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Why use a ReentrantLock if one can use synchronized(this)?
...lso has support for configurable fairness policy, allowing more flexible thread scheduling.
The constructor for this class accepts an optional fairness parameter. When set true, under contention, locks favor granting access to the longest-waiting thread. Otherwise this lock does not guarantee any p...
std::string length() and size() member functions
I was reading the answers for this question and found that there is actually a method called length() for std::string (I always used size() ). Is there any specific reason for having this method in std::string class? I read both MSDN and CppRefernce, and they seem to indicate that there is ...
AngularJS directive with default options
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You can use compile function - read attributes if they are not set - fill them with default values.
.directive('pagination', ['$parse', 'paginationConfig', function($parse, config) {
...
controller: 'PaginationController',
compile: function(el...
How to parse XML to R data frame
...akes it easier to ensure everything is lined up:
library(xml2)
data <- read_xml("http://forecast.weather.gov/MapClick.php?lat=29.803&lon=-82.411&FcstType=digitalDWML")
# Point locations
point <- data %>% xml_find_all("//point")
point %>% xml_attr("latitude") %>% as.numeric()...
How to download/checkout a project from Google Code in Windows?
...ng this project "svn checkout myproject.googlecode.com/svn/trunk myproject-read-only" you would ONLY use "myproject.googlecode.com/svn/trunk" as the URL, after the space is just a title and I feel this might be helpful for someone who comes into the same confusion
– zfb
...
difference between variables inside and outside of __init__()
... varnamevariable set outside the init does belong to the class, and may be read via self.varname producing the same value for all instances. However, when assigned a value via an instance reference (as in self.varname = X) a new self.varname will be created for that instance only, obscuring the cla...
How to change highlighted occurrences color in Eclipse's sidebar?
...e color of "Occurrences" is used for instances where the variable is being read, but not modified, in the code (e.g. k in if(k > 1)).
The color of "Write Occurrences" is used where the variable gets modified/written to in the code (e.g. k in k = k + 1).
See also the official Eclipse documentat...
How to generate a random alpha-numeric string?
...me fairly simple and very flexible code for generating random identifiers. Read the information that follows for important application notes.
public class RandomString {
/**
* Generate a random string.
*/
public String nextString() {
for (int idx = 0; idx < buf.length;...
Understand convertRect:toView:, convertRect:FromView:, convertPoint:toView: and convertPoint:fromVie
... Great answer. Helped clear up a lot for me. Any additional reading?
– JaeGeeTee
Jan 8 '14 at 16:06
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show 2 more comments
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内存调试技巧：C 语言最大难点揭秘 - C/C++ - 清泛网 - 专注C/C++及内核技术
...********
* ...
*
* Note that any function invoking protected_file_read()
* assumes responsibility eventually to fclose() its
* return value, UNLESS that value is NULL.
*
********/
FILE *protected_file_read(char *filename)
{
FILE *fp;
fp = fopen(filename, "r");
...