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Date: Thu, 09 Feb 2012 12:13:36 +0100
From: marco atzeri <marco DOT atzeri AT gmail DOT com>
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To: cygwin AT cygwin DOT com
Subject: how to set locale with C++
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Attached a small example taken from Bruce Eckel Thinking in C++

On cygwin both this call

   cout.imbue(locale("en_US.UTF-8"));

   cout.imbue(locale("fr_FR.UTF-8"));

raise exception

"terminate called after throwing an instance of 'std::runtime_error'
   what():  locale::facet::_S_create_c_locale name not valid
Aborted (core dumped)"

I could understand eventually the second one, but "English (US)" is the 
current windows locale so I expected that at least "en_US.UTF-8" is 
accepted.

What I am missing ?

Regards
Marco

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 filename="Locale.cpp"

//: C04:Locale.cpp {-g++}{-bor}{-edg} {RunByHand}
// Illustrates effects of locales.
#include <iostream>
#include <locale>
using namespace std;
 
int main() {
  locale def;
  cout << def.name() << endl;
  locale current = cout.getloc();
  cout << current.name() << endl;
  float val = 1234.56;
  cout << val << endl;

  // Change to US
  cout.imbue(locale("en_US.UTF-8"));
  current = cout.getloc();
  cout << current.name() << endl;
  cout << val << endl;

  // Change to French/France
  cout.imbue(locale("fr_FR.UTF-8"));
  current = cout.getloc();
  cout << current.name() << endl;
  cout << val << endl;

 
  cout << "Enter the literal 7890,12: ";
  cin.imbue(cout.getloc());
  cin >> val;
  cout << val << endl;
  cout.imbue(def);
  cout << val << endl;
} ///:~



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