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DESTDIR and PREFIX of make
...all it to a different place but not create all the directories as DESTDIR=/foo/bar/baz would. It's commonly used with GNU stow via
./configure --prefix=/usr/local && make && sudo make install prefix=/usr/local/stow/foo
, which would install binaries in /usr/local/stow/foo/bin. By ...
How to assign a heredoc value to a variable in Bash?
...th this:
$ read -r -d '' VAR <<'EOF'
abc'asdf"
$(dont-execute-this)
foo"bar"''
EOF
If you don't quote the variable when you echo it, newlines are lost. Quoting it preserves them:
$ echo "$VAR"
abc'asdf"
$(dont-execute-this)
foo"bar"''
If you want to use indentation for readability in the...
What does java:comp/env/ do?
...work.jndi.JndiObjectFactoryBean">
<property name="jndiName" value="foo"/>
</bean>
Then you can access it directly using:
Context ctx = new InitialContext();
DataSource ds = (DataSource)ctx.lookup("java:comp/env/foo");
or you could make an intermediate step so you don't have to ...
Pointers in C: when to use the ampersand and the asterisk?
...ment, the function will receive a pointer, not an array:
int arr[10];
...
foo(arr);
...
void foo(int *arr) { ... }
This is why you don't use the & operator for arguments corresponding to "%s" in scanf():
char str[STRING_LENGTH];
...
scanf("%s", str);
Because of the implicit conversion, sc...
Display filename before matching line
... That's important if you are using grep with find, like find . -name foo -exec grep pattern {} \; - assuming plenty of files named foo in your subdirectory, find still hands grep a single file to operate on at a time. The /dev/null trick seems to work in all linux/osx flavors that I've tried,...
How does collections.defaultdict work?
...ment can be any callable object - not just type functions. For example if foo was a function that returned "bar", foo could be used as an argument to default dict and if a non-present key was accessed, its value would be set to "bar".
– lf215
Jul 29 '13 at 5:5...
How to emulate C array initialization “int arr[] = { e1, e2, e3, … }” behaviour with std::array?
...ove construction when make_array sets up the initializer. So std::array<Foo,2> x{Foo(1), Foo(2)}; has no copy/move, but auto x = make_array(Foo(1), Foo(2)); has two copy/moves as the arguments are forwarded to make_array. I don't think you can improve on that, because you can't pass a variadic...
Query-string encoding of a Javascript Object
...p]));
}
return str.join("&");
}
console.log(serialize({
foo: "hi there",
bar: "100%"
}));
// foo=hi%20there&bar=100%25
Edit: this one also converts recursive objects (using php "array" notation for the query string)
serialize = function(obj, prefix) {
var s...
How do I parse JSON with Ruby on Rails? [duplicate]
...similarity of the [] method.
Here are some examples:
hash_of_values = {'foo' => 1, 'bar' => 2}
array_of_values = [hash_of_values]
JSON[hash_of_values]
# => "{\"foo\":1,\"bar\":2}"
JSON[array_of_values]
# => "[{\"foo\":1,\"bar\":2}]"
string_to_parse = array_of_values.to_json
JSON[...
difference between #if defined(WIN32) and #ifdef(WIN32)
...
#ifdef FOO
and
#if defined(FOO)
are the same,
but to do several things at once, you can use defined, like
#if defined(FOO) || defined(BAR)
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