Want to know macro eyebrows? we have a huge selection of macro eyebrows information on alibabacloud.com
Macro functions are fast to execute, but occupy a large length of Code and are not easy to debug. Maxcompute macro functions can be written #define f(a,b) ((a)+(b)) All the parameters in the macro function should be enclosed in parentheses to ensure that the operations of A and B are completed first. the outermost side of the
Macro alternative solution in C ++ Macro is a god in the C language and can play with various tricks. It is also because of this that it will cause a lot of troubles to ordinary programmers. Since macros only work in the pre-compilation phase, the compiler cannot detect the bugs. As a new C ++ programmer, it is better to stay away from them. C ++ provides some alternative solutions for macros. 1. Constant
Original article: http://xinbaojiang.blog.163.com/blog/static/119970729200952411266197/ Use afx_ext_class to export and import data The extension DLL uses the afx_ext_class macro export class. The executable file linked to the extension DLL uses this macro import class. Use the afx_ext_class macro to generate the same header file of the extended DLL and use i
module in the kernel is modified, it is inconvenient to compile the entire system after the modification, it means that the processor runs for a long time in the kernel, which is not suitable for applications with high speed requirements. In short, after the operating system kernel reaches a certain level, there will be a series of problems arising from the large kernel. To solve these problems, people have come up with a series of ways to make the kernel smaller while meeting the services requ
When porting the C header file, the Assembly always finds that the db dw dd DQ type is hard and unreadable, And the Win32 and win64 structures need to be maintained in two copies. So I wrote a FASM typedef macro (the same as C), which can be used in struct definition, data definition, and local variable definition of the function. ; --- ===--- FASM typedef macro by G-spider @ 2013; --- ===---
Author: Zhu Jincan Source: http://blog.csdn.net/clever101 When a friend used EXCEL to create a table, he asked me to write a calculation formula in one column and automatically calculate the calculation result in the other column, for example: I told him that this can be implemented by writing a macro. The procedure is as follows: 1. Find the macro (m) under the macr
C Language Program Run Order: Source code-"compilation preprocessing-" Compile-"link-" RunCompile pre-processing directives: parsing instructions before compilingCompiling pre-processing directives1, macro definition #define1.1 macro definition with no parameters1.2 Macro definition with parameters2. Conditional compilation3. The file contains #includeCompile pre
' main ': mic.c:10:error:expected expression before ') ' token Tip Missing right parenthesis. This is because, when the macro expands, "Hello world\n" is inserted into format, however, followed by a comma, but this comma is expected to have the args parameter, but here is not, so the macro cannot be expanded completely, and therefore cannot be compiled through. Then, change the
Advantages of inline functions:One: the inline function of the class defined by inline, the code of the function is put into the symbol table and replaced directly (as the macro definition expands), without the overhead of the call, the efficiency is high.Second: The introverted function of a class is a real function.Three: Use inline function inline to completely replace the macro definition of an expressi
We have a brief overview of the macros in the word2007 document, including the activation and enablement of macros. We also know that macros are operations commands, and if you want to work on a certain part of the document while editing it, then you can record the steps as a macro and you can do the same thing. (1) Click the Word2007 View tab, click the Macros button in the Macros area, and select the Record Mac
Kernel components use __SETUP macros to register keywords and associated processing functions, __setup macros are defined in Include/linux/init.h, and their prototypes are as follows:__setup (String, Function_handler)Where: string is the keyword, Function_handler is the association handler function. __setup just tells the kernel to execute Function_handler when the input string contains a string at startup. A string must end with an "=" character to make Parse_args easier to parse. Any text imme
Because of the work and learning needs, the author often read a lot of information on the Internet, but because of the online text format is different, so I like to save it, and use Word to open, carefully set its font and background to read. This way, every time you read it, you need to reset it, which is troublesome. Not long ago I saw the macro command in Word, and after careful study, I found that it could help me a lot. Just make the following se
A macro definition is one of the pre-compilation features, pre-compilation, also known as preprocessing, is the preparatory work for the compilation phase. The instructions that handle the beginning of the #, such as the file code that the copy #include contains, #define宏定义的替换, conditional compilation, and so on.Benefits of using macro definitions: Benefits of using Mac
In some cases, you may want to perform one or more operations in a macro only when the specified condition is true. For example, if a macro is used to verify data in a form, the corresponding information may be displayed to respond to certain input values of the record, and the other information to respond to different values. In this case, you can use conditions to control the
Macro definition occurs in the pre-compilation phase. Simply put, the essence is text replacement. Note the following when using it: 1. Complete brackets must be used when macro expressions are used. For example, the following three examples: # Define ADD (a, B) a + B # Define ADD (a, B) (a + B) # Define ADD (a, B) (a) + (B) All three definitions do not meet the requirements. The traps are as follows: When
In the C standard library language, printf, scanf, sscanf, sprintf, sscanf into the output function, the parameters are variable. When you debug a program. We may want to define a variable output function to record the log, so a variable-parameter macro is a good choice.In C99 , macros can also be defined as functions with variable parameters, such as:#define LOG (format, ...) fprintf (stdout, format, __va_args__)among them,... Represents a variable p
With Delphi macro can do some very simple work, it is recording the action of the keyboard, if we will have some regular action, with the macro to operate, you can achieve a multiplier effect, the premise is that the code style is relatively neat.The macro starts with CTRL + SHIFT + R, also ends with CTRL + SHIFT + R, and plays with CTRL + SHIFT + P.After you sta
Macro definition in many languages can see its shadow, C #, C++,c, and so on, especially the system API inside a lot of macro definition, looking very bluffing people. Reasonable use of macro definition, you can make your code look more standardized, more convenient, especially in certain places. Using a macro definiti
type as member, and initialized to PTR.(Type *) (char *) _ mptr-offsetof (type, member); it means the address of _ mptr minus the offset of member in this struct, then convert it to type pointer. this pointer is the entry address of member. Example 1; The container_of macro is defined in [INCLUDE/Linux/kernel. H: # Define container_of (PTR, type, member )/ Const typeof (type *) 0)-> member) * _ mptr = (PTR );/ (Type *) (char *) _ mptr-offsetof (type,
Here is a question about macros. I have used ATL's String Conversion macros, including w2a, which I don't quite understand at first. To use these macros, you must start with the function. Use uses_conversion to initialize some local variables. Use it, but let's look at the macro definition. It has the following code: // In the atlconv. h file # Define uses_conversion \ Int _ convert ;\ Uint _ ACP = getacp (); _ ACP ;\ Lpcwstr _ lpw ;\? Why do we use "
Start building with 50+ products and up to 12 months usage for Elastic Compute Service
1 on 1 presale consultation
24/7 Technical Support 6 Free Tickets per Quarter Faster Response
Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.
A comprehensive suite of global cloud computing services to power your business
Payment Methods We Support
