大约有 12,000 项符合查询结果（耗时：0.0361秒） [XML]
Is there a performance difference between i++ and ++i in C?
...uld indeed be slower since with ++it you can just return the final value.
Foo Foo::operator++()
{
Foo oldFoo = *this; // copy existing value - could be slow
// yadda yadda, do increment
return oldFoo;
}
Another difference is that with ++i you have the option of returning a reference instead...
jQuery get value of select onChange
...ith script you need to pass a reference to the current element:
onselect="foo(this);"
and then:
function foo(element) {
// $(element).val() will give you what you are looking for
}
share
|
...
Why does cURL return error “(23) Failed writing body”?
...ious program is finished writing the whole page.
In curl "url" | grep -qs foo, as soon as grep has what it wants it will close the read stream from curl. cURL doesn't expect this and emits the "Failed writing body" error.
A workaround is to pipe the stream through an intermediary program that alwa...
How can I print variable and string on same line in Python?
...print statement separates the items by a single space:
>>> print "foo","bar","spam"
foo bar spam
or better use string formatting:
print "If there was a birth every 7 seconds, there would be: {} births".format(births)
String formatting is much more powerful and allows you to do some other ...
HTML: Include, or exclude, optional closing tags?
.... Putting end tags won't automatically make parsing more robust:
<p>foo <p>bar</p> baz</p>
will parse as:
<p>foo</p><p>bar</p> baz
It can only help when you validate documents.
...
How to pad zeroes to a string?
...0:03d}'.format(n)) # python >= 2.6 + python 3
004
>>> print('{foo:03d}'.format(foo=n)) # python >= 2.6 + python 3
004
>>> print('{:03d}'.format(n)) # python >= 2.7 + python3
004
String formatting documentation.
...
Reference - What does this error mean in PHP?
...pical example of an Undefined Index notice would be (demo)
$data = array('foo' => '42', 'bar');
echo $data['spinach'];
echo $data[1];
Both spinach and 1 do not exist in the array, causing an E_NOTICE to be triggered.
The solution is to make sure the index or offset exists prior to accessing t...
How do I create a folder in a GitHub repository?
... store empty folders. Just make sure there's a file in the folder like doc/foo.txt and run git add doc or git add doc/foo.txt, and the folder will be added to your local repository once you've committed (and appear on GitHub once you've pushed it).
...
error: passing xxx as 'this' argument of xxx discards qualifiers
...w. I have a coworker who refers to me as the "const-able". 8v) Change that foo obj; to const foo obj; once and see what happens. Or pass a const reference to a foo.
– Fred Larson
May 12 '11 at 5:06
...
Does return stop a loop?
...inally always executes and can "override" the return in the try.
function foo() {
try {
for (var i = 0; i < 10; i++) {
if (i % 3 == 0) {
return i; // This executes once
}
}
} finally {
return 42; // But this still executes
...