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What is the equivalent of “none” in django templates?
...all are available within template tags and filters. None, False, the empty string ('', "", """""") and empty lists/tuples all evaluate to False when evaluated by if, so you can easily do
{% if profile.user.first_name == None %}
{% if not profile.user.first_name %}
A hint: @fabiocerqueira is right...
What makes JNI calls slow?
...code requires something similar to reflection. Signatures are specified in strings and queried from the JVM. This is both slow and error-prone.
Java Strings are objects, have length and are encoded. Accessing or creating a string may require an O(n) copy.
Some additional discussion, possibly dated...
Configuring Vim for C++
...or example :
abbreviate bptr boost::shared_ptr
abbreviate cstr const std::string &
I have several functions for "code snippets" like things, for example :
function! IncludeGuard()
let basename = expand("%:t:r")
let includeGuard = '__' . basename . '_h__'
call append(0, "#ifndef " . incl...
Fetch first element which matches criteria
... */)
.findFirst()
.get();
An example:
public static void main(String[] args) {
class Stop {
private final String stationName;
private final int passengerCount;
Stop(final String stationName, final int passengerCount) {
this.stationName = st...
Error “initializer element is not constant” when trying to initialize variable with const
...n object that has static storage duration shall be constant expressions or string literals.
In section 6.6, the spec defines what must considered a constant expression. No where does it state that a const variable must be considered a constant expression. It is legal for a compiler to extend thi...
How to use custom packages
...es\Fiboo\Client.go
package Fiboo
type Client struct{
ID int
name string
}
on file MyProject\main.go
package main
import(
Fiboo "./Entity/Fiboo"
)
var TableClient Fiboo.Client
func main(){
TableClient.ID = 1
TableClient.name = 'Hugo'
// do your things here
}
( I a...
What are best practices for using SmtpClient, SendAsync and Dispose under .NET 4.0
...end email asynchronously is as the following:
public async Task SendEmail(string toEmailAddress, string emailSubject, string emailMessage)
{
using (var message = new MailMessage())
{
message.To.Add(toEmailAddress);
message.Subject = emailSubject;
message.Body = emai...
Why do all browsers' user agents start with “Mozilla/”?
All popular browsers' user agent strings, even Internet Explorer's, start with Mozilla/ . Why is this the case?
6 Answers
...
How to make modal dialog in WPF?
....Close().
public partial class ModalWindow : Window
{
public static string myValue = String.Empty;
public ModalWindow()
{
InitializeComponent();
}
private void btnSaveData_Click(object sender, RoutedEventArgs e)
{
myValue = txtSomeBox.Text;
...
Clear back stack using fragments
...((AppCompatActivity)getContext()).getSupportFragmentManager().popBackStack(String name, FragmentManager.POP_BACK_STACK_INCLUSIVE)
Which will pop all states up to the named one. You can then just replace the fragment with what you want
...