function-calls

The following compiles and prints "string" as an output. #include <stdio.h> struct S { int x; char c[7]; }; struct S bar() { struct S s = {42, "string"}; return s; } int main() { printf("%s", bar().c); } Apparently this seems to invokes an undefined behavior according to C99 6.5.2.2/5 If an attempt is made to modify the result of a function call or to access it after the next sequence point, the behavior is undefined. I don't understand where it says about "next sequence point". What's going on here? You've run into a subtle corner of the language. An expression of array type is, in most

Is it possible to view JavaScript function calls in the browser's JavaScript console? I know you can view XHR, but can you view function calls? For example, I hover my mouse over some element on a page and a div pops up. I know there was a JavaScript function that was called to show the popup so it would be nice to be able to view this call in the console so I can see what function was called. Am I missing something or is this not possible? victorhooi So basically you want to view JS calls in real-time? The Firebug extension on Firefox offers that ( http://getfirebug.com/javascript ).

When you define a function in Python with an array parameter, what is the scope of that parameter? This example is taken from the Python tutorial: def f(a, L=[]): L.append(a) return L print f(1) print f(2) print f(3) Prints: [1] [1, 2] [1, 2, 3] I'm not quite sure if I understand what's happening here. Does this mean that the scope of the array is outside of the function? Why does the array remember its values from call to call? Coming from other languages, I would expect this behavior only if the variable was static. Otherwise it seems it should be reset each time. And actually, when I tried

The below function generates error when a function contains referenced arguments eg: function test(&$arg, &$arg2) { // some code } Now I can not use call_user_func_array for above function, it will generate an error. How to solve this problem? I do need to use call_user_func_array . Also assume that i don't know beforehand whether they are passed by reference or passed by value. Thanks A great workaround was posted on http://www.php.net/manual/de/function.call-user-func-array.php#91503 function executeHook($name, $type='hooks'){ $args = func_get_args(); array_shift($args); array_shift($args);

Is there any way to call a Scala function that takes individual parameters, given an array (similar to JavaScript Spreads in ECMAScript 6)? ys = [10.0, 2.72, -3.14] f(x, ...ys); The cleanest syntax would be: f(1, ys) but that does not appear to be possible. Even f(1, ys:_*) does not work (and neither does f(ys:_*) , as the compiler reports too few parameters - only the first one is filled). Example: def f (a:Int, b:Float, c:Float, d:Float): String val x = 1 val ys = List(10.0, 2.72, -3.14) // note: non-Objects val result = f(x, ys) // intuitive, but doesn't work Use Case: injecting test data

In this post , Guido van Rossum says that a function call may be expensive, but I do not understand why nor how much expensive can be. How much delay adds to your code a simple function call and why? A function call requires that the current execution frame is suspended, and a new frame is created and pushed on the stack. This is relatively expensive, compared to many other operations. You can measure the exact time required with the timeit module: >>> import timeit >>> def f(): pass ... >>> timeit.timeit(f) 0.15175890922546387 That's 1/6th of a second for a million calls to an empty function;

I don't have experience in assembly, but this is what I've been working on. I would like input if I'm missing any fundamental aspects to passing parameters and calling a function via pointer in assembly. For instance I'm wondering if I supposed to restore ecx , edx , esi , edi . I read they are general purpose registers, but I couldn't find if they need to be restored? Is there any kind of cleanup I am supposed to do after a call? This is the code I have now, and it does work: #include "stdio.h" void foo(int a, int b, int c, int d) { printf("values = %d and %d and %d and %d\r\n", a, b, c, d);