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git pull while not in a git directory
...a different directory without leaving the current directory:
(cd ~/foo && git status)
git --git-dir=~/foo/.git --work-tree=~/foo status
GIT_DIR=~/foo/.git GIT_WORK_TREE=~/foo git status
(cd ../..; git grep foo)
for d in d1 d2 d3; do (cd $d && git svn rebase); done
...
Using sed and grep/egrep to search and replace
...d separator. This is important to match the -Z of egrep and to avoid being fooled by spaces and newlines in input filenames.
-l: use one line per command as parameter
sed: the stream editor
-i: replace the input file with the output without making a backup
-e: use the following argument as expres...
How do I return multiple values from a function in C?
... Tuple getPair() {
Tuple r = { 1, getString() };
return r;
}
void foo() {
struct Tuple t = getPair();
}
2: Use pointers to pass out values.
void getPair(int* a, string* b) {
// Check that these are not pointing to NULL
assert(a);
assert(b);
*a = 1;
*b = getString(...
Curious null-coalescing operator custom implicit conversion behaviour
... analysis but before code generation -- we reduce the expression
result = Foo() ?? y;
from the example above to the moral equivalent of:
A? temp = Foo();
result = temp.HasValue ?
new int?(A.op_implicit(Foo().Value)) :
y;
Clearly that is incorrect; the correct lowering is
result = te...
Unicode equivalents for \w and \b in Java regular expressions?
...roperties, too. It now tracks The Unicode Standard, in both RL1.2 and RL1.2a from UTS#18: Unicode Regular Expressions. This is an exciting and dramatic improvement, and the development team is to be commended for this important effort.
Java’s Regex Unicode Problems
The problem with Java regex...
Add only non-whitespace changes
...is works
git stash && git stash apply && git diff -w > foo.patch && git checkout . && git apply foo.patch && rm foo.patch
I don't like the stashes, but I have run into a bug in git + cygwin where I lose changes, so to make sure that stuff went to the ref...
Create new user in MySQL and give it full access to one database
...mysql -e "SELECT 1"
or print statement from the standard input:
$ echo "FOO STATEMENT" | mysql
If you've got Access denied with above, specify -u (for user) and -p (for password) parameters, or for long-term access set your credentials in ~/.my.cnf, e.g.
[client]
user=root
password=root
Sh...
To ternary or not to ternary? [closed]
...subconscious rules I tend to follow are:
Only evaluate 1 expression - so foo = (bar > baz) ? true : false, but NOT foo = (bar > baz && lotto && someArray.Contains(someValue)) ? true : false
If I'm using it for display logic, e.g. <%= (foo) ? "Yes" : "No" %>
Only really ...
What is stdClass in PHP?
...eturns an StdClass instance.
<?php
//Example with StdClass
$json = '{ "foo": "bar", "number": 42 }';
$stdInstance = json_decode($json);
echo $stdInstance->foo . PHP_EOL; //"bar"
echo $stdInstance->number . PHP_EOL; //42
//Example with associative array
$array = json_decode($json, true);
ec...
What are C++ functors and their uses?
...function, to create functors from functions and methods, like this:
class Foo
{
public:
void operator () (int i) { printf("Foo %d", i); }
};
void Bar(int i) { printf("Bar %d", i); }
Foo foo;
boost::function<void (int)> f(foo);//wrap functor
f(1);//prints "Foo 1"
boost::function<void (i...