vector存放结构体数据的2种方法

若是要在Vector容器中存放结构体类型的变量,常常见到两种存放方式.ios

方式一:放入这个结构体类型变量的副本。spa

方式二:放入指向这个结构体类型变量的指针。.net

假设结构体类型变量是这样的,3d

typedef struct student{ char school_name[100]; char gender; int age; bool is_absent; } StudentInfo;

那么,方式一和方式二的实现分别以下所示:指针

/*[方式一] 结构体放栈中,vector中放副本---------------------*/ #include <iostream> #include <string> #include <vector> typedef struct student{ char school_name[100]; char gender; int age; bool is_absent; } StudentInfo; typedefstd::vector<StudentInfo> StudentInfoVec; void print(StudentInfoVec* stduentinfovec){ for (int j=0;j<(*stduentinfovec).size();j++) { std::cout<< (*stduentinfovec)[j].school_name<<"\t"<< (*stduentinfovec)[j].gender<<"\t"<< (*stduentinfovec)[j].age<<"\t"<< (*stduentinfovec)[j].is_absent<<"\t"<<std::endl; } return; } int main(){ StudentInfo micheal={"Micheal",'m',18,false}; StudentInfo cherry={"Cherry",'f',16,true}; StudentInfoVec studentinfovec; studentinfovec.push_back(micheal); studentinfovec.push_back(cherry); print(&studentinfovec); return 0; } 

方式一的输出结果
code

/*[方式二] 结构体放入堆中,vector中放指针---------------------*/ typedef struct student{ char* school_name; char gender; int age; bool is_absent; } StudentInfo; typedefstd::vector<StudentInfo*> StudentInfoPtrVec; void print(StudentInfoPtrVec*stduentinfoptrvec){ for (int j=0;j<(*stduentinfoptrvec).size();j++) { std::cout<< (*stduentinfoptrvec)[j]->school_name<<"\t"<< (*stduentinfoptrvec)[j]->gender<<"\t"<< (*stduentinfoptrvec)[j]->age<<"\t"<< (*stduentinfoptrvec)[j]->is_absent<<"\t"<<std::endl; } return; } int main(){ StudentInfoPtrVec studentinfoptrvec; char* p_char_1=NULL; p_char_1=new char[100]; strcpy(p_char_1,"Micheal"); StudentInfo* p_student_1=new StudentInfo; p_student_1->school_name=p_char_1; p_student_1->gender='m'; p_student_1->age=18; p_student_1->is_absent=false; studentinfoptrvec.push_back(p_student_1); char* p_char_2=NULL; p_char_2=new char[100]; strcpy(p_char_2,"Cherry"); StudentInfo* p_student_2=new StudentInfo; p_student_2->school_name=p_char_2; p_student_2->gender='f'; p_student_2->age=16; p_student_2->is_absent=false; studentinfoptrvec.push_back(p_student_2); print(&studentinfoptrvec); delete p_char_1; delete p_student_1; delete p_char_2; delete p_student_2; return 0; } 

方式二的输出结果,同上,依然是blog

【转】https://blog.csdn.net/feliciafay/article/details/9128385ci

 

总结注意:类型的typedef 定义了类型  还须要定义类型的变量get

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