#this指针

c++ this指针

先要理解class的意思。class应该理解为一种类型,象int,char一样,是用户自定义的类型。用这个类型可以来声明一个变量,比如intx,myclassmy等等。这样就像变量x具有int类型一样,变量my具有myclass类型。理解了这个,就好解释this了,my里的this就是指向my的指针。如果还有一个变量m...
代码星球 ·2020-10-13

C++ 面向对象 类成员函数this指针

每个类成员函数都只涉及一个对象,即调用它的对象。但有时候方法可能涉及到两个对象,在这种情况下需要使用C++的this指针 假设将方法命名为topval(),则函数调用stock1.topval()将访问stock1的对象数据;stock2.topval()将访问stock2的对象数据; 如果希望该方...

c++0.3----this指针/static/namespace

本篇文章为额外内容:包含this指针,static静态成员变量和函数,命名空间。以下为namespace.h文件的内容:(包含上述所有的知识哦)1#ifndef__NAMESPACE__2#define__NAMESPACE__3#include<iostream>4usingnamespacestd;56...

this指针

在C++中,每一个对象都能够通过this指针来访问自己的地址。this指针是所有成员函数的隐含参数。因此,在成员函数内部,它可以用来指向调用对象。友元函数是没有this指针的,因为友元不是类的成员,只有成员函数才有this指针。/***this.cpp***/#include<iostream>usingn...
代码星球 ·2020-04-09

this指针基础介绍

=================this指针的由来====================     一个学生可以有多本书一样,而这些书都是属于这个同学的;同理,如果有很多个同学在一起,那么为了确定他们的书不要拿混淆了,最好的办法我想应该就是每个同学都在自己的书上写上名...
开发笔记 ·2020-03-10

Mysql报错: ERROR 1290 (HY000): The MySQL server is running with the --secure-file-priv option so it cannot execute this statement

解决方法一:报错:ERROR1290(HY000):TheMySQLserverisrunningwiththe--secure-file-privoptionsoitcannotexecutethisstatement 二:分析:MySQL对于导入导出的目录是有限制的,只允许指定的目录才能导入导出。secu...

ORA-30357: this PL/SQL function cannot be supported for query rewrite

文档解释ORA-30357:thisPL/SQLfunctioncannotbesupportedforqueryrewriteCause:ThestatementreferencedaPL/SQLfunctionthatisnotmarkedDETERMINISTIC.Action:Performoneofthefo...
IT技术学习 ·2023-07-28

ORA-30364: this level has the same set of columns as another

文档解释ORA-30364:thislevelhasthesamesetofcolumnsasanotherCause:Theleveldefinitioncontainedthesamesetofcolumnsasanotherlevel.Action:Eliminatetheredundantleveldefini...
IT技术学习 ·2023-07-28

ORA-25033: triggers cannot be executed at this time

文档解释ORA-25033:triggerscannotbeexecutedatthistimeCause:Anattemptwasmadetoexecuteatriggerwhenthesessionwasalmostfinished.Action:DonotattempttoDMLwithtriggersthata...

ORA-47920: Authorization failed for user string to perform this operation

文档解释ORA-47920:AuthorizationfailedforuserstringtoperformthisoperationCause:TheoperationattemptedisnotallowedforthisuserAction:Pleaseensureyouhaveprivilegestoperf...

ORA-42311: This operation is not permitted on Editioning views with compilation errors

文档解释ORA-42311:ThisoperationisnotpermittedonEditioningviewswithcompilationerrorsCause:ALTERVIEWREADONLYandALTERVIEWREADWRITEarenotpermittedonEditioningviewswhich...

ORA-23408: this replication operation is not supported in a mixed configuration

文档解释ORA-23408:thisreplicationoperationisnotsupportedinamixedconfigurationCause:operationisnotsupportediftheobjectgroupisreplicatedatapre-V8node.Action:Ensuretha...

ORA-30742: cannot grant SELECT privilege WITH HIERARCHY OPTION on this object

文档解释ORA-30742:cannotgrantSELECTprivilegeWITHHIERARCHYOPTIONonthisobjectCause:TheusertriedtograntSELECTprivilegeWITHHIERARCHYOPTIONonanobjectthatisnotoneofthefol...

ORA-32404: snapshot log uses Change Data Capture which is not enabled for this database

文档解释ORA-32404:snapshotlogusesChangeDataCapturewhichisnotenabledforthisdatabaseCause:AsnapshotlogthatutilizesChangeDataCaptureisbeingimportedtoadatabasewhereChan...

ORA-32424: materialized view log on “string”.”string” already has this purge option

文档解释ORA-32424:materializedviewlogon“string”.”string”alreadyhasthispurgeoptionCause:Materializedviewlogontheindicatedtablealreadyhasthepu...
首页上一页12345...下一页尾页