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Stack, Static, and Heap in C++
...rage duration. in global namespace scope
string globalA;
int main() {
foo();
foo();
}
void foo() {
// static storage duration. in local scope
static string localA;
localA += "ab"
cout << localA;
}
The program prints ababab, because localA is not destroyed upon exit ...
Is JSON Hijacking still an issue in modern browsers?
...iginal;
if (isOn) {
Object.defineProperty(Object.prototype, 'foo', {set: capture});
} else {
delete Object.prototype.foo;
}
};
toggle.addEventListener('click', toggleCapture);
toggleCapture();
[].forEach.call(document.body.querySelectorAll('input[type="butt...
How to assign name for a screen? [closed]
...
To create a new screen with the name foo, use
screen -S foo
Then to reattach it, run
screen -r foo # or use -x, as in
screen -x foo # for "Multi display mode" (see the man page)
s...
Replace comma with newline in sed on MacOS?
...essions (as mine tends to be), you can also use perl -pe instead
$ echo 'foo,bar,baz' | perl -pe 's/,/,\n/g'
foo,
bar,
baz
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Installing Python 3 on RHEL
...nstall-3.4 pip
You can create your virtualenv using pyvenv:
pyvenv /tmp/foo
[EPEL] How to install Python 3.6 on CentOS 7
With CentOS7, pip3.6 is provided as a package :)
sudo yum install -y epel-release
sudo yum install -y python36 python36-pip
You can create your virtualenv using pyvenv:
...
What does denote in C# [duplicate]
...le only allows you to invoke the method with types that are classes:
void Foo<T>(T item) where T: class
{
}
The following example only allows you to invoke the method with types that are Circle or inherit from it.
void Foo<T>(T item) where T: Circle
{
}
And there is new() that says...
How do you add a Dictionary of items into another Dictionary
...ith another one.
You can write an extension to do it
var dict1 = ["a" : "foo"]
var dict2 = ["b" : "bar"]
extension Dictionary {
mutating func update(other:Dictionary) {
for (key,value) in other {
self.updateValue(value, forKey:key)
}
}
}
dict1.update(dict2)
//...
Getting the array length of a 2D array in Java
...
Consider
public static void main(String[] args) {
int[][] foo = new int[][] {
new int[] { 1, 2, 3 },
new int[] { 1, 2, 3, 4},
};
System.out.println(foo.length); //2
System.out.println(foo[0].length); //3
System.out.println(foo[1].length); //4
}
Col...
Rails: What's a good way to validate links (URLs)?
...owing host
http://invalid##host.com
but it will allow
http://invalid-host.foo
that is a valid host, but not a valid domain if you consider the existing TLDs. Indeed, the solution would work if you want to validate the hostname, not the domain because the following one is a valid hostname
http://ho...
ActiveRecord OR query
.../ActiveRecord may support this syntax natively. It would look similar to:
Foo.where(foo: 'bar').or.where(bar: 'bar')
As noted in this pull request https://github.com/rails/rails/pull/9052
For now, simply sticking with the following works great:
Foo.where('foo= ? OR bar= ?', 'bar', 'bar')
Upda...