| 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
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| 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
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| 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
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| 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
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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
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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
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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
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| 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
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| 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
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| 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
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| 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
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