几个典型运算符重载(C++)(四)ppt课件VIP

2020/4/27,.,1,7.3几个典型运算符重载,2020/4/27,.,2,7.3几个典型运算符重载,数学类中常用的几个运算重载的特点和应用,6.3几个典型运算符重载,2020/4/27,.,3,7.3.1重载+与-,设AAobject；运算符+和-有两种方式：前置方式：+Aobject-Aobject,后置方式：Aobject+Aobject-,成员函数重载A:Aoperator+();解释为：Aobject.operator+();友员函数重载friendAoperator+(A,成员函数重载A:Aoperator+(int);解释为：Aobject.operator+(0);友员函数重载：friendAoperator+(A解释为：operator+(Aobject,0),伪参数,6.3.1重载+与-,2020/4/27,.,4,成员函数重载+,#includeclassIncreasepublic:Increase()value=0;voiddisplay()constcoutvaluen;Increaseoperator+();/前置Increaseoperator+(int);/后置private:unsignedvalue;IncreaseIncrease:operator+()value+;return*this;IncreaseIncrease:operator+(int)Increasetemp;temp.value=value+;returntemp;voidmain()Increasea,b,n;for(inti=0;i10;i+)a=n+;coutn=;n.display();couta=;a.display();for(i=0;i10;i+)b=+n;coutn=;n.display();coutb=;b.display();,6.3.1重载+与-,2020/4/27,.,5,成员函数重载+,#includeclassIncreasepublic:Increase()value=0;voiddisplay()constcoutvaluen;Increaseoperator+();/前置Increaseoperator+(int);/后置private:unsignedvalue;IncreaseIncrease:operator+()value+;return*this;IncreaseIncrease:operator+(int)Increasetemp;temp.value=value+;returntemp;voidmain()Increasea,b,n;for(inti=0;i10;i+)a=n+;coutn=;n.display();couta=;a.display();for(i=0;i10;i+)b=+n;coutn=;n.display();coutb=;b.display();,Increaseoperator+();,IncreaseIncrease:operator+()value+;return*this;,+n;,预定义版本,6.3.1重载+与-,2020/4/27,.,6,成员函数重载+,#includeclassIncreasepublic:Increase()value=0;voiddisplay()constcoutvaluen;Increaseoperator+();/前置Increaseoperator+(int);/后置private:unsignedvalue;IncreaseIncrease:operator+()value+;return*this;IncreaseIncrease:operator+(int)Increasetemp;temp.value=value+;returntemp;voidmain()Increasea,b,n;for(inti=0;i10;i+)a=n+;coutn=;n.display();couta=;a.display();for(i=0;i10;i+)b=+n;coutn=;n.display();coutb=;b.display();,Increaseoperator+();,IncreaseIncrease:operator+()value+;return*this;,+n;,重载版本,6.3.1重载+与-,2020/4/27,.,7,成员函数重载+,#includeclassIncreasepublic:Increase()value=0;voiddisplay()constcoutvaluen;Increaseoperator+();/前置Increaseoperator+(int);/后置private:unsignedvalue;IncreaseIncrease:operator+()value+;return*this;IncreaseIncrease:operator+(int)Increasetemp;temp.value=value+;returntemp;voidmain()Increasea,b,n;for(inti=0;i10;i+)a=n+;coutn=;n.display();couta=;a.display();for(i=0;i10;i+)b=+n;coutn=;n.display();coutb=;b.display();,Increaseoperator+(int);,IncreaseIncrease:operator+(int)Increasetemp;temp.value=value+;returntemp;,n+;,预定义版本,6.3.1重载+与-,2020/4/27,.,8,成员函数重载+,#includeclassIncreasepublic:Increase()value=0;voiddisplay()constcoutvaluen;Increaseoperator+();/前置Increaseoperator+(int);/后置private:unsignedvalue;IncreaseIncrease:operator+()value+;return*this;IncreaseIncrease:operator+(int)Increasetemp;temp.value=value+;returntemp;voidmain()Increasea,b,n;for(inti=0;i10;i+)a=n+;coutn=;n.display();couta=;a.display();for(i=0;i10;i+)b=+n;coutn=;n.display();coutb=;b.display();,Increaseoperator+(int);,IncreaseIncrease:operator+(int)Increasetemp;temp.value=value+;returntemp;,n+;,重载版本,6.3.1重载+与-,2020/4/27,.,9,成员函数重载+,#includeclassIncreasepublic:Increase()value=0;voiddisplay()constcoutvaluen;Increaseoperator+();/前置Increaseoperator+(int);/后置private:unsignedvalue;IncreaseIncrease:operator+()value+;return*this;IncreaseIncrease:operator+(int)Increasetemp;temp.value=value+;returntemp;voidmain()Increasea,b,n;for(inti=0;i10;i+)a=n+;coutn=;n.display();couta=;a.display();for(i=0;i10;i+)b=+n;coutn=;n.display();coutb=;b.display();,6.3.1重载+与-,2020/4/27,.,10,友员函数重载+,#includeclassIncreasepublic:Increase()value=0;voiddisplay()constcoutvaluen;friendIncreaseoperator+(Increase,6.3.1重载+与-,2020/4/27,.,11,友员函数重载+,#includeclassIncreasepublic:Increase()value=0;voiddisplay()constcoutvaluen;friendIncreaseoperator+(Increase,friendIncreaseoperator+(Increase,Increaseoperator+(Increase,+n;,通过引用参数操作对象,6.3.1重载+与-,2020/4/27,.,12,友员函数重载+,#includeclassIncreasepublic:Increase()value=0;voiddisplay()constcoutvaluen;friendIncreaseoperator+(Increase,friendIncreaseoperator+(Increase,Increaseoperator+(Increase,n+;,复制构造局部对象,6.3.1重载+与-,2020/4/27,.,13,友员函数重载+,#includeclassIncreasepublic:Increase()value=0;voiddisplay()constcoutvaluen;friendIncreaseoperator+(Increase,friendIncreaseoperator+(Increase,Increaseoperator+(Increase,n+;,伪参数,6.3.1重载+与-,2020/4/27,.,14,友员函数重载+,#includeclassIncreasepublic:Increase()value=0;voiddisplay()constcoutvaluen;friendIncreaseoperator+(Increase,6.3.1重载+与-,2020/4/27,.,15,7.3.2重载赋值运算符,赋值运算符重载用于对象数据的复制operator=必须重载为成员函数重载函数原型为：类型,6.3.2重载赋值运算符,2020/4/27,.,16,#include#includeclassNamepublic:Name(char*pN);Name(constName/调用重载赋值算符函数,定义Name类的重载赋值函数,6.3.2重载赋值运算符,2020/4/27,.,17,#include#includeclassNamepublic:Name(char*pN);Name(constName/调用重载赋值算符函数,定义Name类的重载赋值函数,初始化对象时调用复制构造函数,6.3.2重载赋值运算符,2020/4/27,.,18,#include#includeclassNamepublic:Name(char*pN);Name(constName/调用重载赋值算符函数,定义Name类的重载赋值函数,修改对象时调用重载赋值运算符函数,6.3.2重载赋值运算符,2020/4/27,.,19,定义Name类的重载赋值函数,Name:Name(char*pN)coutConstructingpNendl;pName=newcharstrlen(pN)+1;if(pName!=0)strcpy(pName,pN);size=strlen(pN);Name:Name(constName,Name,6.3.2重载赋值运算符,2020/4/27,.,20,Name:Name(char*pN)coutConstructingpNendl;pName=newcharstrlen(pN)+1;if(pName!=0)strcpy(pName,pN);size=strlen(pN);Name:Name(constName,定义Name类的重载赋值函数,Name,6.3.2重载赋值运算符,2020/4/27,.,21,Name:Name(char*pN)coutConstructingpNendl;pName=newcharstrlen(pN)+1;if(pName!=0)strcpy(pName,pN);size=strlen(pN);Name:Name(constName,定义Name类的重载赋值函数,Name,6.3.2重载赋值运算符,2020/4/27,.,22,Name:Name(char*pN)coutConstructingpNendl;pName=newcharstrlen(pN)+1;if(pName!=0)strcpy(pName,pN);size=strlen(pN);Name:Name(constName,定义Name类的重载赋值函数,Name,LiHai,6.3.2重载赋值运算符,2020/4/27,.,23,Name:Name(char*pN)coutConstructingpNendl;pName=newcharstrlen(pN)+1;if(pName!=0)strcpy(pName,pN);size=strlen(pN);Name:Name(constName,定义Name类的重载赋值函数,Name,LiHai,6,6.3.2重载赋值运算符,2020/4/27,.,24,Name:Name(char*pN)coutConstructingpNendl;pName=newcharstrlen(pN)+1;if(pName!