我有以下代码Vehicle.h
:
#pragma once
class Vehicle
{
public:
Vehicle();
~Vehicle();
private:
int wheels;
};
Car.h
#pragma once
#include "Vehicle.h"
class Car: public Vehicle
{
public:
Car();
~Car();
private:
int wheels=4;
};
ParkingLot.h
#pragma once
#include <vector>
#include <string>
#include "ParkingSpace.h"
#include "HandicappedParkingSpace.h"
#include "CompactParkingSpace.h"
#include "RegularParkingSpace.h"
class ParkingLot
{
public:
ParkingLot();
~ParkingLot();
void ParkVehicle(Vehicle _v, ParkingSpace& _ps, std::string ps);
void ReleaseVehicle(Vehicle _v, ParkingSpace& _ps, std::string ps);
void getOccupiedSpaces();
private:
int value;
std::vector <HandicappedParkingSpace> occupied_handicapparkingspaces;
std::vector <HandicappedParkingSpace> vacant_handicapparkingspaces;
std::vector <RegularParkingSpace> occupied_regularparkingspaces;
std::vector <RegularParkingSpace> vacant_regularparkingspaces;
std::vector <CompactParkingSpace> occupied_compactparkingspaces;
std::vector <CompactParkingSpace> vacant_compactparkingspaces;
};
ParkingLot.cpp
:#pragma once
#include <iostream>
#include <string>
#include <vector>
#include "ParkingLot.h"
using namespace std
ParkingLot::ParkingLot() {
for (int i=0; i<5; i++) {
HandicappedParkingSpace HPS(1, Null);
vacant_handicapparkingspaces.push_back(HPS);
}
for (int i=0; i<5; i++) {
CompactParkingSpace CPS(1, Null);
vacant_compactparkingspaces.push_back(CPS);
}
for (int i=0; i<5; i++) {
RegularParkingSpace RPS(1, Null);
vacant_regularparkingspaces.push_back(RPS);
}
cout<<"finished parking lot"<<endl;
}
void ParkingLot::ParkVehicle(Vehicle _v, ParkingSpace& _ps, std::string ps)
{
if (ps=="Handicapped") {
if (vacant_handicapparkingspaces.size()!=0) {
_ps.parkvehicle(_v);
vacant_handicapparkingspaces.pop_back();
occupied_handicapparkingspaces.push_back(_ps);
}
else
{
cout<<"No handicapped spaces available"<<endl;
}
}
else if (ps=="Compact") {
if (vacant_compactparkingspaces.size()!=0) {
_ps.parkvehicle(_v);
vacant_compactparkingspaces.pop_back();
occupied_compactparkingspaces.push_back(_ps);
}
else
{
cout<<"No compact spaces available"<<endl;
}
}
else {
if (vacant_regularparkingspaces.size()!=0) {
_ps.parkvehicle(_v);
vacant_regularparkingspaces.pop_back();
occupied_regularparkingspaces.push_back(_ps);
}
else {
cout<<"No regular spaces available"<<endl;
}
}
}
void ParkingLot::ReleaseVehicle(Vehicle _v, ParkingSpace& _ps, std::string ps)
{
_ps.vacant=1;
_ps.vehicle= Null;
if (ps=="Handicapped") {
if (occupied_regularparkingspaces.size()!=0) {
vacant_handicapparkingspaces.push_back(_ps);
occupied_handicapparkingspaces.pop_back();
}
else {
cout<<"Unable to release any handicapped spaces"<<endl;
}
}
else if (ps=="Compact") {
if (occupied_regularparkingspaces.size()!=0) {
_ps.parkvehicle(_v);
vacant_compactparkingspaces.pop_back(_ps);
occupied_compactparkingspaces.push_back();
}
else {
cout<<"Unable to release any compact spaces"<<endl;
}
}
else {
if (occupied_regularparkingspaces.size()!=0) {
_ps.parkvehicle(_v);
vacant_regularparkingspaces.pop_back(_ps);
occupied_regularparkingspaces.push_back();
}
else {
cout<<"Unable to release any regular spaces"<<endl;
}
}
}
void ParkingLot::getOccupiedSpaces() {
cout<<"Occupied handicap spaces: "<<occupied_handicapparkingspaces.size()<<endl;
cout<<"Vacant handicap spaces: "<<vacant_handicapparkingspaces.size()<<endl;
cout<<"Occupied compact spaces: "<<occupied_compactparkingspaces.size()<<endl;
cout<<"Vacant compact spaces: "<<vacant_compactparkingspaces.size()<<endl;
cout<<"Occupied regular spaces: "<<occupied_regularparkingspaces.size()<<endl;
}
ParkingSpace.h
:#pragma once
#include "Vehicle.h"
class ParkingSpace
{
public:
ParkingSpace();
~ParkingSpace();
virtual void parkvehicle()=0;
private:
