swift macros

MacroOur calculator program, with 1234 corresponding to subtraction, is a bit of a hindrance to people reading. After one months to look at this code may not be able to think of 0123 or 1234, but also to find in the code, if you can represent the four number of arithmetic to take a meaningful alias, a look is to know what corresponds. No problem, use a macro. The following is the fifth edition of our Calculator program://define arithmetic macros#defin

program in or out of the compilation commands, such as # if and #ifdef, and usually converts the excluded statement to a blank line.(3) Macro 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 pur

1. Hybrid macros. As styles become more and more complex and require repeated use of large sections of styles, using variables cannot achieve our goal. At this time, the mixed macros will be used. When using a hybrid macro, you must first declare a hybrid macro. When declaring a hybrid macro, there are two types: A Mixed Macro without parameters and a Mixed Macro with parameters. 1.1Declaration of mixed

ZZ from:http://blog.csdn.net/musein/article/details/742609==================================================The __init and __exit declarations is special kernel macros designed to tell the kernel to flag thesefunctions for special handling in cases where they is compiled in statically rather than included asparts of modules.The __init declaration allows the kernel to reclaim the space used by initializationfunctions, while the __exit declaration tells

Compilation: assemblyGuess: So this macro is related to the assembly?!Reference: Some of the constant macros are referenced by both C and ASM, while C and ASM differ in the processing of the immediate number symbol . In ASM, directives are adopted to differentiate whether the operands are signed or unsigned, rather than through the operands. and C is through the property of the variable, not through the operator. c If you want to indicate that a cons

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

, Person.type represents the meta type that gets the person. Self if invoked by the class name, then you can get the type of the class, which is to get yourself 4. How to crawl the exception in the Swife. Grabbing an exception in Swift requires do,catch,try these three keywords here's an example of JSON serialization do{let path =/.. Path.. /Let data =/... Turn data. ///The compiler will ask you to implement ano

Directory:First, Welcome to SwiftSecond, Language GuideThird, Language Reference/*Translator's nonsense:A few hours ago stayed up watching WWDC, all kinds of excitement, this year is very material Ah! When we see swift coming out, I suddenly get dumbfounded and learn a new language. This article is from Apple's official "The Swift Programming Language" book, about 500 pages, downloaded on the Apple website.

should understand, because in the objective-c = = comparison is a reference, because arr1 and arr2 are two different objects, so even if their values are the same, but their references are not the same. So = = comparison will fail. The second comparison is Nsarray's Isequaltoarray method, which is used to compare values because the values of the two arrays are the same, so the isequaltoarray comparison method returns 1.equatable ProtocolWe learned about the workings of the equality operation th

The Swift Programming Language-class and struct, swift struct Classes and struct in Swift have many things in common. The common cause is: • Define attributes for storing values • Define methods to provide functions • Defining subscript is used to access values through subscript syntax • Defines the initialization tool used to generate the initialization value •

1. Description of this seriesThis series is just a quick start tutorial for swift and does not have an exhaustive introduction to Swift,swift nor is it a simple programming language, so for a detailed system of learning Swift, this series is not for you, this series is just for developers to quickly develop with

Interoperability is a feature that enables swift and objective-c to be interfaced, enabling you to access and use code written in another language in a file written in one language. When you are ready to start incorporating swift into your development process, you should know how to use interoperability toInitialize (initialization) in order to instantiate the Objective-c class with

What we should talk about here is not to use macros to prevent header files from being retained. Define a macro in the final structure. In the past, they often used this kind of macro in the company's documents, which is more clever than others. For example, an interface structure: // Define interface typedef struct character {vos_u32 u32ifnetindex; vos_u32 u32phyindex; // vos_u32 character; stip_config stipcfg; Disable enstatus; vos_u8 character

Lower limit Use a huge set of rights titles of Visual Studio production programs C # VB Four major collections Generateheader is the title of the license edition of the current file production program Generateallheader indicates the copyright header of all file production programs in the solution. Clearallheader clear existing file program license Header Clearheader clears all file programs in the internal version permission Header Usage Open macr