define defragment

This article is guided by:C # preprocessor directives are never translated into executable code commands, but can affect all aspects of the compilation process, common preprocessor directives have # define, #undef, #if, #elif, #else和 #endif, and so on, the following describes C # use # Define an instance of conditional compilation.In C #, conditional compilation directives are used to conditionally include

#ifndef the use of #define#endif#ifndef in the fileThe #ifndef of the first piece, this is a very important thing. For example, you have two C files, and these two C files include the same header file. At compile time, these two C files are compiled into a running file together, so the problem comes with a lot of conflicting statements.or the contents of the head file in #ifndef and #endif. Regardless of whether your header file will be referenced by

In php5, const, define, and static 1. in const programming, we generally use constants to define the constant values that cannot be changed during runtime. let's take a look at const in php, there is nothing to say about this, just to improve the knowledge. When defining a constant, we can use const to modify the constant. the constant modified with const is a bit different from other constants: const,

The difference between defining a variable and declaring a variable is that defining an operation that will generate memory allocation./* Module1.h */Int a = 1;/* define int a */In the. h file of Module 1 */ /* Module1.c */# Include "module1.h"/* contains the. h file of Module 1 in Module 1 */ /* Module2.c */# Include "module1.h"/* contains the. h file of Module 1 in Module 2 */ /* Module3.c */# Include "module1.h"/* contains the. h file of Module 1 i

Asynchronous modules define AMD and asynchronous modules amd It is called Asynchronous Module Definition, and is defined by Asynchronous components (or modules. AMD is a mechanism in which components and their dependencies can be asynchronously loaded.Define Method define(id?, dependencies?, factory); Component ID The component ID is the unique identifier of a component. In a script file that is one-to-one

I. Usage of typedef In C/C ++, typedef is often used to define an alias for an identifier and a keyword. It is part of the language compilation process, but it does not actually allocate memory space, such: Typedef int;Typedef int array [10];Typedef (int *) pint; Typedef can be enhancedProgramBut it also has some disadvantages such as "non-intuitive. Ii. # define usage #

Difference between typedef and # define 1. typedef Typedef is the meaning of the type definition, but itInstead of defining a new type, you can create an alias for an existing type., Similar to the meaning of the reference,References are aliases of variables or objects, while typedef defines aliases of types.. Typedef has two main functions: 1.1 simplify complex type declarations Simplify complex type declarations, or give existing types an alias

This article provides a detailed analysis of the differences between const and define in php. For more information, see This article provides a detailed analysis of the differences between const and define in php. For more information, see 1. const is used for defining class member variables. Once defined, the value cannot be changed. Define defines global c

1. Const is used for class member variable definition, once defined and cannot change its value. Define defines global constants that can be accessed everywhere. 2. Define cannot be defined in a class and const can. 3. Const cannot define constants in conditional statements Copy CodeThe code is as follows: if (...) { Const FOO = ' BAR '; Invalid } But if (...) {

Define reference relationships : In this tutorial, each dimension of your cube has been directly linked to a table in the fact data table of the measurement value group based on the relationship between the primary key and the foreign key. In Lesson 3rd and lesson 4th, you will not directly link to a table (called a snowflake table) in a fact data table) the dimension attribute in is included in the dimension that is directly linked to the fact da

We all know that define is defined as constants, what if constants are defined in the class? Certainly cannot use define, but uses the const, the following example: The code is as follows Copy Code define (' php ', ' I love php ');////Outside the class usually defines constants if (defined (' php ')) { echo ' php is defined! ' ; T

The use of define is only a pure substitution function, and the substitution of the macro definition is the replacement that the preprocessor handles. One: Simple macro-definition usage Formatting: Replacing content with #define Identifiers The replacement can be numbers, characters, strings, special characters, and spaces, and what will be replaced with what is behind it. For example: #

When writing a program, we often encounter a problem where we need to write a lot of the same code, and the code structure is the same. Always want to encapsulate this code and then call directly, but if this code logic is not complex, and the amount of code is not suitable for encapsulation, then we will think of C + + keyword define. In fact, it is wise of you to meet the above situation and think of something else----template, and we'll talk about

Understanding # define sreg (* (volatile unsigned char *) 0x5f) Understanding # define sreg (* (volatile unsigned char *) 0x5f)This definition is always very strange. I don't know why. I have a little bit of experience today. Please submit more bricks to the prawns ~~~ Embedded system programming requires programmers to use C language to access a fixed memory address. Since it is an address, according to

using the multi-dimensional dataset wizard, you can easily define a simple multi-dimensional dataset in SQL Server 2005. This wizard helps you define measurement values and dimensions for cubes. In this wizard, you can define a multi-dimensional dataset based on the data source, or you can define a multi-dimensional da

PHP uses the Define () function to define a constant. The so-called constant refers to the value of the amount of constant, this article collects a few about the PHP constants of the article, I hope that you understand the PHP constants help, come together to see it. The definition of 1.PHP constants and the use of examples to explain constants we can understand as the amount of constant value. Constants ar

Transferred from: http://www.cnblogs.com/kerwinshaw/archive/2009/02/02/1382428.htmlI. Usage of typedefA typedef is commonly used to define an identifier and an alias for a keyword in the C + + language, which is part of the language compilation process, but it does not actually allocate memory space, such as:typedef int INT;typedef int ARRAY[10];typedef (INT*) PINT;typedef can enhance the readability of the program, as well as the flexibility of ident

First, preprocessing commands he is not a constant!!!! Let's look at a piece of code #define @ "Avatar" if (false) { #define AVATAR @ " NSLog"} (Avatar); How much does this code output, we define "avatar" for 60, and then redefine "Avatar" in a code that never executes, the code in theif statement never executes, but at compile time , the compi

Original address: http://blog.csdn.net/xiaogou56a/article/details/21340213Define used to define modulesRequire used to load modules1Because defining a module may depend on other modules, and of course the simplest case is to not rely on other modules, then you can write:[JavaScript]View Plaincopy Inside file My/shirt.js: Define ({ Color: "Black", Size: "Unisize" }); Official ex

We often see a lot of great apps with some very beautiful controls, and the user experience is great. For example, ToggleButton is a very good example, the iOS system below the exquisite ToggleButton now can be implemented under Android, but also can define its own color text background, make a variety of beautiful switch button out.Here is a more often used technology in Android-Define your own controls.Le