android c++复制构造函数使用示例代码

class PeopleFlow{ int age=0; string gender; public: PeopleFlow(PeopleFlow &people_flow){ this->age=people_flow.age; this->gender=people_flow.gender; } PeopleFlow(){ this->age=20; this->gender="male"; } string to_string(){ string str="年龄："+::to_string(this->age)+" 性别："+this->gender; return str; } }; class Test{ Tool tool; public: string test(string str,int x){ string sum=""; PeopleFlow p; return p.to_string(); } }; extern "C" JNIEXPORT jstring JNICALL Java_com_example_inspiret_framework_test_TestFragment_get_1string(JNIEnv *env, jobject thiz,jstring str_) { // TODO: implement get_string() Tool tool; Test t; string str=t.test(tool.jstr2str(str_,env),3); jstring jstr=tool.str2jstr(str,env); return jstr; }

效果：

这是默认构造函数的示例，后面这个就是复制构造函数了：

class PeopleFlow{ public: int age=0; string gender; PeopleFlow(PeopleFlow &people_flow){ this->age=people_flow.age; this->gender=people_flow.gender; } PeopleFlow(){ this->age=20; this->gender="male"; } string to_string(){ string str="年龄："+::to_string(this->age)+" 性别："+this->gender; return str; } }; class Test{ Tool tool; public: string test(string str,int x){ string sum=""; PeopleFlow p; p.age=100; p.gender="female"; PeopleFlow p2=PeopleFlow(p); return p2.to_string(); } };