=0)strcpy(pName,pN);size=strlen(pN);Name:Name(constName,定义Name类的重载赋值函数,Name,LiHai,6.3.2重载赋值运算符,2020/4/27,.,25,#include#includeclassNamepublic:Name(char*pN);Name(constName/调用重载赋值算符函数,定义Name类的重载赋值函数,6.3.2重载赋值运算符,2020/4/27,.,26,#include#includeclassNamepublic:Name(char*pN);Name(constName/调用重载赋值算符函数,定义Name类的重载赋值函数,6.3.2重载赋值运算符,2020/4/27,.,27,#include#includeclassNamepublic:Name(char*pN);Name(constName/调用重载赋值算符函数,定义Name类的重载赋值函数,6.3.2重载赋值运算符,2020/4/27,.,28,#include#includeclassNamepublic:Name(char*pN);Name(constName/调用重载赋值算符函数,定义Name类的重载赋值函数,6.3.2重载赋值运算符,2020/4/27,.,29,#include#includeclassNamepublic:Name(char*pN);Name(constName/调用重载赋值算符函数,定义Name类的重载赋值函数,6.3.2重载赋值运算符,2020/4/27,.,30,7.3.3重载运算符和(),运算符和()是二元运算符和()只能用成员函数重载，不能用友元函数重载,6.3.3重载运算符和(),2020/4/27,.,31,1重载下标算符,重载格式类:类型operator(类型)；,运算符用于访问数据对象的元素,6.3.3重载运算符和(),2020/4/27,.,32,1重载下标算符,重载格式类:类型operator(类型)；,运算符用于访问数据对象的元素,定义重载函数的类名,6.3.3重载运算符和(),2020/4/27,.,33,1重载下标算符,重载格式类:类型operator类型；,运算符用于访问数据对象的元素,函数返回类型,6.3.3重载运算符和(),2020/4/27,.,34,1重载下标算符,重载格式类:类型operator(类型)；,运算符用于访问数据对象的元素,函数名,6.3.3重载运算符和(),2020/4/27,.,35,1重载下标算符,重载格式类:类型operator(类型)；,运算符用于访问数据对象的元素,右操作数为符合原语义，用int,6.3.3重载运算符和(),2020/4/27,.,36,1重载下标算符,重载格式类:类型operator()类型；,运算符用于访问数据对象的元素,例设x是类X的一个对象，则表达式xy可被解释为x.operator(y),显式声明一个参数,6.3.3重载运算符和(),2020/4/27,.,37,2重载函数调用符(),/用重载()算符实现数学函数的抽象#includeclassFpublic:doubleoperator()(doublex,doubley);doubleF:operator()(doublex,doubley)returnx*x+y*y;voidmain()Ff;coutf(5.2,2.5)endl;,6.3.3重载运算符和(),2020/4/27,.,38,2重载函数调用符(),/用重载()算符实现数学函数的抽象#includeclassFpublic:doubleoperator()(doublex,doubley);doubleF:operator()(doublex,doubley)returnx*x+y*y;voidmain()Ff;coutf(5.2,2.5)endl;,f.operator()(5.2,2.5),6.3.3重载运算符和(),2020/4/27,.,39,2重载函数调用符(),/用重载()算符实现数学函数的抽象#includeclassFpublic:doubleoperator()(doublex,doubley);doubleF:operator()(doublex,doubley)returnx*x+y*y;voidmain()Ff;coutf(5.2,2.5)，用于输出和输入用户自定义的数据类型,7.3.4重载流插入和流提取运算符,6.3.4重载流插入和流提取运算符,2020/4/27,.,41,#include#includeclassvectorpublic:vector(intsize=1);vector();int,为vector类重载流插入运算符和提取运算符,6.3.4重载流插入和流提取运算符,2020/4/27,.,42,#include#includeclassvectorpublic:vector(intsize=1);vector();int,为vector类重载流插入运算符和提取运算符,重载几个运算符,6.3.4重载流插入和流提取运算符,2020/4/27,.,43,#include#includeclassvectorpublic:vector(intsize=1);vector();int,为vector类重载流插入运算符和提取运算符,标准流类,6.3.4重载流插入和流提取运算符,2020/4/27,.,44,#include#includeclassvectorpublic:vector(intsize=1);vector();int,为vector类重载流插入运算符和提取运算符,使用预定义版本,6.3.4重载流插入和流提取运算符,2020/4/27,.,45,#include#includeclassvectorpublic:vector(intsize=1);vector();int,为vector类重载流插入运算符和提取运算符,使用重载版本cin.operator(A),6.3.4重载流插入和流提取运算符,2020/4/27,.,46,#include#includeclassvectorpublic:vector(intsize=1);vector();int,为vector类重载流插入运算符和提取运算符,使用重载版本cout.operator(A),6.3.4重载流插入和流提取运算符,2020/4/27,.,47,vector:vector(intsize)if(size100)cout=0,为vector类重载流插入运算符和提取运算符,