Tutorial by Examples: er

If you need to select between several options, enabling just one via enable_if<> can be quite cumbersome, since several conditions needs to be negated too. The ordering between overloads can instead be selected using inheritance, i.e. tag dispatch. Instead of testing for the thing that ne...

This is the typical approach for novice developers building SQL action queries. They are vulnerable to the Bobby Tables type SQL Injection attacks. Dim strSQL As String strSQL = "INSERT INTO Employees chrFirstName, chrLastName, chrPhone " _ & "VALUES ('" & M...

This approach will prevent a user from embedding a second SQL statement in their input for execution. Dim strSQL As String Dim db As DAO.Database Dim qdf As DAO.QueryDef strSQL = "PARAMETERS [FirstName] Text(255), [LastName] Text(255), [Phone] Text(255); " _ & "INS...

UILabel, UITextField, & UITextView classes have a new property starting from iOS 10 for automatically resizing their font when a user changes their preferred reading size named adjustsFontForContentSizeCategory. Swift @IBOutlet var label:UILabel! if #available(iOS 10.0, *) { label.adju...

To use MQTT in the application we have variety of Libraries available for different programming languages. MQTT Library LIBRARYLANGUAGEDESCRIPTIONEclipse PahoC, C++, Java, Javascript, Python, Go, C#Paho clients are among the most popular client library implementations.Fusesource MQTT ClientJa...

Go to ActiveMQ Website and download latest stable version of activeMQ click here to activeMQ downloads after downloading, unzip it if you're using windows 32 Go to apache-activemq-5.14.3\bin\win32 if windows 64 apache-activemq-5.14.3\bin\win64 run the activemq batch file thats it...

create Dynamic web project in sts/eclipse download the eclipse paho jar from click here to download and paste jar file in webcontent->webinf->folder->lib Publish Example String broker = "tcp://localhost:1883"; String topicName = "test/topic"; int qos = 1; Mqt...

struct UnsafeMutablePointer<Pointee> A pointer for accessing and manipulating data of a specific type. You use instances of the UnsafeMutablePointer type to access data of a specific type in memory. The type of data that a pointer can access is the pointer's Pointee type. UnsafeMutable...

Deconstructing the use of an unsafe pointer in the Swift library method; public init?(validatingUTF8 cString: UnsafePointer<CChar>) Purpose: Creates a new string by copying and validating the null-terminated UTF-8 data referenced by the given pointer. This initializer does not try to rep...

extension Dictionary { func merge(dict: Dictionary<Key,Value>) -> Dictionary<Key,Value> { var mutableCopy = self for (key, value) in dict { // If both dictionaries have a value for same key, the value of the other dictionary is used. mu...

Create a workspace mkdir -p ~/catkin_ws/src cd ~/catkin_ws/src catkin_init_workspace Build your workspace cd ~/catkin_ws/ catkin_make Source your setup file source devel/setup.bash Create a new package named hello_world with some basic dependencies catkin_create_pkg hello_world std_m...

An Albers projection, or more properly, an Albers equal area conic projection, is a common conical projection and an official projeciton of a number of jurisdictions and organizations such as the US census bureau and the province of British Columbia in Canada. It preserves area at the expense of oth...

I use Spring Boot 1.4.4.RELEASE , with MySQL as the Database and Spring Data JPA abstraction to work with MySQL. Indeed ,it is the Spring Data JPA module that makes it so easy to set up Pagination in a Spring boot app in the first place. Scenario expose an endpoint /students/classroom/{id} . It wi...

By default STI model class name is stored in a column named type. But its name can be changed by overriding inheritance_column value in a base class. E.g.: class User < ActiveRecord::Base self.inheritance_column = :entity_type # can be string as well end class Admin < User; end Migr...

Create setup script ~/.perlbrew.sh: # Reset any environment variables that could confuse `perlbrew`: export PERL_LOCAL_LIB_ROOT= export PERL_MB_OPT= export PERL_MM_OPT= # decide where you want to install perlbrew: export PERLBREW_ROOT=~/perlbrew [[ -f "$PERLBREW_ROOT/etc/bashrc" ]...

<!-- All boilerplate for now --> <Application xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"> <Application.Resources> </Application.Reso...

As of Salt version 2014.1.0, Salt uses a date based system for version numbers. Version numbers are in the format YYYY.MM.R. The year (YYYY) and month (MM) indicate when the release was created. The bugfix release number (R) increments within that feature release. In order to distinguish future rel...

Let's say we want to move a given date a numof months. We can define the following function, that uses the mondate package: moveNumOfMonths <- function(date, num) { as.Date(mondate(date) + num) } It moves consistently the month part of the date and adjusting the day, in case the date re...

To get a list of the service on your system, you may run: service --status-all The output of service --status-all lists the state of services controlled by System V. The + indicates the service is running, - indicates a stopped service. You can see this by running service SERVICENAME status for...

package main import ( "k8s.io/kubernetes/pkg/api" unver "k8s.io/kubernetes/pkg/api/unversioned" "k8s.io/kubernetes/pkg/apis/extensions" "k8s.io/kubernetes/pkg/client/restclient" client "k8s.io/kubernetes/pkg/client/unversioned&...