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Why should I declare a virtual destructor for an abstract class in C++?
...-virtual destructor to avoid v-pointer on each object of the class *.
Yes: Read next question.
Is your base class abstract? (i.e. any virtual pure methods?)
No: Try to make your base class abstract by redesigning your class hierarchy
Yes: Read next question.
Do you want to allow polymorphic del...
What is the difference between using IDisposable vs a destructor in C#?
When would I implement IDispose on a class as opposed to a destructor? I read this article , but I'm still missing the point.
...
How to have Emacs auto-refresh all buffers when files have changed on disk?
... I have set the variable in .emacs, but when i edit some code xcode, then read the file(already open) at that line, edit in xcode not there, need M-x revert-buffer handly.(mac + emacs 24.3.1)
– ericfang
May 7 '13 at 3:38
...
Move an array element from one array position to another
...
this.splice(to, 0, this.splice(from, 1)[0]);
};
which is awesome to read, but if you want performance (in small data sets) try...
Array.prototype.move2 = function(pos1, pos2) {
// local variables
var i, tmp;
// cast input parameters to integers
pos1 = parseInt(pos1, 10);
...
What are '$$' used for in PL/pgSQL
...Insert text with single quotes in PostgreSQL
As to your second question:
Read the most excellent manual on CREATE FUNCTION to understand the last line of your example.
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How to construct a REST API that takes an array of id's for the resources
...fo, I prefer id=id1,id2,id3 because it makes the URI shorter and easier to read (by a human, during a debugging operation for example). Individual parameters for each value would make the URI especially harder to follow if there are other parameters between ids: api.com/users?id=id1&id=id2&j...
What should every JavaScript programmer know? [closed]
...hem; using them with inline anonymous function expressions to get compact, readable code.
The flow of control between the browser and user code; synchronous and asynchronous execution; events that fire inside the flow of control (eg. focus) vs. events and timeouts that occur when control returns; ho...
Unable to update the EntitySet - because it has a DefiningQuery and no element exis
...ption is to add a primary key to the table. Full stop. If you can do this, read no further.
But if you can't, or just hate yourself, there's a way to do it without the primary key.
In my case, I was working with a legacy system (originally flat files on a AS400 ported to Access and then ported to ...
Why should I avoid std::enable_if in function signatures
...template parameter approach has at least two advantages over the others:
readability: the enable_if use and the return/argument types are not merged together into one messy chunk of typename disambiguators and nested type accesses; even though the clutter of the disambiguator and nested type can b...
Gulp.js task, return on src?
...so it's async.
Without it the task system wouldn't know when it finished. Read the docs.
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