fig20_26.cpp

来自「这是C＋＋编程经典的书上实例的源代码。 （英文名是《C＋＋ how to pr」· C++ 代码 · 共 62 行

// Fig. 20.26: fig20_26.cpp
// Demonstrating fill, fill_n, generate, and generate_n
// Standard Library methods. 
#include <iostream>

using std::cout;
using std::endl;

#include <algorithm>
#include <vector>

char nextLetter();

int main()
{
   std::vector< char > chars( 10 );
   std::ostream_iterator< char > output( cout, " " );

   std::fill( chars.begin(), chars.end(), '5' );
   cout << "Vector chars after filling with 5s:\n";
   std::copy( chars.begin(), chars.end(), output );

   std::fill_n( chars.begin(), 5, 'A' );
   cout << "\nVector chars after filling five elements"
        << " with As:\n";
   std::copy( chars.begin(), chars.end(), output );

   std::generate( chars.begin(), chars.end(), nextLetter );
   cout << "\nVector chars after generating letters A-J:\n";
   std::copy( chars.begin(), chars.end(), output );

   std::generate_n( chars.begin(), 5, nextLetter );
   cout << "\nVector chars after generating K-O for the"
        << " first five elements:\n";
   std::copy( chars.begin(), chars.end(), output );

   cout << endl;
   return 0;
}

char nextLetter()
{
   static char letter = 'A';
   return letter++;
}


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