Vehicle *vehicle;
bool vacant;
};
HandicappedParkingSpace.h
:#pragma once
#include "ParkingSpace.h"
class HandicappedParkingSpace : public ParkingSpace
{
public:
HandicappedParkingSpace(int _vacant, Vehicle* _v) {
this->vacant=_vacant;
this->vehicle=_v;
}
~HandicappedParkingSpace();
void parkvehicle(Vehicle _v) {
this->vacant=0;
this->vehicle=_v;
}
private:
int vacant;
Vehicle *vehicle;
};
RegularParkingSpace.h
:#pragma once
#include "ParkingSpace.h"
class RegularParkingSpace : public ParkingSpace
{
public:
RegularParkingSpace(int _vacant, Vehicle* _v) {
this->vacant=_vacant;
this->vehicle=_v;
}
~RegularParkingSpace();
void parkvehicle(Vehicle _v) {
this->vacant=0;
this->vehicle=_v;
}
private:
int vacant;
Vehicle *vehicle;
};
CompactParkingSpace.h
:#pragma once
#include "ParkingSpace.h"
class CompactParkingSpace : public ParkingSpace
{
public:
CompactParkingSpace(int _vacant, Vehicle* _v) {
this->vacant=_vacant;
this->vehicle=_v;
}
~CompactParkingSpace();
void parkvehicle(Vehicle _v) {
this->vacant=0;
this->vehicle=_v;
}
private:
int vacant;
Vehicle *vehicle;
};
main.cpp
:#include "ParkingLot.h"
#include "HandicappedParkingSpace.h"
#include "RegularParkingSpace.h"
#include "CompactParkingSpace.h"
#include "Car.h"
#include <iostream>
using namespace std;
int main()
{
ParkingLot PL;
Car c1;
HandicappedParkingSpace HPS;
PL.ParkVehicle(c1, HPS, "Handicapped");
Car c2;
CompactParkingSpace CPS;
PL.ParkVehicle(c2, CPS, "Handicapped");
PL.getOccupiedSpaces();
cout<<"FINISHED"<<endl;
//delete d;
return 0;
}
这是我得到的错误:https://pastebin.com/p0vzb0Mz(错误很长,我无法在此处发布)
有人能帮忙吗?
编辑:
我修改了
ParkingLot.cpp
,所以现在看起来像#pragma once
#include <iostream>
#include <string>
#include <vector>
#include "ParkingLot.h"
using namespace std;
ParkingLot::ParkingLot() {
for (int i=0; i<5; i++) {
HandicappedParkingSpace HPS(1, nullptr);
vacant_handicapparkingspaces.push_back(HPS);
}
for (int i=0; i<5; i++) {
CompactParkingSpace CPS(1, nullptr);
vacant_compactparkingspaces.push_back(CPS);
}
for (int i=0; i<5; i++) {
RegularParkingSpace RPS(1, nullptr);
vacant_regularparkingspaces.push_back(RPS);
}
cout<<"finished parking lot"<<endl;
}
void ParkingLot::ParkVehicle(Vehicle _v, ParkingSpace& _ps, std::string ps)
{
if (ps=="Handicapped") {
if (vacant_handicapparkingspaces.size()!=0) {
_ps.parkvehicle(_v);
vacant_handicapparkingspaces.pop_back();
occupied_handicapparkingspaces.push_back(_ps);
}
else
{
cout<<"No handicapped spaces available"<<endl;
}
}
else if (ps=="Compact") {
if (vacant_compactparkingspaces.size()!=0) {
_ps.parkvehicle(_v);
vacant_compactparkingspaces.pop_back();
occupied_compactparkingspaces.push_back(_ps);
}
else
{
cout<<"No compact spaces available"<<endl;
}
}
else {
if (vacant_regularparkingspaces.size()!=0) {
_ps.parkvehicle(_v);
vacant_regularparkingspaces.pop_back();
occupied_regularparkingspaces.push_back(_ps);
}
else {
cout<<"No regular spaces available"<<endl;
}
}
}
void ParkingLot::ReleaseVehicle(Vehicle _v, ParkingSpace& _ps, std::string ps)
{
//_ps.vacant=1;
//_ps.vehicle= nullptr;
_ps.setVehicle(1, nullptr);
if (ps=="Handicapped") {
if (occupied_regularparkingspaces.size()!=0) {
vacant_handicapparkingspaces.push_back(_ps);
occupied_handicapparkingspaces.pop_back();
}
else {
cout<<"Unable to release any handicapped spaces"<<endl;
}
}
else if (ps=="Compact") {
if (occupied_regularparkingspaces.size()!=0) {
_ps.parkvehicle(_v);
vacant_compactparkingspaces.push_back(_ps);
occupied_compactparkingspaces.pop_back();
}
else {
cout<<"Unable to release any compact spaces"<<endl;
}
}
else {
if (occupied_regularparkingspaces.size()!=0) {
_ps.parkvehicle(_v);
vacant_regularparkingspaces.push_back(_ps);
occupied_regularparkingspaces.pop_back();
}
else {
cout<<"Unable to release any regular spaces"<<endl;
