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Do I cast the result of malloc?
...zeof first, in this case, ensures multiplication is done with at least size_t math.
Compare: malloc(sizeof *sieve * length * width) vs. malloc(length * width * sizeof *sieve) the second may overflow the length * width when width and length are smaller types than size_t.
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How to install the JDK on Ubuntu Linux
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Referring to Ask Ubuntu question How to set JAVA_HOME for OpenJDK?,
How to install Open JDK (Java developement kit) in Ubuntu (Linux)?
Open Terminal from Application Dash or press Ctrl+Alt+T
Update repository:
sudo add-apt-repository ppa:openjdk-r/ppa # only Ubuntu 17...
Copy file or directories recursively in Python
...opying files and folders recursively. (Python 3.X)
import os, shutil
root_src_dir = r'C:\MyMusic' #Path/Location of the source directory
root_dst_dir = 'D:MusicBackUp' #Path to the destination folder
for src_dir, dirs, files in os.walk(root_src_dir):
dst_dir = src_dir.replace(root_src_dir...
What is Lazy Loading?
...:
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@property
def total(self):
if not hasattr(self, "_total"):
self._total = self.quantity \
+ sum(bi.quantity for bi in self.borroweditem_set.all())
return self._total
Basically, I have an Item class which represents an item in our inven...
Undoing a 'git push'
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Then you need to 'force' push the old reference.
git push -f origin last_known_good_commit:branch_name
or in your case
git push -f origin cc4b63bebb6:alpha-0.3.0
You may have receive.denyNonFastForwards set on the remote repository. If this is the case, then you will get an error which inclu...
indexOf method in an object array?
...ethod for doing exactly what Pablo's anonymous map method does.
var idx = _.chain(myArray).pluck("hello").indexOf("Stevie").value();
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How to prevent ifelse() from turning Date objects into numeric objects
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You may use data.table::fifelse (data.table >= 1.12.3) or dplyr::if_else.
data.table::fifelse
Unlike ifelse, fifelse preserves the type and class of the inputs.
library(data.table)
dates <- fifelse(dates == '2011-01-01', dates - 1, dates)
str(dates)
# Date[1:5], format: "2010-12-31" "2...
How to replace local branch with remote branch entirely in Git?
... probably you will need to fetch first: git fetch origin remote_branch
– b1r3k
Jul 30 '14 at 12:16
60
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How to fix the “java.security.cert.CertificateException: No subject alternative names present” error
...t browser validation for SSL protocols (Poodle vulnerability) gives me: ssl_error_no_cypher_overlap. Any ideas?
– will824
May 28 '15 at 22:34
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Making 'git log' ignore changes for certain paths
...ated pathspecs
Reported-by: John Millikin
Signed-off-by: Elijah Newren
do_match_pathspec() started life as match_pathspec_depth_1() and for correctness was only supposed to be called from match_pathspec_depth(). match_pathspec_depth() was later renamed to match_pathspec(), so the invariant we ex...