In C and C + + languages, an identifier is allowed to represent a string, called a macro, which can be a constant, an expression, a string of formatting, and so on. When compiling preprocessing, all occurrences of the "macro name" in the program are substituted with the string in the macro definition, which is called "macro substitution" or "macro expansion." A macro definition is done by a macro
About the declarations and definitions of C + + variablesAs we already know, a function generally consists of two parts: the declaration part and the execution statement.
The role of the Declarations section is to describe the properties of the relevant identifiers, such as the variables, functions, structs, and so on. For functions, the distinction between declarations and definitions is obvious, as explained above, the declaration of a function is a prototype of a function, and the
I. Overview:
1. After a site is created based on the site definition, the related site definition cannot be deleted. After the site set or website wear is complete, the related site definition files are available, deletion will cause the function to fail to run normally.
2. the XML file in 1033 \ XML is the site definitio
In the introduction to the spring IOC container launch, a rough analysis of the launch process of the IOC container was made on the basis of Classpathxmlapplicationcontext, with no detailed description of some of the more complex steps, This article begins with some of the more complex steps that are analyzed. This article analyzes the parsing and loading process of the bean definition of the IOC container based on the Classpathxmlapplicationcontext.
development of function declarations
1 implicit function Declaration implicit function declarationThe main function and the printf function return value type int, if not declared, the compiler default function return value is the INT type C90 standard, this kind of writing enters the process which is gradually discarded (although it was not abolished completely immediately) C99 abolished the implicit function declaration law (remove impli CIT function declaration), omitting the int in front of
Replace macros with inline:
1. Inline functions can be debugged at run time, while macro definitions are not possible;2. The compiler will do security checks or automatic type conversions (with normal functions) on the parameter types of the function, while the macro definition will not;3. The inline function can access the member variables of the class, and the macro definition cannot;4. Declare a member
We know that in the Linux kernel, different CPUs have different byte-order definitions for different CPUs.This section of the year is mainly about: different CPUs, the definition of the individual bits is also different.The Linux kernel version used for this analysis is: linux--3.0.0-12.Arch/xxx/include/asm/bitsperlong.h: Bit length definition for different CPUs (XXX)1) ARM (xxx=arm):#include (2) PowerPC (X
Whim:In a language to write C + + plug-in, can replace the macro definition,You can do this by adding specific tags to C + +, such as The middle code can be translated into C + + code and compiled with the C + + compiler.Bothered:1.c++ macro must be anti-slash, and then need a lot of repetitive logic code, the need for macros to reduce the amount of code, to achieve efficient work;2. If there is a large number of macro code in C + +, it is a bit hard
))Pt_thread See protothread mechanismStatic Char process_thread_hello_world_process (struct pt *process_pt, process_event_t ev, PROCESS_ data_t data);This statement is equivalent to declaring a function Process_thread_hello_world, and this function is the Process execution entity function . It can be seen in the subsequent definition process structure.Process structure Body:structProcess {structProcess *next;//point to the next process structure and u
ObjectiveRecently help the company to optimize the database, with the previous learning, step-by-step learning knowledge for practice, finally is the speed rub up, a query originally to execute more than 1 minutes now only need 3 seconds.Now the study of what they think and use to summarize, on the one hand to consolidate knowledge, on the other hand to the vast number of students to reference.This set of tutorials is a total of 13 speaking.In this series of tutorials, you will learn1. How to op
Transfer from 798973271, the most common definition method: Define the structure of data, at this time the structure is equivalent to a type, such as int, if you want to use this struct, method with intstruct Data{char AA;char BB;Char cc;int DD;};struct data sum1, sum2;2, define the structure of the data at the same time, define the need to use the structural body variable sum1,sum2. If you need to define a struct variable later, the method is the sam
Introduction: The difference between a member function definition within a class and outside a class is whether the expansion is inline.Definitions are generally inline-expanded within a class, saving the overhead of calling functions. If the function body is too large, the compiler ignores the inline recommendationsIf the definition is outside the class and needs to be declared within the class, the progra
Win7 system frequently pops up Realtek High Definition Audio manager how to handle?
Workaround:
1. Click the "Folder" button in the upper-right corner of the audio manager in Realtek High definition.
2, then check the "Disable the front board Jack Detection" option, and then determine;
3, test whether will pop up, if it will, then "when inserting the device, open the Automatic pop-up dialog b
Encountered problems, first of all, JS object encapsulation, JS does not provide a class mechanism, the only built-in class is a function class, that is, all functions are the object of the function class instantiation. But depending on this unique class, we can simulate the definition of a new class.
The first thought is to define the complete class directly with function generation:
Copy Code code as follows:
function MyClass (Arg,..
Definition of a functionPython uses the keyword def definition function, which is similar in format to C, but does not have a return type, and the parameter does not require a set type.def add(a, b): """这是函数的文档字符串""" return a + bdef append(data): data.append(a) #如果data为可变对象时候,例如List、Dict,则会改变实参的值
A function call generates a new symbol table for the function local variable. To be exact,
Why is the Python function definition default parameter must point to the immutable object?The following is a personal understanding, if there is a wrong place, welcome to discussCause analysis: When defined, the function allocates the memory space of the object to which the function and default parameter L point.1. If L is pointing to a mutable object, and the variable object is updated in the function, the variable object is created when the functio
1. Why use a function?(1) Too many code repetitions (2) Poor readabilityBenefits of using Functions:(1) Code reuse(2) Maintain consistency, easy maintenance(2) Scalability2. Initial function definition and invocation definition of a function def Test (x): " The function Definitions " x+=1 return x def : Defines a keyword for a function "" : Document description (not necessary, but
JavaScript learning records definition and invocation of day5-functions[TOC]1. Defining functionsIn JavaScript, you define a function as follows:function abs(x) { if (x >= 0) { return x; } else { return -x; }}abs()the above functions are defined as follows:functionIndicates that this is a function definition;absis the name of the function;(x)The parameters of the function are listed i
Cmdpull.Job *engine. The JOB is the input parameter of the method, and the type is engine. JobEngine. Status is the return parameter of the method, and the type is engine. StatusThe above is designed to 3 types, but Tagstore is used directly, while job and status are obtained by means of the engine.Because the Tagstore is in the same package as the current method, it is the package graphAnd the job and status are under the package engine (DOCKER/ENGINE/JOB.GO), so with the packet name, and the
DomainAlso called the member variable, embodies the state of the class, and the change of State is realized by the method of the class body. Definition of a domain: Defines a static property of a class. fields must be defined directly in the class body and cannot be included in the method definition. The format of the field definition is as follows: [modifier] ty
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