Tutorial by Examples: def

The typedef keyword is a specifier, so it applies separately to each declarator. Therefore, each name declared refers to the type that that name would have in the absence of typedef. int *x, (*p)(); // x has type int*, and p has type int(*)() typedef int *x, (*p)(); // x is an alias for in...

Is raised when you tried to use a variable, method or function that is not initialized (at least not before). In other words, it is raised when a requested local or global name is not found. It's possible that you misspelt the name of the object or forgot to import something. Also maybe it's in anot...

new Vue({ el:"#app", data:{ foo: "bar" }, methods:{ // This is wrong! Arrow functions capture "this" lexically // and "this" will refer to the window. doSomething: () => this.foo = "baz" } })

new Vue({ el:"#app", data:{ foo: "bar" }, methods:{ doSomething: function(){ this.foo = "baz" } } }) Alternatively, if you are using a javascript compiler or a browser that supports Ecmascript 2015 new Vue({ el:"#app&quo...

In general, MIDI protocol is broken down into "messages". There are 4 general classes of messages: Channel Voice Channel Mode System Common System Real-Time Messages Messages start with a byte value above 0x80. Any value below 0x7F is considered data. Effectively meaning that 1...

Screenshot Adapter Class private class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> { final int EMPTY_VIEW = 77777; List<CustomData> datalist = new ArrayList<>(); MyAdapter() { super(); } @Override public RecyclerView.ViewHolder onCreateViewH...

Menus act like all standard control items. They have an action which is the function to be called and a target which is the object to send the function to. If the target is set to an object then when a user selects a menu item it the action method will be sent to the target object. If the menu item ...

By leveraging some of the member variables in the GridLayout instance, we can change the margins around the layout, and spacing between cells. In this example we set the following: verticalSpacing = 0 - Sets the vertical spacing between cells to 0px. horizontalSpacing = 20 - Sets the horizontal ...

To illustrate this, here is a function that has 3 different "wrong" behaviors parameter is completely stupid: we use a user-defined expression parameter has a typo: we use Oracle standard NO_DATA_FOUND error another, but not handled case Feel free to adapt it to your standards: DE...

Just use default DividerItemDecoration class : NavigationView navigationView = (NavigationView) findViewById(R.id.navigation); NavigationMenuView navMenuView = (NavigationMenuView) navigationView.getChildAt(0); navMenuView.addItemDecoration(new DividerItemDecoration(context,DividerItemDecoration....

The keyword function can be used to initiate pattern-matching on the the last argument of a function. For example, we can write a function called sum, which computes the sum of a list of integers, this way let rec sum = function | [] -> 0 | h::t -> h + sum t ;; val sum : int list -&...

1) IP based vhosts <VirtualHost 192.168.13.37> ServerName example.com DocumentRoot /var/www/domains/example.com/html ErrorLog /var/log/example.com/error.log CustomLog /var/log/example.com/access.log common </VirtualHost> <VirtualHost 192.168.47.11> ...

I won't repeat it all here: "Application Default Credentials provide a simple way to get authorization credentials for use calling Google APIs." If you can use Application Default Credentials, do. There is an extra step you will need to perform the before first using Application Default ...

The following 4 properties are available for PXSelector and PXSegmentMask input controls to define size range for a drop-down window: MinDropWidth: gets or sets the minimum drop-down control width MinDropHeight: gets or sets the minimum drop-down control height MaxDropWidth: gets or sets the ma...

I won't repeat it all here: "Application Default Credentials provide a simple way to get authorization credentials for use calling Google APIs." If you can use Application Default Credentials, do. There is an extra step you will need to perform the before first using Application Default ...

To reveal the default "root" password: shell> sudo grep 'temporary password' /var/log/mysqld.log Change the root password as soon as possible by logging in with the generated temporary password and set a custom password for the superuser account: shell> mysql -uroot -p mysql...

(defn x [a b] (* a b)) ;; public function => (x 3 2) ;; 6 => (x 0 9) ;; 0 (defn- y [a b] (+ a b)) ;; private function => (x (y 1 2) (y 2 3)) ;; 15

Consider next example: public interface A { default void foo() { System.out.println("A.foo"); } } public interface B { default void foo() { System.out.println("B.foo"); } } Here are two interfaces declaring default method foo with the same signature. If you wi...

public class DependentScopedClass { //This class has no scoping annotations, so a new instance gets created at every injection point. @Inject public DependentScopedClass(SomeDependency someDependency) { doSomethingWith(someDependency); } } The default scope for...

By default, the scope is public, the value can be accessed from anywhere. package com.example { class FooClass { val x = "foo" } } package an.other.package { class BarClass { val foo = new com.example.FooClass foo.x // <- Accessing a public value from anothe...