ostreambuf_iterator::failed

测试失败的插入到输出流缓冲区。

bool failed( ) const throw( );

返回值

true,如果插入到输出流缓冲区中没有失败之前;否则 false

备注

如果为,则在指向成员 **operator=**的任何前面使用,为 subf_->sputc 的调用返回 eof,成员函数返回 true

示例

// ostreambuf_iterator_failed.cpp
// compile with: /EHsc
#include <iterator>
#include <vector>
#include <iostream>

int main( )
{
   using namespace std;

   // ostreambuf_iterator for stream cout
   ostreambuf_iterator<char> charOut ( cout );
   
   *charOut = 'a';
   charOut ++;
   *charOut  = 'b';
   charOut ++;   
   *charOut = 'c';
   cout << " are characters output individually." << endl;

   bool b1 = charOut.failed ( );
   if (b1) 
       cout << "At least one insertion failed." << endl;
   else
       cout << "No insertions failed." << endl;
}
  
  

要求

标头: <iterator>

命名空间: std

请参见

参考

ostreambuf_iterator Class

标准模板库