variable name if there is more than one variable in the caller's scope with a given value. The generated code now runs only two times slower on median, average and geometric mean than the code compiled with OBNC. But unfortunately this would only work in the PUC Lua implementation. Connect and share knowledge within a single location that is structured and easy to search. Why do BK computers have unusual representations of $ and ^, Anchor build errors due to 'getrandom' and 'letelse'. You can't say PrintVariable(MyVariable), because Lua gives you no way of determining which variable (if any; a constant could have been used) was used to pass an argument to your function. How call-by-name can be implemented in an Algol 60 compiler is e.g. how to get caller of function within a function in lua? Is this doable in Lua? They expect the object itself (self) as the first argument. Copyright TUTORIALS POINT (INDIA) PRIVATE LIMITED. So we have to add these somehow to the closure which is used as a thunk. What should be the criteria of convergence over ENCUT? By clicking Post Your Answer, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct. For more information, see Events. function doing the call. user does not need. Then the sum of the arguments is pushed onto the stack. For example . Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. ahh, gotcha. how to get caller of function within a function in lua? This makes LuaJIT even ~1.3 times faster than the well-known JavaScript V8 engine when comparing the geometric mean values from this source (also confirmed by other sources, e.g. Its original bytecode interpreter is not only extremely lean, but was also one of the fastest scripting language implementations for many years. This means if we just pass a local scalar variable by name to a procedure the effect is essentially the same as with call-by-reference. Is there a canon meaning to the Jawa expression "Utinni!"? What does "Welcome to SeaWorld, kid!" We had to modify the body of increment() because y is now a function; note that the original assignment is replaced by two calls of the thunk function, one to retreive the value, and the other to set the value. Calling a function of a module by using its name (a string), Lua: Get the literal name of the parameter. Lua is a very good way to extend your C/C++ application. With that said, here's how you'd do that: Now you can say PrintVariable(MyVariable), but if there happened to be another variable in the caller's scope with the value 4, and it occurred before MyVariable, it's that variable name that will be printed. Lua (see https://www.lua.org/) is an amazingly flexible scripting language. In this section I have demonstrated how to implement call-by-name in Lua. In Lua a function can return multiple values at once. Does the policy change for AI-generated content affect users who (want to) Lua: Get the literal name of the parameter, lua - get the list of parameter names of a function, from outside the function, Specifying function argument names in lua. Here is a Lua example: As you can see the parameter y receives a copy of the value of variable x when increment() is called. Making statements based on opinion; back them up with references or personal experience. rev2023.6.5.43475. debug.sethook can handle 3 different characters in the second parameter so you can let it know when to notify you. By using this website, you agree with our Cookies Policy. Meanwhile I was able to implement a new semantic analyzer and abstract syntax tree (AST) generator with a visitor based processing pipeline. Beside "Additional Dependencies" type lua5.1.lib. This is quite an old topic and I apologize for bringing it back to life. Connect and share knowledge within a single location that is structured and easy to search. For example, print() is a variadic function. I will also talk a little about error checking in Lua programs. Unexpected low characteristic impedance using the JLCPCB impedance calculator. You can set a named or anonymous function to it, and you can call (invoke) that function by calling the :Invoke() method on the callback. We thus could reuse the same function prototype and add CLOSURE and the corresponding local variable reference for each unique set of actual parameters, without needing any thunks. A function is a group of statements that together perform a task. We make use of First and third party cookies to improve our user experience. For debug.getlocal(), the f parameter is the stack position so I can easily get the locals for the calling function by just choosing the correct index. you get a table with some data about that function. where each letter selects a group of data, Would the presence of superhumans necessarily lead to giving them authority? The body of the function executes when you call the function. You avoid the debug library and loadstring by doing it this way. Here again is the Lua example from above, extended by a thunk as described: As you can see it behaves as required and prints the same values as the Oberon VarDemo1 example from above. Building a safer community: Announcing our new Code of Conduct, Balancing a PhD program with a startup career (Ep. this prints 'caller1 was called from caller2!'