如果要在Vector容器中存放结构体类型的变量,经常见到两种存放方式.
方式一:放入这个结构体类型变量的副本。
方式二:放入指向这个结构体类型变量的指针。
假设结构体类型变量是这样的,
typedef struct student{
char school_name[];
char gender;
int age;
bool is_absent;
} StudentInfo;
那么,方式一和方式二的实现分别如下所示:
/*[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[];
char gender;
int age;
bool is_absent;
} StudentInfo; typedefstd::vector<StudentInfo> StudentInfoVec; void print(StudentInfoVec* stduentinfovec){
for (int j=;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',,false};
StudentInfo cherry={"Cherry",'f',,true};
StudentInfoVec studentinfovec;
studentinfovec.push_back(micheal);
studentinfovec.push_back(cherry);
print(&studentinfovec);
return ;
}
方式一的输出结果
/*[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=;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[];
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=;
p_student_1->is_absent=false;
studentinfoptrvec.push_back(p_student_1); char* p_char_2=NULL;
p_char_2=new char[];
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=;
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 ; }
方式二的输出结果,同上,依然是
【转】https://blog.****.net/feliciafay/article/details/9128385
总结注意:类型的typedef 定义了类型 还需要定义类型的变量