libs/format/example/sample_new_features.cpp

   1 // ----------------------------------------------------------------------------
   2 // sample_new_features.cpp : demonstrate features added to printf's syntax
   3 // ----------------------------------------------------------------------------
   4
   5 //  Copyright Samuel Krempp 2003. Use, modification, and distribution are
   6 //  subject to the Boost Software License, Version 1.0. (See accompanying
   7 //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   8
   9 //  See http://www.boost.org/libs/format for library home page
  10
  11 // ----------------------------------------------------------------------------
  12
  13 #include <iostream>
  14 #include <iomanip>
  15
  16 #include "boost/format.hpp"
  17
  18 int main(){
  19     using namespace std;
  20     using boost::format;
  21     using boost::io::group;
  22
  23     // ------------------------------------------------------------------------
  24     // Simple style of reordering :
  25     cout << format("%1% %2% %3% %2% %1% \n") % "o" % "oo" % "O";
  26     //          prints  "o oo O oo o \n"
  27
  28
  29     // ------------------------------------------------------------------------
  30     // Centered alignment : flag '='
  31     cout << format("_%|=6|_") % 1 << endl;
  32     //          prints "_   1  _"  :  3 spaces are  padded before, and 2 after.
  33
  34
  35
  36     // ------------------------------------------------------------------------
  37     // Tabulations :   "%|Nt|"  => tabulation of N spaces.
  38     //                 "%|NTf|" => tabulation of N times the character <f>.
  39     //  are useful when printing lines with several fields whose width can vary a lot
  40     //    but we'd like to print some fields at the same place when possible :
  41     vector<string>  names(1, "Marc-François Michel"),
  42       surname(1,"Durand"),
  43       tel(1, "+33 (0) 123 456 789");
  44
  45     names.push_back("Jean");
  46     surname.push_back("de Lattre de Tassigny");
  47     tel.push_back("+33 (0) 987 654 321");
  48
  49     for(unsigned int i=0; i<names.size(); ++i)
  50       cout << format("%1%, %2%, %|40t|%3%\n") % names[i] % surname[i] % tel[i];
  51
  52     /* prints :
  53
  54
  55     Marc-François Michel, Durand,       +33 (0) 123 456 789
  56     Jean, de Lattre de Tassigny,        +33 (0) 987 654 321
  57
  58
  59      the same using width on each field lead to unnecessary too long lines,
  60      while 'Tabulations' insure a lower bound on the *sum* of widths,
  61      and that's often what we really want.
  62     */
  63
  64
  65
  66     cerr << "\n\nEverything went OK, exiting. \n";
  67     return 0;
  68 }