向字符串追加字符。
basic_string<CharType, Traits, Allocator>& operator+=(
value_type _Ch
);
basic_string<CharType, Traits, Allocator>& operator+=(
const value_type* _Ptr
);
basic_string<CharType, Traits, Allocator>& operator+=(
const basic_string<CharType, Traits, Allocator>& _Right
);
参数
_Ch
追加的字符。_Ptr
追加的 C# 字符串的字符。_Right
追加的字符串的字符。
返回值
对附加有成员函数传递字符的字符串对象的引用。
备注
使用 operator+= 或成员函数 追加 或 push_back，字符可能追加到字符串。 追加 operator+= 单参数值，则多个附加参数函数允许字符串特定部分将指定的成员时。
示例
// basic_string_op_app.cpp
// compile with: /EHsc
#include <string>
#include <iostream>
int main( )
{
using namespace std;
// The first member function
// appending a single character to a string
string str1a ( "Hello" );
cout << "The original string str1 is: " << str1a << endl;
str1a += '!' ;
cout << "The string str1 appended with an exclamation is: "
<< str1a << endl << endl;
// The second member function
// appending a C-string to a string
string str1b ( "Hello " );
const char *cstr1b = "Out There";
cout << "The C-string cstr1b is: " << cstr1b << endl;
str1b += cstr1b;
cout << "Appending the C-string cstr1b to string str1 gives: "
<< str1b << "." << endl << endl;
// The third 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;
}
要求
标头：< 字符串>
命名空间: std