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1. How do I differentiate between macro names and macro strings in a macro definition? What should I pay attention to for macros with parameters? In a macro definition, the macro name and macro string are distinguished by spaces. When the compiler is working on a macro definition, first read the string from the first space after "#define" until the next space is

The database schema definition language DDL (Data Description Language) is the language used to describe the real-world entities to be stored in the database. A database schema contains descriptive definitions for all entities in the database. These definitions include the structure definition, the operation method definition, and so on. The pattern of DDL descr

Just learn to use Python, especially when looking at some library source code, often see Func (*args, **kwargs) Such a function definition, this * and * * is a bit confusing. In fact, as long as the function parameter definition is clear, it is not difficult to understand.Let's start with the function definition, as we all know, the following code defines a funct

The monkey's notes are reprinted. Please indicate the source. I. Definition 1. Define nodes.Node nε g (P) is the definition node of variable vε v. It is recorded as def (v, n ), if and only when the value of variable V is defined at the statement segment of the corresponding node N. 2. Use nodes.Node n' g (P) is the use node of the variable vε v. It is recorded as use (v, n ), if and only when the value of

Today, I carefully studied the definition of natural numbers that I have never really understood before in set theory and graph theory, and wrote down my own understanding. What is a natural number? We all know that a natural number is a set {0, 1, 2, 3... N ,...}, this definition gives natural numbers a perceptual description that is sufficient in daily life. However, in mathematics, the

The declaration and definition of a function should be well differentiated. A function header is also called an implementation. Today, we suddenly feel that we need to think about our lives and definitions. VC should be slightly different from C. Variable declaration in C #. For example, if int I is in Class A, it is just Declaration, so the value assignment is called definition? Then, after the class d

Differences between the two implementations of JS class definition prototype methods many of us know that it is very easy to add prototype methods to JavaScript classes. The following two methods are commonly used. Are there any differences between the two methods? JScript Class: The code is as follows: Function JSClass (){} Extends prototype method: The code is as follows: JSClass. prototype. MethodA = function (){}; Or The code is as follows:

1, query the metadata of the UDF through the sys.sql_modules and sys.objects Fields OBJECT_ID AssociationSELECTO.object_id, O.name, O.type,o.type_desc, M.definition,m.is_schema_bound fromSys.sql_modules asmInner JOINSys.objects aso onM.object_id =O.object_id whereO.typeinch('FN','IF','TF')GO Determine the type of Object field:typeFN = SQL scalar functionIF = SQL inline table-valued functionTF = SQL table-valued-function sys.sql_modules: Returns a row for each object this is an SQL language-defi

This is a creation in Article, where the information may have evolved or changed. Reference Web address: http://topic.csdn.net/t/20050222/14/3797843.html Today, a VC project copies a copy to the current folder to save, and the VC opened the copy of the project began to modify the program, found in the use of the header file using go To definition, often jump to the copy of the project source file, rather than the current source file. In addition, re

This is a creation in Article, where the information may have evolved or changed. Today, a VC project copies a copy to the current folder to save, and the VC opened the copy of the project began to modify the program, found in the use of the header file using go To definition, often jump to the copy of the project source file, rather than the current source file. In addition, remember the previous use of VC also often appear go to

Article from: http://www.aintnot.com/2016/02/10/understanding-phps-internal-function-definitions-ch Original: https://nikic.github.io/2012/03/16/Understanding-PHPs-internal-function-definitions.html Welcome to the second part of the "PHP Source for PHP developers" series.In the previous article, Ircmaxell explained where you can find the source code for PHP, its basic directory structure, and simply introduces some C languages (because PHP is written in C). If you miss the article, mayb

In complex association operations, if you want to add optional attributes to the association definition, we can take a fully defined approach. The fully defined format is: protected $_link = Array (' Associative table name 1 ' = = Array (' The table is associated with the property 1 ' = ' = ' = ' = ' = ' = ' = ', ' The table is associated with the property n ' = ') Define ', '), ' Association table name 2 ' = = Array (' The table is associated with a

1. Defining variables can cause construction and destruction overheadWhenever you define a variable of a type: when the control flow reaches the defined point of the variable, you introduce the overhead of calling the constructor, and when you leave the scope of the variable, you introduce the overhead of calling the destructor. There is also a cost to unused variables, so avoid this definition as much as possible.2. The variable definitions in the no

Ask a question:Consider a template:Template There are several ways to define the following. What is right (by compiling)? Template In order not to affect the analysis of inference, I put the answer color into a lighter color, the following is the answer: Template Template Template Template Template Template Question Answer:First, explain the three correct answers.The first form is called the definition of specif

be like this: man. BestFriend. Name. Why can't we let ourselves define the data structure in the most efficient way? This is what we need to talk about in this article, but I am not thinking deeply. So I hope you can come and talk with me. Generally, an application can be divided into at least three layers: interface layer, business layer, and data layer. Our current object definition is basically only considered at the data layer, that is, the objec

when you create a process, you often use the type definition of the process number: pid_t. We all know that this type definition is actually an int type. But how is this definition defined in the header file in C under Linux? Today, the process of finding this definition has been posted:1. First, the following definiti

Precompilation is the first step in the entire compilation process and is the result of the g++-e option output. This step deals with the macros in the source file/header file, which are commonly used in the following categories: file contains: #include macro definition: #define, #undef conditional compilation: #ifdef, #ifndef, #if, #elif, #else, #endif, 1. file contains #include Preprocessing will include the contents of the file to be included, such

Referenced from SQL Server internals“As views, these metadata objects is based on an underlying Transact-SQL (T-SQL) defnition. The most straightforward-of-the-defnition of these views are by using the Object_defnition function. (You can also see the defnition of these system views by using sp_helptext or by selecting from the catalog view Sys.syste M_sql_modules.) The defnition of Sys.tables, you can execute the following:SELECT object_definition (object_id (' sys.tables '));”Method One:Object_

The difference between a variable's definition and a declarationFirst, the definition of a variable must occur before the variable declaration (extern), the declaration of a variable can have more than one, but the definition of the variable is only one, the declaration of the variable affects the reference and scope of the variable, and the

To understand the definition and execution of JavaScript functions, you need to know these important concepts first, and now you can understand them later!the execution environment of the function (Excution context), the active object (call object), scope (scope), scope chain (scope chain). Next, let's take this function as an example to analyze:Steps:1. Set the scope chainWhen you define function A, the JS interpreter willScope Chain (scope chain)Set