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What is the performance cost of having a virtual method in a C++ class?
... 3ghz in-order PowerPC processor. On that architecture, a virtual function call costs 7 nanoseconds longer than a direct (non-virtual) function call.
So, not really worth worrying about the cost unless the function is something like a trivial Get()/Set() accessor, in which anything other than inl...
View's getWidth() and getHeight() returns 0
I am creating all of the elements in my android project dynamically. I am trying to get the width and height of a button so that I can rotate that button around. I am just trying to learn how to work with the android language. However, it returns 0.
...
Asynchronously load images with jQuery
....on('load', function() {
if (!this.complete || typeof this.naturalWidth == "undefined" || this.naturalWidth == 0) {
alert('broken image!');
} else {
$("#something").append(img);
}
});
...
Reflection: How to Invoke Method with parameters
...
Change "methodInfo" to "classInstance", just like in the call with the null parameter array.
result = methodInfo.Invoke(classInstance, parametersArray);
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Best way to track onchange as-you-type in input type=“text”?
...opertychange. I use it like this:
const source = document.getElementById('source');
const result = document.getElementById('result');
const inputHandler = function(e) {
result.innerHTML = e.target.value;
}
source.addEventListener('input', inputHandler);
source.addEventListener('prop...
Use of .apply() with 'new' operator. Is this possible?
...ECMAScript5's Function.prototype.bind things get pretty clean:
function newCall(Cls) {
return new (Function.prototype.bind.apply(Cls, arguments));
// or even
// return new (Cls.bind.apply(Cls, arguments));
// if you know that Cls.bind has not been overwritten
}
It can be used as fol...
Microsoft Roslyn vs. CodeDom
... to parse code, perform semantic analysis, compile and evaluate code dynamically, etc.
In addition to the compilers, the Roslyn team is also rebuilding the Visual Studio C# and VB IDE features on top of the public compiler APIs. So, the compiler APIs are rich enough to build the Visual Studio desig...
Difference between new and override
...use the last defined
implementation of a method. Even if
the method is called on a reference to
the base class it will use the
implementation overriding it.
public class Base
{
public virtual void DoIt()
{
}
}
public class Derived : Base
{
public override void DoIt()
{...
How can I run a function from a script in command line?
...context of the current shell using the source or . command and then simply call the function. See help source for more information.
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What is the difference between a function expression vs declaration in JavaScript? [duplicate]
...
They're actually really similar. How you call them is exactly the same.The difference lies in how the browser loads them into the execution context.
Function declarations load before any code is executed.
Function expressions load only when the interpreter reaches...