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Why do we need a pure virtual destructor in C++?
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Probably the real reason that pure virtual destructors are allowed is that to prohibit them would mean adding another rule to the language and there's no need for this rule since no ill-effects can come from allowing a pure virtual destructor.
Nope, plain old virtual is enough.
If...
CSS3 Transparency + Gradient
...radient Generator over at Colorzilla which has a bunch of nice presets and all the cross browser compatible variations to achieve your desired gradient
– andrhamm
Nov 23 '11 at 16:16
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How to add to the PYTHONPATH in Windows, so it finds my modules/packages?
I have a directory which hosts all of my Django apps ( C:\My_Projects ). I want to add this directory to my PYTHONPATH so I can call the apps directly.
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Default background color of SVG root element
...ways matches the viewport it gets, so it won't fill the entire viewport in all situations.
– Erik Dahlström
Jul 2 '12 at 12:48
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Are the shift operators () arithmetic or logical in C?
...ependent for right shifts of signed values.
Wikipedia says that C/C++ 'usually' implements an arithmetic shift on signed values.
Basically you need to either test your compiler or not rely on it. My VS2008 help for the current MS C++ compiler says that their compiler does an arithmetic shift.
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C++ Tuple vs Struct
... not the purpose of this discussion so I won't dive into the detail.
We all know that writing a == or < or > operator for every single struct definition will be a painful and buggy task. Let replace our custom comparator using std::tie and rerun our benchmark.
bool operator<(const Str...
What is the difference between screenX/Y, clientX/Y and pageX/Y?
...upper left. This point could be anywhere in the browser window and can actually change location if there are embedded scrollable pages embedded within pages and the user moves a scrollbar.
screenX and screenY:
Relative to the top left of the physical screen/monitor, this reference point only moves ...
Responsively change div size keeping aspect ratio [duplicate]
...tio, but if I want the same effect with another element, is it possible at all to tie the width and the height together using percentage?
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ASP.NET MVC: Custom Validation by DataAnnotation
...ationContext.ObjectInstance, null)).OfType<string>();
var totalLength = values.Sum(x => x.Length) + Convert.ToString(value).Length;
if (totalLength < this.MinLength)
{
return new ValidationResult(this.FormatErrorMessage(validationContext.DisplayName));...
Cookies vs. sessions
...ad of sessions? I have just that reason (that I do not need to store internally information about the user). Is that enough as a reason ? or it's more than that?
Could you please tell me about advantages/disadvantages of using cookies for keeping User's ID?
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