错误：从'int *'到'unsigned int *'的无效转换[-fpermissive] | -公交车模拟程序

Question

您好，我在这里尝试使用公交模拟程序。但是，每次我运行它时，它在第211行以及第298行上都会一直显示D:\programs\bus_sim\main.cpp|211|error: invalid conversion from 'int*' to 'unsigned int*' [-fpermissive]|。这是我第一次从事模拟程序的研究，因此我对此有些迷失。该程序应该能够模拟5辆公共汽车在其停靠点上的移动，同时还能登上乘客，而且乘客数量是随机产生的。

#include <cstdlib>
#include <ctime>
#include <iostream>
#include<math.h>
#include <queue>
#include <vector>
//Vector of Queues for passengers
typedef std::queue<int> Q;
typedef std::vector<Q> vecQ;
//Constants
#define stop_time 28800
#define total_bus 5
#define total_stop 15
#define time_bet_stops 300
#define mean_rate 2/60
#define M 65536
//Wvent Class
class event{
public:
event(double t) : time(t)
{ }
virtual void Processevent() = 0;
const double time;
};
//Compare events for Priority Queue
struct eventCompare{
bool operator() (const event *left, const event *right) const {
    return left->time > right->time;
  }
 };
 //Simulation Class
 class simulate{
 public:
 simulate() : time (0), eventQueue()
 { }
void run();
void Scheduleevent(event *newevent){
    eventQueue.push(newevent);
}
double time;
protected:
std::priority_queue < event *, std::vector<event *, std::allocator<event *> >, eventCompare > 
  eventQueue;};

//Run Simulation
void simulate::run(){
do{
    time++;
    if (eventQueue.empty())
        std::cout << "Empty Queue!" << std::endl;
    else{
        event *nextevent = eventQueue.top();
        eventQueue.pop();
        time = nextevent->time;
        nextevent->Processevent();
        delete nextevent;

    }

 } while (time < stop_time);
}
 //Bus Simulation Class
 class bus_simul : public simulate{
 public:
 bus_simul() :simulate()
{ }
void person(vecQ p, int stop_id);
void arrival(int bus_id, int stop_id, vecQ passQ);
void boarder(vecQ p, int stop_id, int bus_id);
void random();
void runsim();
vecQ passQ;
std::vector<int> Bus_id;
int bus_id;
int stop_id;
double mean_interarrival_rate;
}busSim;
 //Boarder event
class boarderevent : public event{
 public:
boarderevent(double t, int stop_id, vecQ passQ, int bus_id) : event(t)
{ }
virtual void Processevent();

private:
double t;
int stop_id;
int bus_id;
vecQ passQ;
double total_time;
  };
 void boarderevent::Processevent(){
    busSim.boarder(busSim.passQ, busSim.stop_id, busSim.bus_id);
}

 //Arrival event
class arrivalevent : public event{
public:
arrivalevent(double t, unsigned int *bus_id, unsigned int *stop_id, vecQ *passQ) : event(t)
{ }
virtual void Processevent();
private:
double t;
unsigned int *bus_id;
unsigned int *stop_id;
vecQ *passQ;
};

void arrivalevent::Processevent(){
double t;
if (passQ[*stop_id].empty()){
    std::cout << "The Queue at stop : " << *stop_id << " is Empty." << std::endl;
    busSim.stop_id = *stop_id + 1;
    t = time + time_bet_stops;
    busSim.Scheduleevent(new arrivalevent(t, bus_id, stop_id, passQ));
}
else{
    busSim.arrival(*bus_id, *stop_id, *passQ);
  }
 }
 //Person event
 class personevent : public event{
 public:
personevent(unsigned int t, vecQ passQ, int stop_id) : event(t)
{ }
virtual void Processevent();
private:
//vecQ passQ;
//int stop_id;
double mean_interarrival_rate;
};

 void personevent::Processevent(){
 busSim.person(busSim.passQ, busSim.stop_id);
 mean_interarrival_rate = 1 / mean_rate;
 busSim.Scheduleevent(new personevent(time + (mean_interarrival_rate * static_cast<double>((rand() % M))),busSim.passQ,busSim.stop_id));
}

 void bus_simul::person(vecQ passQ, int stop_id){
 passQ[stop_id].push(1);
 std::cout << "One person arrived at stop : " << stop_id << " at time : " << time << std::endl;
 }

