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The standard is pretty much silent on what constitutes a valid locale name; only that passing an invalid locale name results in std::runtime_error. What locale names are usable on common windows compilers such as MSVC, MinGW, and ICC?
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An object of class std::locale is an immutable indexed set of immutable facets. Each stream object of the C++ input/output library is associated with an std::locale object and uses its facets for parsing and formatting of all data. In addition, a locale object is associated with each std::basic_regex object.
A locale name is based on the language tagging conventions of IETF BCP 47 ( Windows Vista and later), and is represented by LOCALE_SNAME. Generally, the pattern <language>-<REGION> is used. Here, language is a lowercase ISO 639 language code. The codes from ISO 639-1 are used when available.
Ok, there is a difference between C and C++ locales.
Let's start:
MSVC C++ std::locale and C setlocale
Accepts locale names as "Language[_Country][.Codepage]" for example "English_United States.1251" Otherwise would throws. Note: codepage can't be 65001/UTF-8 and should be consistent with ANSI codepage for this locale (or just omitted)
MSVC C++ std::locale and C setlocale in Vista and 7 should accept locales [Language][-Script][-Country] like "en-US" using ISO-631 language codes and ISO 3166 regions and script names.
I tested it with Visual Studio on Windows 7 - it does not work.
MinGW C++ std::locale accepts "C" and "POSIX" it does not support other locales, actually gcc supports locales only over GNU C library - basically only under Linux.
setlocale is native Windows API call so should support all I mentioned above.
It may support wider range of locales when used with alternative C++ libraries like Apache stdcxx or STL Port.
ICC - I hadn't tested it but it depends on the standard C++ library it uses. For example under Linux it used GCC's libstdc++ so it supports all the locales gcc supports. I don't know what standard C++ library it uses under Windows.
If you want to have "compiler and platform" independent locales support (and actually much better support) take a look on Boost.Locale
Artyom
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