char_traits::lt

測試一個字元是否小於另一個。

static bool lt( 
   const char_type& _Ch1,  
   const char_type& _Ch2  
);

參數

• _Ch1
  為小於要測試的第一個字元。

• _Ch2
  為小於要測試的第二個字元。

傳回值

true ，如果第一個字元小於第二個字元;否則 false。

範例

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

int main( ) 
{
   using namespace std;
   char_traits<char>::char_type ch1 =  'x';
   char_traits<char>::char_type ch2 =  'y';
   char_traits<char>::char_type ch3 =  'z';

   // Testing for less than
   bool b1 = char_traits<char>::lt ( ch1 , ch2 );
   if ( b1 )
      cout << "The character ch1 is less than "
           << "the character ch2." << endl;
   else
      cout << "The character ch1 is not less "
           << "than the character ch2." << endl;

   // An equivalent and alternatively test procedure
   if ( ch3 <  ch2 )
      cout << "The character ch3 is less than "
           << "the character ch2." << endl;
   else
      cout << "The character ch3 is not less "
           << "than the character ch2." << endl;
}

需求

標頭：<string>

命名空間: std

請參閱

參考

char_traits 結構