string.clear()

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string.clear()

分类： 关于C++ 2010-01-23 13:55 1236人阅读 评论(0) 收藏 举报

     今天看了一段的代码。发现好多的东西平时都没有用过。

我们来看看这个吧，是string中的一些函数。它存在C++ library内.

<string>被包含进来，在其中的Classes内的Member Functions中basic_string::clear

就是它了。

basic_string::clear

          Erases all elements of a string.

void clear( );

备注（remarks）：The string on which the member function is called will be empty.

相关的例子如下（不是我写的哦~）：

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

int main( )
{
   using namespace std;
   string  str1 ("Hello world"), str2;
   basic_string <char>::iterator str_Iter;
   cout << "The original string str1 is: ";
   for ( str_Iter = str1.begin( ); str_Iter != str1.end( ); str_Iter++ )
      cout << *str_Iter;
   cout << endl;

   str1.clear ( );
   cout << "The modified string str1 is: ";
   for ( str_Iter = str1.begin( ); str_Iter != str1.end( ); str_Iter++ )
      cout << *str_Iter;
   cout << endl;

   //For an empty string, begin is equivalent to end
   if ( str1.begin ( ) == str1.end ( ) )
      cout << "Nothing printed above because "
           << "the string str1 is empty." << endl;
   else
      cout << "The string str1 is not empty." << endl;
}

结果呢（output）：

The original string str1 is: Hello world
The modified string str1 is: 
Nothing printed above because the string str1 is empty.

应该看得懂了吧~