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Marshalling data between C and Lua functions is also done using the stack. To call a Lua function, arguments are pushed onto the stack, and then the lua_call is used to call the actual function. When writing a C function to be directly called from Lua, the arguments are read from the stack. Here is an example of calling a Lua function from C:
Function names are often of the form p.myFunctionName, where p is the table from the return p at the bottom of your program. The reason for this is that you can only access functions that are entries in this table from the original #invoke statement. Functions for local use within the program can have any name.
This module provides a number of basic mathematical operations.]] local yesno, getArgs-- lazily initialized local p = {}-- Holds functions to be returned from #invoke, and functions to make available to other Lua modules. local wrap = {}-- Holds wrapper functions that process arguments from #invoke. These act as intemediary between functions ...
The term closure is often used as a synonym for anonymous function, though strictly, an anonymous function is a function literal without a name, while a closure is an instance of a function, a value, whose non-local variables have been bound either to values or to storage locations (depending on the language; see the lexical environment section below).
Non-local variables are the primary reason it is difficult to support nested, anonymous, higher-order and thereby first-class functions in a programming language. If the nested function or functions are (mutually) recursive, it becomes hard for the compiler to know exactly where on the call stack the non-local variable was allocated, as the frame pointer only points to the local variable of ...
function p. q is syntactic sugar for p ["q"] = function. function builds a function. It doesn't declare it. Functions are first-class objects and can be assigned to variables, placed in tables, serialized into strings, and deserialized back out again. Think interpreted, not compiled.
It is intended for use by other Lua modules, and should not be-- called from #invoke directly. local libraryUtil = require ('libraryUtil') local checkType = libraryUtil. checkType local arguments = {}-- Generate four different tidyVal functions, so that we don't have to check the-- options every time we call it. local function tidyValDefault ...
If you set it too low, you may get different random numbers appearing on the same page,-- particularly for pages that take many seconds to process. cfg. seedRefreshRate = 60----- End configuration-----local p = {}-- For functions available from other Lua modules. local l = {}-- For functions not available from other Lua modules, but that need ...