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In iOS development, macro definitions are often used, or some data types are modified with const, and often developers do not know how to use them correctly, resulting in the confusion of macros and const decorations in the project.Can you distinguish between the following? Do you know when to use it?#define Hscoder @ "Hansha haha"NSString *hscoder = @ "Hansha haha";extern NSString *hscoder;extern const NSString *hscoder;static const NSString *hscoder
ATL 7.0 introduces some of the new transformation classes and macros that provide important improvements to existing macros.The new string conversion class and name macro form: C Source type 2[c] target type [EX]which• The source type and target type are described in the following table.[c] is the target type must be read-only.[ex] is the initial size of the buffer that must be specified as a template parameter. Source Type/target type
Macros do not follow the rules for scopes and types in C + +. This often leads to some subtle or less subtle problems. As a result, C + + provides a more suitable alternative to C + +, when it refers to C + + except for compatible C parts, such as inline functions, templates, and namespaces. Consider: #include "someheader.h" struct S { int alpha; int beta; }; If someone (unwisely) writes a macro called "alpha" or "beta", it will not
Tags: io ar using SP for file on Div CTIOgg macros, like macros in C, provide function encapsulation, which means that some configuration parameters can be organized into a macro and then shared across multiple parameter files, particularly useful for environments with complex or multiple replication points. Below we will show you how to create a library of macros
You can easily set up double-sided print Word documents in the Word2003 Print dialog box, but there is no setup option for duplex printing in Excle2003. Users can implement double-sided printing Excel2003 tables by editing macro commands in Excel2003. 1. Edit Excel2003 Macros Command The first time you use the macro feature in Excel2003, you need to add a Personal macro workbook (that is, Pernosal.xls), and then use the Visual Basic Editor to edit t
preprocessing Directives The Swift compiler does not contain pre-processors. Instead, it takes advantage of compile-time properties to generate configuration and language features to accomplish the same functionality. Therefore, Swift does not introduce pre-processing instructions. Simple Macro In C and objective-c, you typically use a # define directive that defines a basic constant in swift, which you can use instead of global constants. For example: A global definition of # define Fade_a
Some object macros are defined in standard C and each compiler. These macros start and end with "_" and are all uppercase characters. these predefined macros can be # UNDEF or redefined. The _ file __,__ line __,__ data __,__ time __,__ stdc _ Standard predefined macros are defined in the ansi c standard. GCC extends i
Using macros to call DirectX com Many Microsoft DirectX interfaces define a macro for each method, which makes it easier to use these methods in your application. You will find these macros in the header file of the interface declaration. These macros are designed to be Macros in C and
Preface: If you are familiar with C language, you should be familiar with macros. macros are often used in C language programming. The main purpose of using macros is to facilitate programming for programmers, in addition, the program efficiency can be improved to a certain extent. The macro definition command in C language is # define. The following are some sma
Preface: If you are familiar with C language, you should be familiar with macros. macros are often used in C language programming. The main purpose of using macros is to facilitate programming for programmers, in addition, the program efficiency can be improved to a certain extent. The macro definition command in C language is # define. The following are some sm
This article tests three compilers, namely VC, mingw, and GCC, in 32-bit and 64-bit modes. In six cases, the predefined macro values related to 64-bit programming are used. It is of reference significance for cross-platform programming. Agner fog mentioned some reservation Macros in his calling conventions for different C ++ compilers and operating systems. The following is an excerpt. Note: The following content is from calling conventions for diffe
------ ManyProgramThe clerk does not know what the "macro" in C really means? In particular, macros and functions are often confused when they have parameters. Here I want to talk about "macros". macros are just a definition. They define a statement block. When the program is compiled, the compiler must first execute an action to replace the source program and
In the usual use of Word, you will always encounter the need to repeat the same content situation, when users can use the macro function to simplify a series of operations, thereby improving the efficiency of the instrument processing. A macro is a well-defined operation, a collection of instructions, or a piece of program code. A macro is actually a series of commands and functions stored in a Visual Basic module that can be run at any time when it needs to be performed. Creating autorun
Standard C-language preprocessing requires defining some object macros, with the name of each of the predefined macros beginning and ending with one or two underscore characters that cannot be undefined (#undef) or redefined by programmers. The following predefined macro table, I copied it down.__line__ the line number of the current program line, expressed as a decimal integer constant__file__ the current
Macro: Use a string to replace an expression code or function call code. Before compilation, the Preprocessor uses the expression code or function call Code represented by this macro string to replace all the macro strings that appear. In this case, the function call Code represented by a macro does not need to open up the function stack, and does not need to protect and restore the function call site. This improves the code execution efficiency, calling a macro is more effective than calling a
1.Inline functions and macros: Inline extension is used to eliminate the time overhead for function calls. It is usually used for frequently executed functions. A function with a small memory space is very beneficial. So what is the relationship between inline functions and Macros ?? In fact, the functions of inline functions are similar to those of preprocessing m
Generally, our understanding of C/C ++ macros is nothing more than two points: 1. It is used to process repeated inclusion of header files. 2. Macro used to define similar functions. Everyone can understand the first point. Second, we often see macros used to define similar functions. What is more classic: Define max (A, B) (A> B )? (A) :( B) A similar approach is primarily to bypass type checks, in this wa
Record macros in Word 2013 Step 1: Start Word 2013 and open the document, enter the text you want to work with in the document, and then, on the View tab, in the Macros group, click the Macro button and select the Record Macro option in the Open list, as shown in Figure 1. The Record Macro dialog box opens, you enter the name of the macro in the Macro Name text box, and you select the document that you save
You is a C programmer, you must is familiar with macros. They is powerful and can help you ease your work if used correctly. However, if you don ' t define macros carefully, they could bite you and drive you crazy. In the many C programs, you could see a special macro definition which may seem isn't so straightforward. Here is one example: #define __set_task_state (tsk, State_value) do {(tsk)->state = (stat
This article mainly introduces the use of macroable macros in Laravel, has a certain reference value, now share to everyone, the need for friends can refer to the definition of Baidu Encyclopedia: Macro in computer science is a kind of title for batch processing. Generally, a macro is a rule or pattern, or syntax substitution, that describes how a particular input (usually a string) is converted to the corresponding output (usually a string) b
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