function-call

问题 I´ve got a javascript method that calls a php method to get some data in the array "availabletags". To prove if the function is even called, I added availableTags[0] = "Test"; When I put it on my server to try it, nothings happens. So I think the javascript function isn´t called. <link rel="stylesheet" href="js/demos.css"> <script type="text/javascript"> $(function() { var availableTags = new Array(400); availableTags[0] = "Test"; availableTags = JSON.parse(<?php echo '"'.addslashes(include("

问题 Why int array[] raise a compilation error in main but not in function prototype ? Should it mean that it is better to always write int * array in function prototype ? void myfoo (int array[]) { // No compilation error ;} void myfoo1 (int *array1) { // No compilation error ;} int main() { int array[]; // Compilation error int* array1; // No compilation error } 回答1: Fundamentally, the reason an array declaration inside the block for main needs a size and the array declaration in the function

问题 The recursive setTimeout function getRandomProducts is called onload in the html body tag, and so is constantly iterating. The function setCategoryTree is being called onclick from the links in a nested ul of a navigation-bar. This function then passes the variable mainCategory to getRandomProducts, in which the variable is declared globally to maintain its' initialization. ...So, what I am trying to do is reset the getRandomProducts function when a link is clicked in the navigation-bar, and

问题 Here is an example of a code that works perfectly: #include<iostream> #include<vector> template< class D, template< class D, class A > class C, class A = std::allocator< D > > void foo( C< D, A > *bar, C< D, A > *bas ) { std::cout << "Ok!" << std::endl; } int main( ) { std::vector< int > *sample1 = nullptr; std::vector< int > *sample2 = nullptr; foo( sample1, sample2 ); return( 0 ); } In the code below, however, the compiler is unable to match std::vector< int >* with nullptr for the second

问题 Here is an example of a code that works perfectly: #include<iostream> #include<vector> template< class D, template< class D, class A > class C, class A = std::allocator< D > > void foo( C< D, A > *bar, C< D, A > *bas ) { std::cout << "Ok!" << std::endl; } int main( ) { std::vector< int > *sample1 = nullptr; std::vector< int > *sample2 = nullptr; foo( sample1, sample2 ); return( 0 ); } In the code below, however, the compiler is unable to match std::vector< int >* with nullptr for the second

问题 I read that when a function call is made by a program, the called function must know how to return to its caller. My question is: How does the called function know how to return to its caller? Is there a mechanism working behind the scenes through the compiler? 回答1: The compiler obeys a particular "calling convention", defined as part of the ABI you're targeting. That calling convention will include a way for the system to know what address to return to. The calling convention usually takes

问题 Kindly help me to solve this issue. I am using jquery datepicker with AngularJS. I am trying to get the selected date and pass it with a function as parameter. For this I am using the following code. Html: <input type="text" "ng-model="gettingStartDate" ng-change="newTest(gettingStartDate)" /> Date Picker: $( "#date1" ).datepicker(); AngularJS: function getOrg($scope, $http) { $scope.newTest = function(start_date){ alert(start_date); }; } 回答1: Such complex UI components need to be wrapped

问题 I wrote an examination about C++ programming. There was one question where I and my professor didn't agree. The question was, does the following function work or not: #include <iostream> using namespace std; void f(int=4, long=10, double=3.14); int main( int argc , char ** argv ) { f( , ,8); return EXIT_SUCCESS; } void f(int i, long l, double d) { cout << i << " " << " " << l << " " << d; } I said it would not work, but my professor said it will definitely work because of the default

问题 Trying to extract the subsets with length k using filter. Not sure how to approach it? The list has 100 elements . subsets :: [a] -> [[a]] subsets [] = [[]] subsets (x:xs) = [zs | ys <- subsets xs, zs <- [ys, (x:ys)]] If i use filter this is what i thought it would be: filter (length(3)) subsets [1,2,3,4,5] But i'm probably wrong. If there is a different approach rather than filter? I'm new to haskell so not exactly sure. 回答1: When I get stuck with a little confusion in filtering, I go a

问题 If you want to call a C/C++ function from inline assembly, you can do something like this: void callee() {} void caller() { asm("call *%0" : : "r"(callee)); } GCC will then emit code which looks like this: movl $callee, %eax call *%eax This can be problematic since the indirect call will destroy the pipeline on older CPUs. Since the address of callee is eventually a constant, one can imagine that it would be possible to use the i constraint. Quoting from the GCC online docs: `i' An immediate