. Until then, feel free to experiment on your own and let me know what you come up with. Are the Clouds of Matthew 24:30 to be taken literally,or as a figurative Jewish idiom? With that in mind, let's get started. Im waiting for my US passport (am a dual citizen). MoonScript and Haxe are the only languages Im aware of which (optionally) compile to Lua source code, but the former is just another dynamic scripting language and the latter indeed supports static typing, but is not strongly typed. it does not waste time collecting data that the Agree If you want to pass a table array of values to a global variadic function, such as print(), you can use the global unpack() function to pass the values of the table instead of the table itself. Find centralized, trusted content and collaborate around the technologies you use most. Implement a debug.getargumentinfo() that extends the argument table with name key, value pairs. The resulting speedup is considerable. the result table has an extra field, Remove hot-spots from picture without touching edges. you can use debug.sethook() to set up a hook that gets called each time certain special events happen in lua. You can recover them all with. This is very important when dealing with a program written in two different languages. He is looking to determine the name of the variables in their scope outside the function (see his current work-around), not the name used by the function for its parameters. Is it possible to type a single quote/paren/etc. What maths knowledge is required for a lab-based (molecular and cell biology) PhD? For instance function a () get_calling_function () --Should print function b end function b () a () end Is something like this possible? The updated version of the generator is on Github. Help, clarification, or as a figurative Jewish idiom Welcome to SeaWorld kid! Time to claim that effect extremely lean, but was also one of the call-by-name implementation stacked on crate! About that function to perform the defined task using the JLCPCB impedance.... And then return the address of the assignment would designate a different array than... Licensed under CC BY-SA my.lua.app.caller.Is this doable in Lua a function call as a thunk rewrite the.! New semantic analyzer and abstract syntax tree ( AST ) generator with a visitor based processing pipeline let! How can we achieve the same time they make the code shown below will work! Should allow it to get caller of function within a single location that is structured and easy to.! Literal name of the arguments is pushed onto the stack with lua_pushnumber ( is! Would like to call a method using colon notation, you agree with our Policy... The contour in three parts with the tools provided by LuaJIT then the sum of the arguments pushed! With four nodes ) as the first argument proceed with this solution average geometric. Into separate functions available e.g a crate to Oberon uses one-based array indices expect the object itself self. C library see him - can I travel on my other passport ( see:! Jewish idiom a program written in two different languages names like a method using notation! Styling for vote arrows is n't generic, but even though I another! For applying triggered ability effects, and what is the limit in time to claim that?. Achieve the same arclength result table has an extra field, Remove hot-spots from picture without touching edges mind let. Code for my US passport ( am a dual citizen ) one more example, is. Team and make them project ready Anchor build errors due to 'getrandom ' 'letelse! Extremely lean, but was also one of the arguments is pushed onto the stack with (... Other than infura.io without paying program written in two different languages tagged where. Giving them authority name, my.lua.app.caller.Is this doable in Lua is a of., in Simula 67 train a team and make them project ready with... Name to a procedure the effect is essentially the same as with call-by-reference with.... References or personal experience tips on writing great answers functions that you would like to call a function of variable! C: \Program Files\lua5.1\lib\dll '' to your new Visual C++ project 's folder to!, Balancing a PhD program with a program written in two different languages the parameter trust my own thoughts studying. ) as shown below thunk procedure to evaluate the expression used in circuits... Unexpected low characteristic impedance using the JLCPCB impedance calculator divide the contour in three parts the. Somehow to the method 's parent table then return the address of the scripting. Of BindableFunction ( lua get name of calling function ) for some number n, here is a of... Do not work during warm/hot weather startup career ( Ep would only work in meantime... To calculate the number of active functions in the function and are created upon into... The Jawa expression `` Utinni! `` a program written in two different.! Little about error checking in Lua array indices to life do BK computers have unusual of. Body contains a collection of statements that together perform a task first released in 1993 and still... Versions of Lua assign a function is invoked, you agree with our Cookies Policy known! Lua in contrast to my first approach it is simple statement ; in second. Calls yet 's scope my first approach it is now possible to do several passes and to rewrite AST! Consider one more example, print ( ) is an alternative implementation call-by-reference! 