Tutorial by Examples: am

std::ostringstream is a class whose objects look like an output stream (that is, you can write to them via operator<<), but actually store the writing results, and provide them in the form of a stream. Consider the following short code: #include <sstream> #include <string> ...

When followed by a qualified name, typename specifies that it is the name of a type. This is often required in templates, in particular, when the nested name specifier is a dependent type other than the current instantiation. In this example, std::decay<T> depends on the template parameter...

This is a basic Hello World program in NASM assembly for 32-bit x86 Linux, using system calls directly (without any libc function calls). It's a lot to take in, but over time it will become understandable. Lines starting with a semicolon(;) are comments. If you don't already know low-level Unix sy...

MSTest (the default testing framework) requires you to have your test classes decorated by a [TestClass] attribute, and the test methods with a [TestMethod] attribute, and to be public. [TestClass] public class FizzBuzzFixture { [TestMethod] public void Test1() { //arrange...

string[] portNames = SerialPort.GetPortNames();

When we use @SpringApplicationConfiguration it will use configuration from application.yml [properties] which in certain situation is not appropriate. So to override the properties we can use @TestPropertySource annotation. @TestPropertySource( properties = { "spring...

The getaddrinfo() function is the recommended POSIX function for interfacing with the system resolver. Depending on system configuration it will perform name lookups in the DNS, /etc/hosts, mDNS, etc. It is preferred over the deprecated gethostbyname() family of functions because it supports both ...

Description The SQL standard provides two additional aggregate operators. These use the polymorphic value "ALL" to denote the set of all values ​​that an attribute can take. The two operators are: with data cube that it provides all possible combinations than the argument attributes o...

For more complex applications, flat execution profiles may be difficult to follow. This is why many profiling tools also generate some form of annotated callgraph information. gperf2dot converts text output from many profilers (Linux perf, callgrind, oprofile etc.) into a callgraph diagram. You can...

This example updates last write time of a huge number of files (using System.IO.Directory.EnumerateFiles instead of System.IO.Directory.GetFiles()). Optionally you can specify a search pattern (default is "*.*" and eventually search through a directory tree (not only the specified director...

This snippet is an helper function to enumerate all files older than a specified age, it's useful - for example - when you have to delete old log files or old cached data. static IEnumerable<string> EnumerateAllFilesOlderThan( TimeSpan maximumAge, ...

It is obvious to assume that the percentage value of margin to margin-left and margin-right would be relative to its parent element. .parent { width : 500px; height: 300px; } .child { width : 100px; height: 100px; margin-left: 10%; /* (parentWidth * 10/100) => 50px ...

Newtonsoft's Json.NET allows you to bind json dynamically (using ExpandoObject / Dynamic objects) without the need to create the type explicitly. Serialization dynamic jsonObject = new ExpandoObject(); jsonObject.Title = "Merchent of Venice"; jsonObject.Author = "William Shakes...

Create a new file in the application/config folder named email.php Set the parameters for sending email. These will load when you send your email. $config['newline'] = "\r\n"; //You must use double quotes on this one $config['protocol'] = 'smtp'; $config['smtp_host'] = 'ssl://smtp.gmai...

There’s no API that can rename the blob file on Azure. This code snippet demonstrates how to rename a blob file in Microsoft Azure Blob Storage. StorageCredentials cred = new StorageCredentials("[Your storage account name]", "[Your storage account key]"); CloudBlobContainer c...

using System; using System.Collections.Generic; using System.Linq; using System.Numerics; // also add reference to System.Numberics namespace ConsoleApplication33 { class Program { private static IEnumerable<BigInteger> Fibonacci() { BigInteger p...

To Illustrate the MERGE Statement, consider the following two tables - dbo.Product : This table contains information about the product that company is currently selling dbo.ProductNew: This table contains information about the product that the company will sell in the future. The foll...

Tuples can be used to return multiple values from a method without using out parameters. In the following example AddMultiply is used to return two values (sum, product). void Write() { var result = AddMultiply(25, 28); Console.WriteLine(result.Item1); Console.WriteLine(result.Item2...

Most of the guidance for creating good examples for Q&A carries over into the documentation. Make it minimal and get to the point. Complications and digressions are counterproductive. Include both working code and prose explaining it. Neither one is sufficient on its own. Don't re...

// 1. Base example not using language support for covariance, dynamic type checking. class Top { public: virtual Top* clone() const = 0; virtual ~Top() = default; // Necessary for `delete` via Top*. }; class D : public Top { public: Top* clone() const override ...