basic_string::append

添加字符为字符串的末尾。

basic_string<CharType, Traits, Allocator>& append(
    const value_type* _Ptr
);
basic_string<CharType, Traits, Allocator>& append(
    const value_type* _Ptr,
    size_type _Count
);
basic_string<CharType, Traits, Allocator>& append(
    const basic_string<CharType, Traits, Allocator>& _Str,
    size_type _Off,
    size_type _Count
);
basic_string<CharType, Traits, Allocator>& append(
    const basic_string<CharType, Traits, Allocator>& _Str
);
basic_string<CharType, Traits, Allocator>& append(
    size_type _Count, 
    value_type _Ch
);
template<class InputIterator>
    basic_string<CharType, Traits, Allocator>& append(
        InputIterator _First, 
        InputIterator _Last
    );
basic_string<CharType, Traits, Allocator>& append(
    const_pointer _First,
    const_pointer _Last
);
basic_string<CharType, Traits, Allocator>& append(
    const_iterator _First,
    const_iterator _Last
);

参数

• _Ptr
  追加的C字符串。

• _Str
  字符追加的字符串。

• _Off
  源字符串的索引提供的字符追加。

• _Count
  从源字符串将追加的，至多，字符数。

• _Ch
  追加的字符值。

• _First
  解决输入的迭代器在追加范围的第一个元素。

• _Last
  解决输入迭代器、const_pointer或的const_iterator位置于最后一个元素外在追加的大小。

返回值

对附加有字符的字符串对象的引用传递的成员函数。

备注

使用 operator+= 或成员函数 append 或 push_back，字符可能会追加到字符串。 并在多个参数 append 成员函数允许字符串的特定部分提供将时，指定operator+= 追加单一参数值。

示例

// basic_string_append.cpp
// compile with: /EHsc
#include <string>
#include <iostream>

int main( ) 
{
   using namespace std;

   // The first member function
   // appending a C-string to a string
   string str1a ( "Hello " );
   cout << "The original string str1 is: " << str1a << endl;
   const char *cstr1a = "Out There ";
   cout << "The C-string cstr1a is: " << cstr1a << endl;
   str1a.append ( cstr1a );
   cout << "Appending the C-string cstr1a to string str1 gives: " 
        << str1a << "." << endl << endl;

   // The second member function
   // appending part of a C-string to a string
   string str1b ( "Hello " );
   cout << "The string str1b is: " << str1b << endl;
   const char *cstr1b = "Out There ";
   cout << "The C-string cstr1b is: " << cstr1b << endl;
   str1b.append ( cstr1b , 3 );
   cout << "Appending the 1st part of the C-string cstr1b "
        << "to string str1 gives: " << str1b << "." 
        << endl << endl;

   // The third member function
   // appending part of one string to another
   string str1c ( "Hello " ), str2c ( "Wide World " );
   cout << "The string str2c is: " << str2c << endl;
   str1c.append ( str2c , 5 , 5 );
   cout << "The appended string str1 is: " 
        << str1c << "." << endl << endl;

   // The fourth member function
   // appending one string to another in two ways,
   // comparing append and operator [ ]
   string str1d ( "Hello " ), str2d ( "Wide " ), str3d ( "World " );
   cout << "The  string str2d is: " << str2d << endl;
   str1d.append ( str2d );
   cout << "The appended string str1d is: " 
        << str1d << "." << endl;
   str1d += str3d;
   cout << "The doubly appended strig str1 is: " 
        << str1d << "." << endl << endl;

   // The fifth member function
   // appending characters to a string
   string str1e ( "Hello " );
   str1e.append ( 4 , '!' );
   cout << "The string str1 appended with exclamations is: " 
        << str1e << endl << endl;

   // The sixth member function
   // appending a range of one string to another
   string str1f ( "Hello " ), str2f ( "Wide World " );
   cout << "The string str2f is: " << str2f << endl;
   str1f.append ( str2f.begin ( ) + 5 , str2f.end ( ) - 1 );
   cout << "The appended string str1 is: " 
        << str1f << "." << endl << endl;
}

要求

标头: <string>

命名空间: std

请参见

参考

basic_string Class

basic_string::append (STL Samples)