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C + +: multiple. cpp files include the same. h header File Definition method

This article resolves the error of multiple definition of ' XX '. " for the purposes of anti-reptiles, you are not seen on the http://blog.csdn.net/zhanh1218 , certainly not the latest and most complete." "For the definition of the header file, be sure to add the following code (this is the header file protector):Person_h_ is the name of the protector, the general recommendation is consistent with the class

The definition and implementation of the "reprint" Learning C + + class (Classes)

I. Introduction to "Class"In C + +, use theclass"To describe"Object"The so-called" object "refers to all things in the real world. Then the class can be regarded as the abstraction of similar things, to find the similarities between these different things, such as bicycles and motorcycles, first of all they belong to the "object", and have the same point, and some different points, the same point as they have quality, there are two of wheels, all belong to transport and so on. "All have quality"

parameter definition of functions in Python and examples of variable parameter usages

The examples in this article describe the parameter definitions and variable parameter usages of functions in Python. Share to everyone for your reference. Specifically as follows: When learning to use Python, especially when looking at some library source code, often see Func (*args, **kwargs) Such a function definition, this * and * * is a bit confusing. In fact, as long as the definition of fu

Definition of pointer type

The syntax of a type definition boils down to a sentence: As long as you add a typedef to the variable definition, it becomes a type definition. What is supposed to be a variable here is a type. int integer; Integral type variableint *pointer; Integer pointer variableint array [5]; Integral type array variableint *p_array [5]; Variable of an array of integer poin

Class Definition details in C ++

Class Definition details in C ++ Member variables Each class can have no members or multiple members. The members can be data, functions, or type aliases. A class can contain several public, private, and protected parts. Members defined in the public part can be accessed by all code using this type; Members defined in the private part can be accessed by other class members. Protected can be accessed by the quilt class. Constructor A function that has

C language Declaration and definition of the detailed __c language

variable declarations and variable definitions Variable definitions: Used to allocate storage space for a variable, and to specify an initial value for a variable. In a program, a variable has and has only one definition. Variable declaration: Used to indicate the type and name of a variable to a program. A definition is also a declaration, an extern declaration is not a

[PHP] Conditional compilation definition in PHP source code, php source code

[PHP] Conditional compilation definition in PHP source code, php source code The mechanism for Compiling different codes and generating different target files according to different situations is called Conditional compilation.The following pre-processing commands are available: # if, # elif, # else # endif; # ifdef # else # endif PHP source code: # Ifdef SERIALIZE_HEADERS // if there is a macro definition

The collection of the article is very good, unfortunately, some still do not understand the amount ... Requirejs Advanced: Definition and loading of modules

textRequirejs Advanced: Definition and loading of modules Javascript Requirejs Two instruments released December 01, 2014 Recommended 4 Recommendations Collection 15 Favorites,6.9k browsing OverviewThe module differs from the traditional script file, and it defines a scope well to avoid global namespace contamination. It can explicitly list its dependencies and inject those dependencies in the form of a function (th

Python array definition method

This article mainly introduces the Python array definition method, and analyzes the Python one-dimensional array and two-dimensional array definition methods and related precautions in the form of examples, for more information about how to define Python arrays, see the following example. We will share this with you for your reference. The details are as follows: Python does not have an array data structu

C + + function duplicate definition, header file duplicate inclusion, mutual inclusion problem

1, avoid the header file repeat containsTEST.H This macro means that if a macro variable is defined Test_h_ it is no longer defined #ifndef test_h_#define test_h_//header file Contents #endifOrTest.h tells the precompiled compiler to include only one #pragma once2. Avoid duplicate definitionsDo not put the function definition in the header file, the correct way is to put the header file function declaration, the source file placement function

Creates a block definition and adds an entity to the specified location

This is accomplished by creating a new block definition in the current drawing and adding an entity to the block definition, inserting the entity into the current sheet, as in the following example:CString blockname = _t ("ADF");//this defines the name of the block to be createdAcdbblocktable *Pblktab; Acdbhostapplicationservices ()-workingdatabase ()-getblocktable (Pblktab, zcdb::kforwrite); if(Pblktab->ha

The difference between parameter (parameter) and define (macro definition) in Verilog

The difference between parameter (parameter) and define (macro definition) in Verilog Statement format Parameter xx=yy; (with semicolons)' Define XX yy (no semicolon) Function range The parameter is local and works only within the module that it defines, and the macro definition works on multiple files that are compiled at the same time. Even if a macro

Web Services Application Development Study Notes (2): XML Document Type Definition

Content: 1. What isXMLDocument definition type 2. DTD Declaration 3.InternalDTD 4.ExternalDTD 5.DTDSyntax 1. What isXMLDocument definition type The purpose of using XML is to exchange and share data. How can other users understand the structure of the XML document we created (including elements and attributes ), at this time, we need to develop a general method to describe the synta

Definition of function

There are three ways to define a function: keyword function to define : function declaration statement Functions f () {} function definition expression: Common form: var f = function () {}; There are no fewer semicolons here. Use constructor function: var f = new function (), pass in the parameter, the last parameter defaults to the function body, the preceding argument is the function parameter. (This method

DDL (Data Definition definitions ages) and ddldefinition

DDL (Data Definition definitions ages) and ddldefinition I haven't written any SQL statement for a long time. Let's review it. DDL defines different data segments, databases, tables, columns, indexes, and other database objects. Common DDL statements include create, drop, and alter. Logon data: mysql-uroot-p SQL commands generally end with a semicolon or \ g. Note that \ is not /. 1. Check the database show databases. Pay attention to the s following

Analysis of macro definition in C Language

1. How do I distinguish "macro name" from "macro string" in macro definition "? What should I pay attention to for macros with parameters? In macro definition, "macro name" and "macro string" are distinguished by "space. During macro definition processing, the compiler first reads the string from the first space after "# define" until the next space is met. The s

Jbpm process definition Version Policy

Basically, jbpm version control follows the following principles: 1) each time a process is released, a new process definition will be generated in the database. 2) a version number will be assigned to the process definition at the time of release. If the process name is the same, jbpm considers it to be the same process definition. Add 1 to the current maximu

Knowledge of the. NET development environment, console program creation, output, input, definition variables, variable assignments, value overrides, value stitching, value printing two data types, shaping type conversion

show you that there are two types of input statements1.console.writeline ("Here you can write what you want to show in the Window");2, Console.Write ("Here you can write what you want to show in the Window");The difference between the two is whether to wrap the line automaticallySo what's the input, and we'll look at the input statement.Console.ReadLine (); When you run the cursor will wait for user input, and then press ENTER to jump to the next line. Let's take a look at the running resultsFo

Spring-bean Definition Inheritance

A bean definition can contain a lot of configuration information, including constructor arguments, property values, and Co Ntainer-specific information such as initialization method, static factory method name, and so on.A child bean definition inherits the configuration data from a parent definition. The child definition

The definition and way of classes in JavaScript (JavaScript Advanced Program Learning notes) _js Object oriented

The inheritance of classes in JavaScript can refer to Nanyi's blog, "The design idea of JavaScript inheritance mechanism", which is very well said. First, the problems encountered in JavaScript instantiation: Here's a description of the example in the JavaScript Advanced program, which is an instance of the object class if you now define a car. Like the following: Copy Code code as follows: var ocar=new Object (); Ocar.color = "Red"; Ocar.doors = 4; Ocar.mpg = 23; Ocar.s

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