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
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
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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
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
When you compile a shader program, Unity defines several preprocessing macros.Target platform
SHADER_API_OPENGL-Desktop OpenGL
SHADER_API_D3D9-Direct3D 9
SHADER_API_XBOX360-Xbox 360
SHADER_API_PS3-PlayStation 3
SHADER_API_D3D11-Desktop Direct3D 11
SHADER_API_GLES-OpenGL ES 2.0 (desktop or mobile), using the presence of shader_api_mobile to determine.
SHADER_API_FLASH-Flash Stage3D
SHADER_API_D3D11_9X-Direct3D 11 target for Windows RT
In addition, the tar
Word documents need to add a canonical signature, such as name, address, ZIP code, telephone, e-mail, QQ, etc., if each article to add this information, will certainly affect productivity, now we can use the Wrod "macros" to quickly add signature information.Tip: A shortcut key or a mouse click, detailed information on the inscription can appear in the document, this efficiency than slowly an entry, or even copy and paste are much higher, all this tak
which function would handle a user-defined message when you have aCWinThreadClass.ON_UPDATE_COMMAND_UIIndicates which function would handle a specified user-interface update command message.message-map Range MacrosOn_command_rangeIndicates which function would handle the range of command IDs specified in the first and parameters to the macro.On_update_command_ui_rangeIndicates which update handler would handle the range of command IDs specified in the first and parameters to the macro.On_contro
VBA and Macros======The beginning of the content sounds very dull, please do not distract, resistance to look down, interest is always slowly accumulated.------------------------------------------------------------------------------1, hand in hand, record a part of their own macroReferring to VBA, I believe many people think of the macro, but VBA and macro is not the same thing? I think they're not the same thing, but it doesn't matter what we're goin
Pre-defined Macros in visual c ++I. Main Objectives
(Because visual studio usually contains many development environments, c/c ++ ide is usually called visual c ++ 20xx)
Sort out the predefined Macros in visual c ++ 2010. Let's take a look at the preparation and understanding. In actual coding, we can consider using some macros as the judgment standard.
Http://ms
In the vs project configuration, you can see that vs provides you with some macros (macros), for example, but you cannot find the place to modify or add macros. After Google search, I found that the built-in macros of vs cannot be modified. Now there is still one problem. Can I add a new macro?
In the WebKit project, y
Macros for WindowsWhen using some new versions of Apis or new control features (such as the new version of comctl32.dll), you may get the error "error c2065: Undeclared identifier. The reason is that these functions depend on your operating system version. The definition in your header file is not up-to-date. (For MFC, It is stdafx. h) The following msdn article describes how to solve this problem and details the
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
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
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