大约有 11,644 项符合查询结果（耗时：0.0160秒） [XML]
How expensive is RTTI?
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if (typeid(a) == typeid(b)) {
B* ba = static_cast<B*>(&a);
etc;
}
instead of
B* ba = dynamic_cast<B*>(&a);
if (ba) {
etc;
}
The former involves only one comparison of std::type_info; the latter necessarily involves traversing an inheritance tree plus comparisons.
P...
Google fonts URL break HTML5 Validation on w3.org
...e special characters would need to be encoded by HTML rules (e.g. &amp etc). The user agent is then expected to follow RFC 3987 and convert the IRI to percent encoded UTF-8 before submitting it over HTTP (tools.ietf.org/html/rfc3987).
– Mikko Rantalainen
O...
Find if variable is divisible by 2
... There is so much that jQuery can do, like creating variables, functions, etc., that is still being done with raw JavaScript. Just unbelievable ;-)
– Anurag
May 13 '10 at 9:10
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Error renaming a column in MySQL
... you lose all other column definitions such as nullability, default value, etc. (see: stackoverflow.com/questions/8553130/…).
– Dejan
Jul 13 '15 at 10:50
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multiple packages in context:component-scan, spring config
... the package that is start with x.y.z like:
x.y.z.controller,x.y.z.service etc.
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Wait one second in running program
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Personally I think Thread.Sleep is a poor implementation. It locks the UI etc. I personally like timer implementations since it waits then fires.
Usage: DelayFactory.DelayAction(500, new Action(() => { this.RunAction(); }));
//Note Forms.Timer and Timer() have similar implementations.
p...
What is the best Battleship AI?
... about the world (e.g. ships can't overlap, all hit squares must be ships, etc.) you can count how often ships occur at each unexplored position to estimate the likelihood that a ship is sitting there.
This can be visualized as a heat map, where hot spots are more likely to contain ships:
a heat...
What is the string concatenation operator in Oracle?
... I am confused - if by "logical operator" you mean operators like AND, NOT etc. then of course || is not a logical operator. But what does that have to due with 'x'||null returning x? n+null returns null, so is + a logical operator?
– Tony Andrews
Jul 20 '12 ...
Eclipse “Server Locations” section disabled and need to change to use Tomcat installation
...ecent tool would figure out all this tinkering by itself, clean by itself, etc... yes I know it's a plugin but still..
– rapt
Mar 18 '12 at 19:32
1
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When do you use Git rebase instead of Git merge?
...eating here -- remember that all these terms (merge, rebase, fast-forward, etc.) are referring to specific manipulations of a directed acyclic graph. They become easier to reason about with that mental model in mind.
– Roy Tinker
Jan 27 '17 at 19:24
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