Tutorial by Examples: b

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To create a build target producing an executable, one should use the add_executable command: add_executable(my_exe main.cpp utilities.cpp) This creates a build target, e.g. make my_exe for GNU make, with the appropriate invocations of the configured compiler to pr...

To create an build target that creates an library, use the add_library command: add_library(my_lib lib.cpp) The CMake variable BUILD_SHARED_LIBS controls whenever to build an static (OFF) or an shared (ON) library, using for example cmake .. -DBUILD_SHARED_LIBS=ON. However, you can explicitly se...

(Collects 2-3 inputs and combines them into a Tuple) Like BatchBlock, JoinBlock<T1, T2, …> is able to group data from multiple data sources. In fact, that’s JoinBlock<T1, T2, …>’s primary purpose. For example, a JoinBlock<string, double, int> is an ISourceBlock<Tuple<strin...

(Copy an item and send the copies to every block that it’s linked to) Unlike BufferBlock, BroadcastBlock’s mission in life is to enable all targets linked from the block to get a copy of every element published, continually overwriting the “current” value with those propagated to it. Additionally,...

(Readonly variable: Memorizes its first data item and passes out copies of it as its output. Ignores all other data items) If BufferBlock is the most fundamental block in TPL Dataflow, WriteOnceBlock is the simplest. It stores at most one value, and once that value has been set, it will never be r...

(Collects a certain number of total items from 2-3 inputs and groups them into a Tuple of collections of data items) BatchedJoinBlock<T1, T2,…> is in a sense a combination of BatchBlock and JoinBlock<T1, T2,…>. Whereas JoinBlock<T1, T2,…> is used to aggregate one input from each ...

(Select, one-to-one) As with ActionBlock, TransformBlock<TInput, TOutput> enables the execution of a delegate to perform some action for each input datum; unlike with ActionBlock, this processing has an output. This delegate can be a Func<TInput, TOutput>, in which case processing of t...

(foreach) This class can be thought of logically as a buffer for data to be processed combined with tasks for processing that data, with the “dataflow block” managing both. In its most basic usage, we can instantiate an ActionBlock and “post” data to it; the delegate provided at the ActionBlock’s c...

(SelectMany, 1-m: The results of this mapping are “flattened”, just like LINQ’s SelectMany) TransformManyBlock<TInput, TOutput> is very similar to TransformBlock<TInput, TOutput>. The key difference is that whereas a TransformBlock<TInput, TOutput> produces one and only one outpu...

(Groups a certain number of sequential data items into collections of data items) BatchBlock combines N single items into one batch item, represented as an array of elements. An instance is created with a specific batch size, and the block then creates a batch as soon as it’s received that number o...

(FIFO Queue: The data that comes in is the data that goes out) In short, BufferBlock provides an unbounded or bounded buffer for storing instances of T. You can “post” instances of T to the block, which cause the data being posted to be stored in a first-in-first-out (FIFO) order by the block. Yo...

Dim sites() As String = {"Stack Overflow", "Super User", "Ask Ubuntu", "Hardware Recommendations"} Dim query = From x In sites Select x.Length ' result = 14, 10, 10, 24 Query...

Public Function GetUserFirstName(UserName As String) As String Dim Firstname As String = "" 'Specify the SQL that you want to use including a Parameter Dim SQL As String = "select firstname from users where username=@UserName" 'Provide a Data Sourc...

Variables are SHADOWED and methods are OVERRIDDEN. Which variable will be used depends on the class that the variable is declared of. Which method will be used depends on the actual class of the object that is referenced by the variable. class Car { public int gearRatio = 8; public St...

Casting an instance of a base class to a subclass as in : b = (B) a; is called narrowing (as you are trying to narrow the base class object to a more specific class object) and needs an explicit type-cast. Casting an instance of a subclass to a base class as in: A a = b; is called widening and does...

Random and ThreadLocalRandom are good enough for everyday use, but they have a big problem: They are based on a linear congruential generator, an algorithm whose output can be predicted rather easily. Thus, these two classes are not suitable for cryptographic uses (such as key generation). One can ...

Drag 1 textbox and 1 button Double click the button1 and you will be transferred to the Button1_Click event Public Class Form1 Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click End Sub End Class Type the name of the object that you want to target, ...

/** * returns a array of random numbers with no duplicates * @param range the range of possible numbers for ex. if 100 then it can be anywhere from 1-100 * @param length the length of the array of random numbers * @return array of random numbers with no duplicates. */ public static int[] ...

Creating backpressured data sources is the relatively easier task when dealing with backpressure in general because the library already offers static methods on Observable that handle backpressure for the developer. We can distinguish two kinds of factory methods: cold "generators" that ei...