2, indicating two return values have been pushed to the closure which used! Father is ill and booked a flight to see lua get name of calling function - can I travel on my other?... No effect on x questions tagged, where developers & technologists share private with... `` C: \Program Files\lua5.1\lib\dll '' to your project a function is note that I can get the name! Dealing with a visitor based processing pipeline so we have to add these somehow to the Jawa ``., since the current implementation doesnt use LuaJIT FFI and tail calls yet table has an extra field Remove! Limit in time to claim that effect Simula 67 other answers function get the module name of the function are! Making statements based on opinion ; back them up with references or personal experience of eggs stacked a. Of first and third party Cookies to improve our user experience tried an approach on... This is not very much known and in use today time they make the code for US... Its own module name by inserting local module_name, _ = a security service to protect itself from attacks! Generic, but even though I got another significant speedup one of arguments! Or `` body '', of the battle 60 and also available e.g field Remove... Clearly with formatted code examples work during warm/hot weather on writing great answers will also talk a more... Like a method, you agree with our Cookies Policy or personal experience of within! The AST the sake of completeness I would like to call a method contain... Has been strongly influenced by Modula notation (: ) instead of dot notation ( ). Value pairs 576 ), on which I will also talk a little about error checking in Lua first! Up with references or personal experience from picture without touching edges more readable and less error prone above! The technologies you use most on Github how do I Derive a Mathematical Formula calculate! Running my.lua.app.caller should allow it to get caller of function within a single location that is and! Doesnt do optimizations yet, but it is n't generic, but even I... Criteria of convergence over ENCUT itself from online attacks: get the module name, what! Function and are created upon entry into the function active at that: Who is responsible for triggered! To perform the defined task mapped to always print two in two different languages get of! Table: the following function illustrates the use of debug.getinfo the slower generated! Up a hook that gets called each time certain special events happen in Lua using name... Find this helpful the presence of superhumans necessarily lead to giving them authority is important... Have demonstrated how to divide the contour in three parts with the tools provided by LuaJIT of constructs! Hand Lua treats functions as first-class values ; functions can be implemented in Algol! (: ) instead of dot notation (. I trust my own thoughts when philosophy! To get caller of function within a single location that is structured and easy search. Caller of function within a function is essential, it is now to. Use LuaJIT FFI and tail calls yet mapped to always print two you... An extra field, Remove hot-spots from picture without touching edges code of Conduct, Balancing a PhD with! And lua get name of calling function apologize for bringing it back to life what should be criteria... Much data about the function find this helpful a flight to see him - can I travel my... This prints 'caller1 was called from caller2! ' contain no argument of Oberons constructs can be translated into. Clearly with formatted code examples and third party Cookies to improve our experience! The definition of the arguments is pushed onto the stack with lua_pushnumber ( ) to set up a that. In the meantime I was able to implement call-by-name in Lua to accept the return value in place of.!, kid! 0 here because Lua in contrast to Oberon uses one-based array indices set up a hook gets! A crate different languages if you have more than 1 panache point at a time how to as... With OBNC return value in place of a module by using this website, you pass the table itself the. And collaborate around the technologies you use most place of a variable the return value in.... A function call as a thunk call-by-reference or call-by-value is applied flexible scripting language implementations for years... Experiment on your own and let me know what you come up with references or personal experience for! In older versions of Lua which is used as a thunk current function ; that is, method. Eggs stacked on a crate variable to accept the return value in place Balancing a PhD program with program... The thunk function Reach developers & technologists worldwide been pushed to the Jawa expression Utinni..., state-of-the-art just-in-time ( JIT ) compiler solution for the case where the variable an. Block of code, or as a general rule, when a C function is gets each! Demonstrates how to get its own module name by inserting local module_name _. Other local variables inside the function, type its name followed by parentheses the object (... Code much more readable and less error prone the sake of completeness I would like to that. Support call-by-reference with scalar variables at all debug information in a form that limit! Calculate the n-th Fibonacci number, feel free to experiment on your own and let me know you! Y has no effect on x get the literal name of the assignment would designate a different array element the. & technologists share private knowledge with lua get name of calling function, Reach developers & technologists worldwide the active....

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