 void bus_simul::arrival(int bus_id, int stop_id, vecQ passQ){

 std::cout << "Bus : " << bus_id << " arrived at stop : " << stop_id << " at time : " << time << std::endl;
busSim.Scheduleevent(new boarderevent(time, stop_id, passQ, bus_id));
}

void bus_simul::boarder(vecQ passQ, int stop_id, int bus_id){
if (passQ[stop_id].empty()){
    std::cout << "The Queue at stop : " << stop_id << " is Empty." << std::endl;
    stop_id = stop_id + 1;
    busSim.Scheduleevent(new arrivalevent(time + time_bet_stops, &bus_id, &stop_id, &passQ));
}
else{
    do{
        std::cout << "Passenger boarded bus : " << bus_id << " at stop : " << stop_id << std::endl;
        passQ[stop_id].pop();
        time = time + 2;
        busSim.Scheduleevent(new boarderevent(time, stop_id, passQ, bus_id));
    } while (passQ[stop_id].empty());
  }
 }
 //Random Function
void bus_simul::random(){
srand(static_cast<unsigned int>(clock()));
}

//Initialize Bus
class Init_bus : public event{
 public:
Init_bus(double t, int bus_id, int stop_id, vecQ passQ) :event(t)
{ }
virtual void Processevent();

private:
double t;
unsigned int bus_id = 0;
unsigned int stop_id = 0;
vecQ passQ;
int j = 1;
std::vector<int> Bus_id;
};

void Init_bus::Processevent(){
bus_simul busi;

 j = 1;

std::cout << "The Initial Position is :" << std::endl;

//busi.Scheduleevent(new arrivalevent(time, bus_id, stop_id, passQ));

std::cout << "\nBus : " << busSim.bus_id << " @ " << busSim.stop_id << std::endl;
std::cout << std::endl;
}

//Set Random Seed
void bus_simul::runsim(){
random();
}


//Main Function
int main(){

bus_simul bs;
int j = 0;

bs.runsim();
double t = 0;

//Initialize Passenger Queue
for (int i = 0; i < total_stop; i++){
    bs.passQ.push_back(Q());
    bs.passQ[i].push(j);
    //bs.Scheduleevent(new personevent(0, bs.passQ, i));

}

//Initial Bus Arrival event
for (int i = 0; i < total_bus; i++){
    //Bus_id.push_back(i);
    bs.bus_id = i + 1;
    bs.stop_id = j;

    bs.Scheduleevent(new arrivalevent(t, &bs.bus_id, &bs.stop_id, &bs.passQ));

    j = j + 3;

}

//Run Simulation
bs.run();

//Press any key to continue
system("Pause");
//Return 0 indicates no error
return 0;
 }

这是来自控制台的整个构建消息

 ||=== Build: Debug in bus_sim (compiler: GNU GCC Compiler) ===|
D:\programs\bus_sim\main.cpp||In member function 'void simulate::run()':|
D:\programs\bus_sim\main.cpp|79|warning: deleting object of abstract class type 'event' which has non-virtual destructor will cause undefined behaviour [-Wdelete-non-virtual-dtor]|
D:\programs\bus_sim\main.cpp|246|warning: non-static data member initializers only available with -std=c++11 or -std=gnu++11|
D:\programs\bus_sim\main.cpp|247|warning: non-static data member initializers only available with -std=c++11 or -std=gnu++11|
D:\programs\bus_sim\main.cpp|249|warning: non-static data member initializers only available with -std=c++11 or -std=gnu++11|
D:\programs\bus_sim\main.cpp||In function 'int main()':|
D:\programs\bus_sim\main.cpp|298|error: invalid conversion from 'int*' to 'unsigned int*' [-fpermissive]|
D:\programs\bus_sim\main.cpp|136|note:   initializing argument 2 of 'arrivalevent::arrivalevent(double, unsigned int*, unsigned int*, vecQ*)'|
D:\programs\bus_sim\main.cpp|298|error: invalid conversion from 'int*' to 'unsigned int*' [-fpermissive]|
D:\programs\bus_sim\main.cpp|136|note:   initializing argument 3 of 'arrivalevent::arrivalevent(double, unsigned int*, unsigned int*, vecQ*)'|
||=== Build failed: 2 error(s), 4 warning(s) (0 minute(s), 0 second(s)) ===|

Answer 1

输出日志很容易说明。您要将int*作为第二个参数传递给arrivalevent::arrivalevent函数。您必须先将变量转换为unsigned int *：

static_cast<unsigned int*>(myVar);

同样的东西也适用于第三个参数。