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Why use apparently meaningless do-while and if-else statements in macros?
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The do ... while and if ... else are there to make it so that a
semicolon after your macro always means the same thing. Let's say you
had something like your second macro.
#define BAR(X) f(x); g(x)
Now if you were to use BAR(X); in an if ... else statement, where the bodi...
Convert int to string?
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edited Mar 14 at 1:20
answered Jun 21 '10 at 3:15
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Using semicolon (;) vs plus (+) with exec in find
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This might be best illustrated with an example. Let's say that find turns up these files:
file1
file2
file3
Using -exec with a semicolon (find . -exec ls '{}' \;), will execute
ls file1
ls file2
ls file3
But if you use a plus sign instead (find . -e...
Canvas width and height in HTML5
Is it possible to fix the width and height of an HTML5 canvas element?
4 Answers
4
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Determining Referer in PHP
What is the most reliable and secure way to determine what page either sent, or called (via AJAX), the current page. I don't want to use the $_SERVER['HTTP_REFERER'] , because of the (lack of) reliability, and I need the page being called to only come from requests originating on my site.
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How big can a user agent string get?
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HTTP specification does not limit length of headers at all.
However web-servers do limit header size they accept, throwing 413 Entity Too Large if it exceeds.
Depending on web-server and their settings these limits vary from 4KB to 64KB (total for all h...
How to debug JavaScript / jQuery event bindings with Firebug or similar tools?
...eg): $('#foo').click(function() { console.log('clicked!') });
You inspect it like so:
jQuery 1.3.x
var clickEvents = $('#foo').data("events").click;
jQuery.each(clickEvents, function(key, value) {
console.log(value) // prints "function() { console.log('clicked!') }"
})
jQuery 1.4.x
var click...
When to use IMG vs. CSS background-image?
In what situations is it more appropriate to use an HTML IMG tag to display an image, as opposed to a CSS background-image , and vice-versa?
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Fast Linux File Count for a large number of files
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Note that this will also enable -a, so ., .., and other files starting with . will be counted.
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How to get an enum value from a string value in Java?
...n source code. They do appear in Javadoc, though; for example, Dialog.ModalityType shows both methods.
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