slack macros

expansionThe preprocessor expands the macro reference that appears in the source program file into the corresponding macro definition, which is what this article describes as the function of # define, which is done by the preprocessor.The source program processed by the preprocessor differs from the previous source program, where the work performed is purely a substitution and unwinding, without any computational function, so as long as you can really understand this when learning the # define

Objective:1) output log is a large loss of system performance2) The information that is output is easily intercepted, causing the information to be unsafe.So we're going to cancel all of the logs in the release version (release). It is obviously not a clear choice if you are going to comment out the log one line at a line.So we can use macros to customize the log output.One of the simplest examples:#ifdef debug# define Gclog (FMT, ...) NSLog (FMT), #

string during C program Compilation # Define max (A, B) (a)> (B ))? (A) :( B) 5. Macro limitations 1. Macros cannot access private members of objects. 2. The definition of macros is prone to ambiguity. Example of ambiguity: # Define table_multi (x) (x * X) Table_multi (10) // 100 is returned, which is correct. Table_multi (10 + 10) // The expected result is 400, while the macro call result is (10 + 10*1

Http://www.dotnetperls.com/post-pre-build-macros You need to use post-build and pre-buildMacrosIn Microsoft Visual Studio 2008. You may have two projects that rely on each other but are separate. We can write a macro to copy files from one project to another after the first one is built. This page provides an example of using build macros with a DLL in Visual Studio.

For the original article, see here Macro, a small piece namedCode. InProgramWhen this name is referenced elsewhere, the compiler will automatically replace it with macro content. There are two types of macros. Their differences are mostly manifested in the Code:Object-likeMacros refer to objects, whileFunction-likeMacro refers to function call. You can define any valid identifier as a macro, connectedC LanguageCan also be reserved, because the Prepr

Using Microsoft-specific predefined Preprocessor macros A sample function that uses ANSI-compliant predefined Preprocessor macros: bool CPreprocessingDlg::UseMicrosoftSpecificPredefinedMacros(void){ // Using Microsoft-Specific Predefined Preprocessor Macros // Ref: http://msdn.microsoft.com/en-us/library/b0084kay(VS.80).aspx TCHAR buffer[MAX_PATH]; CS

Meanings of commonly used Macros in Visual C ++ MFCAnd_catchand_catch and_catch (exception_class, exception _ object_point_name) Description:Define Code Block, which is used to obtain the additional exception type in the current try block. Use the catch macro to obtain an exception type, and then use the and_catch macro to obtain the subsequent exception handling code. You can access the exception object (if appropriate) and have more messages about t

C/C ++ zhonghong summary CProgramOfSource codeVarious compilation commands can be included. These commands are called preprocessing commands. Although they are not actually part of the C language, they extend the C programming environment. This section describes how to use preprocessing programs and annotations to simplify the program development process and improve the readability of the program.Macros are not part of the C/C ++ language and are pre-processed by the processor before compilation

Document directory Copy attribute name to definition using macros in ER/studio Copy attribute name to definition using macros in ER/studio Recently, when processing the SQL script generated by ER/studio, we found that if the definition is not defined, there will be no table and field comments after the SQL script is generated.Therefore, a macro is written to implement this function. The Code is as follow

1. Macros① no macros #define MAX ② macros are precompiled when you replace them③ Plain capitalization definition macrosThe main function of the ④ macro is to replacethe use of ⑤ macros makes the program easier to modify2. Conditional compilation① function: Compile different code according to different conditions② typic

This article by larrylgq prepared, reproduced please note the Source: http://blog.csdn.net/larrylgq/article/details/7395261 Author: Lu guiqiang Email: larry.lv.word@gmail.com Lisp uses special operators to extend the syntax, but the number of special operators in lisp is fixed. To solve this problem, LISP introduces macros, which do not directly do things, but generate actual services.Code. Evaluate a macro: If the received S-expression