audacity macro

Write a good-looking macro definition in C language. Using macro definition can prevent errors, improve portability, readability, and convenience. The following lists some macro definitions commonly used in mature software ......1. prevent a header file from being repeatedly contained# Ifndef comdef_h# Define comdef_h// Header file content# Endif2. redefine some

C1 condition include As follows: Code # Ifndef main_h _ # Define main_h _ Other content # Endif When we see the header file, the function is to prevent this header file from being included multiple times. Repeated definitions occur when multiple include operations are performed. Therefore, you must use this definition in each header file. If you still don't know how to use it, you can see the standard header file of C, such as fcntl. h. 2. Conditional compilation As follows: Code # Ifdef _ deb

#define宏定义在C系开发中可以说占有举足轻重的作用. The underlying framework does not have to say, in order to compile optimization and convenience, as well as cross-platform capabilities, macros are heavily used, it can be said that the bottom of development left define will be unable to move. When developing at a higher level, we put more emphasis on business logic and seem to have little use and reliance on macros.But the benefits of using macro definitions are self-exp

Many C + + books have advised us that C-language macros are the root of all evils, but things are not as bad as we think, like Goto. Macros have a big role in automatically generating code for us. If the template can produce various types of code for us (type substitution), then the macro can actually generate new code for us on the symbol (that is, symbol substitution, increment). Some of the syntax questions about macros can be found on Google. Bel

People who are new to MFC programming are often intimidated by various macro definitions and preprocessing commands generated by the MFC wizard. However, preprocessing and macro definition are a powerful tool in C language. They can be used for simple source code control, version control, warning, or some special functions.　　A classic exampleThe most classic example of using preprocessing and

directory of this document Introduction to preprocessing Directives One, macro definition without parameters Second, macro definition with parameters Description: This C language topic is the prelude to learning iOS development. And for programmers with an object-oriented language development experience, you can quickly get started with C language. If you don't have programming experie

Introduction to preprocessing Directives One, macro definition without parameters Second, macro definition with parameters Description: This C language topic is the prelude to learning iOS development. And for programmers with an object-oriented language development experience, you can quickly get started with C language. If you don't have programming experience, or are no

In gnu c, macros can accept variable parameters, just like functions, such:# Define pr_debug (fmt, arg ...)/Printk (KERN_DEBUG fmt, # arg) Use variadic macros to transmit Variable Parameter tables You may be familiar with Using Variable Parameter tables in functions, such: Void printf (const char * format ,...); Until recently, variable parameter tables can only be applied to real functions and cannot be used in macros. The C99 compiler standard has finally changed this situation. It allows you

Http://tech.e800.com.cn/articles/2009/727/1248665385863_1.html Many C ++ books advise us that C language macros are the first of all evil, but things are not as bad as we think, just like Goto. MacroA major role is to automatically generateCode. If the template can generate various types of code (type replacement) for us ),In fact, macros can generate new Code (replacement and addition of symbols) on the symbols ). You can find some macro Synt

Macro definition of C Language notes (1) Symbolic Constants Macro definition is a replacement strategy in C language, that is, using preprocessing commands # define equals a string of (lengthy) texts with a name (macro, then you can batch use Macros in the source code. In the preprocessing phase, replace the macro in t

In the C and C + + languages, an identifier is allowed to represent a string, called a macro, which can be a constant, an expression, a format string, and so on. When compiling preprocessing, all occurrences of the "macro name" in the program are substituted with the string in the macro definition, which is called "macro