Tutorial by Examples: d

C++11 struct info_type { std::string name; int age; float height; // we define an overload of operator>> as a friend function which // gives in privileged access to private data members friend std::istream& operator>>(std::istream& is, info_...

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Use Do...Loop to repeat a block of statements While or Until a condition is true, checking the condition either at the beginning or at the end of the loop. Dim x As Integer = 0 Do Console.Write(x & " ") x += 1 Loop While x < 10 or Dim x As Integer = 0 Do While x &l...

cdecl is a Windows 32-bit function calling convention which is very similar to the calling convention used on many POSIX operating systems (documented in the i386 System V ABI). One of the differences is in returning small structs. Parameters Parameters are passed on the stack, with the first arg...

stdcall is used for 32-bit Windows API calls. Parameters Parameters are passed on the stack, with the first parameter closest to the top of the stack. The callee will pop these values off of the stack before returning. Return Value Scalar return values are placed in EAX. Saved and Clobbered Re...

<svg width="900px" height="400px" viewBox="0 0 900 400"> <defs> <filter id="xAxisGaussian"> <feGaussianBlur stdDeviation="5 0"/> </filter> </defs> <image xlink:href=...

// Get the battery API navigator.getBattery().then(function(battery) { console.log( "Battery will get fully charged in ", battery.chargingTime, " seconds" ); });

This inserts a json dictionary where one of the members is an array of strings into the table that was created in another example. INSERT INTO myjson(dict) VALUES('{"opening":"Sicilian","variations":["pelikan","dragon","najdorf"]}'); ...

In the previous example we saw how mixed data types can be inserted into a JSON field. What if we want to update that field? We are going to add scheveningen to the array named variations in the previous example. UPDATE myjson SET dict=JSON_ARRAY_APPEND(dict,'$.variations','schevening...

DELIMITER $$ DROP PROCEDURE IF EXISTS sp_nested_loop$$ CREATE PROCEDURE sp_nested_loop(IN i INT, IN j INT, OUT x INT, OUT y INT, INOUT z INT) BEGIN DECLARE a INTEGER DEFAULT 0; DECLARE b INTEGER DEFAULT 0; DECLARE c INTEGER DEFAULT 0; WHILE a < i DO WHILE b <...

In Java (and other languages), using null is a common way of indicating that there is no value attached to a reference variable. In Scala, using Option is preferred over using null. Option wraps values that might be null. None is a subclass of Option wrapping a null reference. Some is a subclass of...

Shaded region below a line import matplotlib.pyplot as plt # Data x = [0,1,2,3,4,5,6,7,8,9] y1 = [10,20,40,55,58,55,50,40,20,10] # Shade the area between y1 and line y=0 plt.fill_between(x, y1, 0, facecolor="orange", # The fill color color='...

Send a 304 Not Modified response status from the server send in response to a client request that contains headers If-Modified-Since and If-None-Match, if the request resource hasn’t changed. For example if a client request for a web page includes the header If-Modified-Since: Fri, 22 Jul 2016 14:3...

In normal mode, move the cursor to any word then press * to search forwards for the next occurrence of the word under the cursor, or press # to search backwards. * or # search for the exact word under the cursor: searching for big would only find big and not bigger. Under the hood, Vim uses a sim...

The :global command already has its own topic: The global command

You can open a new split within Vim with the following commands, in normal mode: Horizontally: :split <file name> :new Vertically: :vsplit <file name> :vnew split will open the file in a new split at the top or left of your screen (or current split.) :sp and :vs are convenie...

A lexer rule can have associated commands: WHITESPACE: [ \r\n] -> skip; Commands are defined after a -> at the end of the rule. skip: Skips the matched text, no token will be emited channel(n): Emits the token on a different channel type(n): Changes the emitted token type mode(n), pu...

A lexer action is a block of arbitrary code in the target language surrounded by {...}, which is executed during matching: IDENTIFIER: [A-Z]+ { log("matched rule"); }; A semantic predicate is a block of arbitrary code in the target language surrounded by {...}?, which evaluates to a bo...

if we want to change the Controllers directory we need: Move and/or rename the default Controllers directory where we want it. For example from app/Http/Controllers to app/Controllers Update all the namespaces of the files inside the Controllers folder, making they adhere to the new path, re...