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Xcode doesn't show the line that causes a crash
Every time my app crashes Xcode highlights the UIApicationMain() call in the main() function as the line that caused the crash. In some cases that used to be normal (segmentation fault for example) but the crash I am trying to deal with is a simple SIGABRT with detailed information logged in the con...
Default value of function parameter
...rom a different .cpp file, you will be able to see the difference.
Specifically, suppose:
lib.h
int Add(int a, int b);
lib.cpp
int Add(int a, int b = 3) {
...
}
test.cpp
#include "lib.h"
int main() {
Add(4);
}
The compilation of test.cpp will not see the default parameter declarat...
How can I listen to the form submit event in javascript?
...rm Element*/;
if(ele.addEventListener){
ele.addEventListener("submit", callback, false); //Modern browsers
}else if(ele.attachEvent){
ele.attachEvent('onsubmit', callback); //Old IE
}
callback is a function that you want to call when the form is being submitted.
About EventTar...
Change the Right Margin of a View Programmatically?
Can this attribute be changed dynamically in Java code?
4 Answers
4
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std::function and std::bind: what are they, and when should they be used?
...
Also handy for callbacks to member functions: myThread=boost::thread(boost::bind(&MyClass::threadMain, this))
– rlduffy
Jul 9 '11 at 3:10
...
from jquery $.ajax to angular $http
...
The AngularJS way of calling $http would look like:
$http({
url: "http://example.appspot.com/rest/app",
method: "POST",
data: {"foo":"bar"}
}).then(function successCallback(response) {
// this callback will be called asynchro...
Mongoose indexing in production code
...ndex in production. Once the index has been added, subsequent ensureIndex calls will simply see that the index already exists and then return. So it only has an effect on performance when you're first creating the index, and at that time the collections are often empty so creating an index would b...
Overriding class constants vs properties
...
In PHP, self refers to the class in which the called method or property is defined. So in your case you're calling self in ChildClass, so it uses the variable from that class. Then you use self in ParentClass, so it wil then refer to the variable in that class.
if you s...
How can I clear an HTML file input with JavaScript?
...serve events and other attributes that were added to an element programmatically. In my case, I added an onclick event to a form element which disappeared after form reset. In such a case, approach 1. is better. (This was noted for 2., but can also happen for 3.)
– Wolfie Inu
...
valueOf() vs. toString() in Javascript
...ght that the toString() method got invoked whenever a string conversion is called for, but apparently it is trumped by valueOf().
...