C/C++动态链接

 

动态库头文件：sales_item.h

#ifndef SALES_ITEM_H

#define SALES_ITEM_H

#include <iostream>

class Sales_item {

public:

        double avg_price() const;

        void setUnits_sold(int units_sold2);

        void setRevenue(double revenue2);

        bool same_isbn(const Sales_item &rhs) const {

                return isbn == rhs.isbn;

        }

        Sales_item():units_sold(0), revenue(0.0){}



private:

        std::string isbn;

        unsigned units_sold;

        double revenue;

};

#endif 

 

编译动态链接库 sales_item.cpp：

#编译源文件

g++ -c sales_item.cpp -o bin/sales_item.obj

#编译动态链接库

g++ -shared -o bin/sales_item.so bin/sales_item.obj

 

#include "sales_item.h"

double Sales_item::avg_price() const {

        if (units_sold)

                return revenue/units_sold;

        else

                return 0;

}



void Sales_item::setUnits_sold(int units_sold2) {

        units_sold = units_sold2;

}



void Sales_item::setRevenue(double revenue2) {

        revenue = revenue2;

}

 

调用：

g++ test_sales_item.cpp bin/sales_item.so -o bin/test_sales_item.o
./bin/test_sales_item.o

 

#include <iostream>

#include "sales_item.h"

int main(){

        Sales_item item;

        item.setUnits_sold(300);

        item.setRevenue(2393.5);

        double result = item.avg_price();

        std::cout << result << std::endl;

        return 0;

}

 

参考：http://www.cnblogs.com/zhoutian6214/archive/2008/11/11/1331646.html