fill1.cpp

来自「C#一个实例源代码」· C++ 代码 · 共 49 行

/* The following code example is taken from the book
 * "The C++ Standard Library - A Tutorial and Reference"
 * by Nicolai M. Josuttis, Addison-Wesley, 1999
 *
 * (C) Copyright Nicolai M. Josuttis 1999.
 * Permission to copy, use, modify, sell and distribute this software
 * is granted provided this copyright notice appears in all copies.
 * This software is provided "as is" without express or implied
 * warranty, and with no claim as to its suitability for any purpose.
 */
#include "algostuff.hpp"
using namespace std;

int main()
{
    // print ten times 7.7
    fill_n(ostream_iterator<float>(cout, " "), // beginning of destination
           10,                                 // count
           7.7);                               // new value
    cout << endl;

    list<string> coll;

    // insert "hello" nine times
    fill_n(back_inserter(coll),       // beginning of destination
           9,                         // count
           "hello");                  // new value
    PRINT_ELEMENTS(coll,"coll: ");

    // overwrite all elements with "again"
    fill(coll.begin(), coll.end(),    // destination
         "again");                    // new value
    PRINT_ELEMENTS(coll,"coll: ");

    // replace all but two elements with "hi"
    fill_n(coll.begin(),              // beginning of destination
           coll.size()-2,             // count
           "hi");                     // new value
    PRINT_ELEMENTS(coll,"coll: ");

    // replace the second and up to the last element but one with "hmmm"
    list<string>::iterator pos1, pos2;
    pos1 = coll.begin();
    pos2 = coll.end();
    fill (++pos1, --pos2,              // destination
          "hmmm");                     // new value
    PRINT_ELEMENTS(coll,"coll: ");
}