C++ string类insert用法总结

basic_string& insert( size_type index, size_type count, CharT ch ); 在index位置插入count个字符ch	string str = "meihao"; string sstr = str.insert(0,2,'a'); cout<<sstr<<endl;   //aameihao
basic_string& insert( size_type index, const CharT* s ); index位置插入一个常量字符串	string str = "meihao"; string sstr = str.insert(1,"hello~"); cout<<sstr<<endl;   //mhello~eihao
basic_string& insert( size_type index, const CharT* s, size_type count ); index位置插入常量字符串中的count个字符	string str = "meihao"; string sstr = str.insert(1,"hello~",3); cout<<sstr<<endl;  //mheleihao
basic_string& insert( size_type index, const basic_string& str ); index位置插入常量string	string str = "meihao"; string sstr = str.insert(1,str); cout<<sstr<<endl;  //mmeihaoeihao
basic_string& insert( size_type index, const basic_string& str,                       size_type index_str, size_type count ); index位置插入常量str的从index_str开始的count个字符	string str1 = "meihao"; string str2 = "hello~"; string sstr = str2.insert(6,str1,3,3); cout<<sstr<<endl;  //hello~hao
basic_string& insert( size_type index, const basic_string& str,                       size_type index_str, size_type count = npos); index位置插入常量str从index_str开始的count个字符，count可以表示的最大值为npos.这个函数不构成重载 npos表示一个常数，表示size_t的最大值，string的find函数如果未找到指定字符，返回的就是一个npos	string str1 = "meihao"; string str2 = "hello~"; string sstr = str2.insert(6,str1,3,string::npos); cout<<sstr<<endl;  //hello~hao cout<<string::npos<<endl;  //4294967295
iterator insert( iterator pos, CharT ch ); iterator insert( const_iterator pos, CharT ch );	string str1 = "meihao"; string::iterator it = str1.insert(str1.begin(),'a'); // string::iterator it = str1.insert(str1.cbegin(),'a');  //第二种 cout<<str1<<endl;  //ameihao cout<<*it<<endl;  //a
void insert( iterator pos, size_type count, CharT ch ); 迭代器指向的pos位置插入count个字符ch	string str1 = "meihao"; str1.insert(++str1.begin(),2,'a'); cout<<str1<<endl;  //maaeihao
iterator insert( const_iterator pos, size_type count, CharT ch ); 迭代器指向的pos位置插入count个字符ch	string str1 = "meihao"; string::iterator it = str1.insert(++str1.cbegin(),2,'a');  //和上面的可以混用 cout<<str1<<endl;  //maaeihao
void insert( iterator pos, InputIt first, InputIt last ); iterator insert( const_iterator pos, InputIt first, InputIt last );	string str1 = "meihao"; string str2 = "hello"; //string::iterator it = str1.insert(str1.begin(),str2.begin(),str2.end()); string::iterator it = str1.insert(str1.begin(),std::begin(str2),std::end(str2)); cout<<str1<<endl;  //hellomeihao cout<<*it<<endl;  //h