operator!= (<string>)

如果在运算符左侧的字符串对象与右侧的字符串，对象不相等测试。

template<class CharType, class Traits, class Allocator>
   bool operator!=(
      const basic_string<CharType, Traits, Allocator>& _Left,
      const basic_string<CharType, Traits, Allocator>& _Right
   );
template<class CharType, class Traits, class Allocator>
   bool operator!=(
      const basic_string<CharType, Traits, Allocator>& _Left,
      const CharType *_Right
   );
template<class CharType, class Traits, class Allocator>
   bool operator!=(
      const CharType *_Left,
      const basic_string<CharType, Traits, Allocator>& _Right
   );

参数

• _Left
  对.样式字符串或类型 basic_string 对象要比较。

• _Right
  对.样式字符串或类型 basic_string 对象要比较。

返回值

true，如果在运算符左侧的字符串对象与右侧的字符串对象不是字典地相等;否则 false。

备注

在字符串对象之间的比较依据的字符的pairwise字典比较。两个字符串相等，则它们具有字符数相同，并且其各自的字符值相同。否则为不相等。

示例

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

int main( ) 
{
   using namespace std;

   // Declaring an objects of type basic_string<char>
   string s1 ( "pluck" );
   string s2 ( "strum" );
   cout << "The basic_string s1 = " << s1 << "." << endl;
   cout << "The basic_string s2 = " << s2 << "." << endl;

   // Declaring a C-style string
   char *s3 = "pluck";
   cout << "The C-style string s3 = " << s3 << "." << endl;

   // First member function: comparison between left-side object
   // of type basic_string & right-side object of type basic_string
   if ( s1 != s2 )
      cout << "The strings s1 & s2 are not equal." << endl;
   else
      cout << "The strings s1 & s2 are equal." << endl;

   // Second member function: comparison between left-side object
   // of type basic_string & right-side object of C-syle string type
   if ( s1 != s3 )
      cout << "The strings s1 & s3 are not equal." << endl;
   else
      cout << "The strings s1 & s3 are equal." << endl;

   // Third member function: comparison between left-side object
   // of C-syle string type & right-side object of type basic_string
   if ( s3 != s2 )
      cout << "The strings s3 & s2 are not equal." << endl;
   else
      cout << "The strings s3 & s2 are equal." << endl;
}

要求

标头: <string>

命名空间: std

请参见

参考

string::operator!=