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How does C compute sin() and other math functions?
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In GNU libm, the implementation of sin is system-dependent. Therefore you can find the implementation, for each platform, somewhere in the appropriate subdirectory of sysdeps.
One directory includes an implementation in C, contributed by IBM. Since October 2011, this is the code that actu...
printf with std::string?
...fe, since it uses variable arguments in the C sense1. printf has no option for std::string, only a C-style string. Using something else in place of what it expects definitely won't give you the results you want. It's actually undefined behaviour, so anything at all could happen.
The easiest way to ...
No compiler is provided in this environment. Perhaps you are running on a JRE rather than a JDK?
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For me it was enough just to add the JDK to the list of "Installed JREs" (not the best naming...) and checking the check box beside the new JDK entry making it the default VM.
– Tom Fink
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Animate change of view controllers without using navigation controller stack, subviews or modal cont
...mplement the same logic directly in your app delegate eliminating the need for the TransitionController class. The logic you'd need would be the same however.
Use it as follows:
In your app delegate
// add a property for the TransitionController
- (BOOL)application:(UIApplication *)application d...
Is it safe to parse a /proc/ file?
...your code if you assume too much about the consistency of a file in /proc. For example, see this bug which came from assuming that /proc/mounts was a consistent snapshot.
For example:
/proc/uptime is totally atomic, as someone mentioned in another answer -- but only since Linux 2.6.30, which is l...
UIButton: Making the hit area larger than the default hit area
... interface builder, but I am finding that the hit area is not large enough for some people's fingers.
36 Answers
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Nginx缓存解决方案：SRCache - 更多技术 - 清泛网 - 专注C/C++及内核技术
....var.request_uri, "\\?.*", "")
table.unpack = table.unpack or unpack
for index, rule in ipairs(phoenix["rule"]) do
if type(rule["regex"]) == "string" then
rule["regex"] = {rule["regex"], ""}
end
local regex, options = table.unpack(rule["regex"])
if ngx.re.match...
What are libtool's .la file for?
What are libtool's .la files for? How are they used with a shared object?
3 Answers
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How to use HTML Agility pack
...he .NET framework. While HtmlEntity.DeEntitize() is another useful method for processing html entities correctly. (thanks Matthew)
HtmlDocument and HtmlNode are the classes you'll use most. Similar to an XML parser, it provides the selectSingleNode and selectNodes methods that accept XPath expr...
Keyboard shortcuts in WPF
...e to hold a command (preferably as a property in a static class you create for commands - but for a simple example, just using a static attribute in window.cs):
public static RoutedCommand MyCommand = new RoutedCommand();
Add the shortcut key(s) that should invoke method:
MyCommand.InputGestures...