}
}
}
void ParkingLot::getOccupiedSpaces() {
cout<<"Occupied handicap spaces: "<<occupied_handicapparkingspaces.size()<<endl;
cout<<"Vacant handicap spaces: "<<vacant_handicapparkingspaces.size()<<endl;
cout<<"Occupied compact spaces: "<<occupied_compactparkingspaces.size()<<endl;
cout<<"Vacant compact spaces: "<<vacant_compactparkingspaces.size()<<endl;
cout<<"Occupied regular spaces: "<<occupied_regularparkingspaces.size()<<endl;
cout<<"Vacant regular spaces: "<<vacant_regularparkingspaces.size()<<endl;
}
ParkingSpace.h
现在#pragma once
#include "Vehicle.h"
class ParkingSpace
{
public:
ParkingSpace();
~ParkingSpace();
virtual void parkvehicle(Vehicle _v)=0;
virtual void setVehicle(bool vacant, Vehicle _v);
private:
Vehicle vehicle;
bool vacant;
};
HandicappedParkingSpace.h
现在#pragma once
#include "ParkingSpace.h"
class HandicappedParkingSpace : public ParkingSpace
{
public:
HandicappedParkingSpace(int _vacant, Vehicle& _v) {
this->vacant=_vacant;
this->vehicle=_v;
}
~HandicappedParkingSpace();
void parkvehicle(Vehicle _v) {
this->vacant=0;
this->vehicle=_v;
}
void setVehicle(bool _vacant, Vehicle _v) {
this->vacant=_vacant;
this->vehicle= _v;
}
private:
int vacant;
Vehicle vehicle;
};
RegularParkingSpace.h
现在#pragma once
#include "ParkingSpace.h"
class RegularParkingSpace : public ParkingSpace
{
public:
RegularParkingSpace(int _vacant, Vehicle& _v) {
this->vacant=_vacant;
this->vehicle=_v;
}
~RegularParkingSpace();
void parkvehicle(Vehicle _v) {
this->vacant=0;
this->vehicle=_v;
}
void setVehicle(bool _vacant, Vehicle _v) {
this->vacant=_vacant;
this->vehicle= _v;
}
private:
int vacant;
Vehicle vehicle;
};
CompactParkingSpace.h
现在#pragma once
#include "ParkingSpace.h"
class CompactParkingSpace : public ParkingSpace
{
public:
CompactParkingSpace(int _vacant, Vehicle& _v) {
this->vacant=_vacant;
this->vehicle=_v;
}
~CompactParkingSpace();
void parkvehicle(Vehicle _v) {
this->vacant=0;
this->vehicle=_v;
}
void setVehicle(bool _vacant, Vehicle _v) {
this->vacant=_vacant;
this->vehicle= _v;
}
private:
int vacant;
Vehicle vehicle;
};
main.cpp
现在#include "ParkingLot.h"
#include "HandicappedParkingSpace.h"
#include "RegularParkingSpace.h"
#include "CompactParkingSpace.h"
#include "Car.h"
#include <iostream>
using namespace std;
int main()
{
ParkingLot PL;
Car c1;
HandicappedParkingSpace HPS(1, nullptr);
PL.ParkVehicle(c1, HPS, "Handicapped");
Car c2;
CompactParkingSpace CPS(1, nullptr);
PL.ParkVehicle(c2, CPS, "Handicapped");
PL.getOccupiedSpaces();
cout<<"FINISHED"<<endl;
//delete d;
return 0;
}
但是现在我得到了这些错误,看来它们大多与
nullptr
有关:https://pastebin.com/hVdcSc63我以为
push_back
错误是因为我需要将std:vector
之类的occupied_handicapparkingspaces
从<HandicappedParkingSpace>
更改为<HandicappedParkingSpace&>
,然后出现此错误:https://pastebin.com/QkWC6SRk 最佳答案
无法在C ++中为停车场OOP声明抽象类型的变量
由于virtual void parkvehicle()=0;
,ParkingSpace是一个抽象类,HandicappedParkingSpace继承了ParkingSpace而未定义parkvehicle,因此它也是一个抽象类,因此您无法实例化HandicappedParkingSpace,这就是为什么出现有关HandicappedParkingSpace HPS(1, Null);
和等效情况的错误的原因
注意还必须将NULL替换为NULL或更佳的nullptr,并且您还有很多其他错误,我只是回答您的标题...
编辑后
我建议您不要混用using namespace std;
和std::xxx
,如果使用std前缀,请删除所有使用的内容
ParkingLot.cpp:13:41:错误:没有匹配的函数可调用“ HandicappedParkingSpace :: HandicappedParkingSpace(int,std :: nullptr_t)”
残障人士停车位HPS(1,nullptr);
HandicappedParkingSpace的构造函数的第二个参数的类型为Vehicle&
,与nulltr不兼容,您混淆了Vehicle&
和Vehicle*
,只有指针可以将nulltr赋值
我以为push_back错误是因为我需要将std:vectors(例如,占用的手掌停车空间)从<HandicappedParkingSpace>
更改为<HandicappedParkingSpace&>
不,问题是您在occupied_handicapparkingspaces.push_back(_ps);
是ps_
时执行了std::string
,而std::string
不是HandicappedParkingSpace,并且没有从std::string
到HandicappedParkingSpace的转换
关于c++ - 无法在C++中为 parking 场OOP声明抽象类型的变量,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/54997049/