ceph/src/boost/libs/lexical_cast/example/small_examples.cpp

   1 // Copyright 2013 Antony Polukhin
   2
   3 // Distributed under the Boost Software License, Version 1.0.
   4 // (See the accompanying file LICENSE_1_0.txt
   5 // or a copy at <http://www.boost.org/LICENSE_1_0.txt>.)
   6
   7 #include <boost/lexical_cast.hpp>
   8 #include <string>
   9 #include <cstdio>
  10
  11 //[lexical_cast_log_errno
  12 //`The following example uses numeric data in a string expression:
  13
  14 void log_message(const std::string &);
  15
  16 void log_errno(int yoko)
  17 {
  18     log_message("Error " + boost::lexical_cast<std::string>(yoko) + ": " + strerror(yoko));
  19 }
  20
  21 //] [/lexical_cast_log_errno]
  22
  23
  24 //[lexical_cast_fixed_buffer
  25 //`The following example converts some number and puts it to file:
  26
  27 void number_to_file(int number, FILE* file)
  28 {
  29     typedef boost::array<char, 50> buf_t; // You can use std::array if your compiler supports it
  30     buf_t buffer = boost::lexical_cast<buf_t>(number); // No dynamic memory allocation
  31     std::fputs(buffer.begin(), file);
  32 }
  33
  34 //] [/lexical_cast_fixed_buffer]
  35
  36 //[lexical_cast_substring_conversion
  37 //`The following example takes part of the string and converts it to `int`:
  38
  39 int convert_strings_part(const std::string& s, std::size_t pos, std::size_t n)
  40 {
  41     return boost::lexical_cast<int>(s.data() + pos, n);
  42 }
  43
  44 //] [/lexical_cast_substring_conversion]
  45
  46 void log_message(const std::string &) {}
  47
  48 int main()
  49 {
  50     return 0;
  51 }
  52