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glm/test/external/boost/xpressive/traits/cpp_regex_traits.hpp

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///////////////////////////////////////////////////////////////////////////////
/// \file cpp_regex_traits.hpp
/// Contains the definition of the cpp_regex_traits\<\> template, which is a
/// wrapper for std::locale that can be used to customize the behavior of
/// static and dynamic regexes.
//
// Copyright 2008 Eric Niebler. Distributed under the Boost
// Software License, Version 1.0. (See accompanying file
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#ifndef BOOST_XPRESSIVE_TRAITS_CPP_REGEX_TRAITS_HPP_EAN_10_04_2005
#define BOOST_XPRESSIVE_TRAITS_CPP_REGEX_TRAITS_HPP_EAN_10_04_2005
// MS compatible compilers support #pragma once
#if defined(_MSC_VER) && (_MSC_VER >= 1020)
# pragma once
#endif
#include <ios>
#include <string>
#include <locale>
#include <sstream>
#include <boost/config.hpp>
#include <boost/assert.hpp>
#include <boost/integer.hpp>
#include <boost/mpl/assert.hpp>
#include <boost/detail/workaround.hpp>
#include <boost/type_traits/is_same.hpp>
#include <boost/xpressive/detail/detail_fwd.hpp>
#include <boost/xpressive/detail/utility/literals.hpp>
// From John Maddock:
// Fix for gcc prior to 3.4: std::ctype<wchar_t> doesn't allow masks to be combined, for example:
// std::use_facet<std::ctype<wchar_t> >(locale()).is(std::ctype_base::lower|std::ctype_base::upper, L'a');
// incorrectly returns false.
// NOTE: later version of the gcc define __GLIBCXX__, not __GLIBCPP__
#if BOOST_WORKAROUND(__GLIBCPP__, != 0)
# define BOOST_XPRESSIVE_BUGGY_CTYPE_FACET
#endif
namespace boost { namespace xpressive
{
namespace detail
{
// define an unsigned integral typedef of the same size as std::ctype_base::mask
typedef boost::uint_t<sizeof(std::ctype_base::mask) * CHAR_BIT>::least umask_t;
BOOST_MPL_ASSERT_RELATION(sizeof(std::ctype_base::mask), ==, sizeof(umask_t));
// Calculate what the size of the umaskex_t type should be to fix the 3 extra bitmasks
// 11 char categories in ctype_base
// + 3 extra categories for xpressive
// = 14 total bits needed
int const umaskex_bits = (14 > (sizeof(umask_t) * CHAR_BIT)) ? 14 : sizeof(umask_t) * CHAR_BIT;
// define an unsigned integral type with at least umaskex_bits
typedef boost::uint_t<umaskex_bits>::fast umaskex_t;
BOOST_MPL_ASSERT_RELATION(sizeof(umask_t), <=, sizeof(umaskex_t));
// cast a ctype mask to a umaskex_t
template<std::ctype_base::mask Mask>
struct mask_cast
{
BOOST_STATIC_CONSTANT(umaskex_t, value = static_cast<umask_t>(Mask));
};
#ifdef __CYGWIN__
// Work around a gcc warning on cygwin
template<>
struct mask_cast<std::ctype_base::print>
{
BOOST_MPL_ASSERT_RELATION('\227', ==, std::ctype_base::print);
BOOST_STATIC_CONSTANT(umaskex_t, value = 0227);
};
#endif
#ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION
template<std::ctype_base::mask Mask>
umaskex_t const mask_cast<Mask>::value;
#endif
#ifndef BOOST_XPRESSIVE_BUGGY_CTYPE_FACET
// an unsigned integer with the highest bit set
umaskex_t const highest_bit = static_cast<umaskex_t>(1) << (sizeof(umaskex_t) * CHAR_BIT - 1);
///////////////////////////////////////////////////////////////////////////////
// unused_mask
// find a bit in an int that isn't set
template<umaskex_t In, umaskex_t Out = highest_bit, bool Done = (0 == (Out & In))>
struct unused_mask
{
BOOST_MPL_ASSERT_RELATION(1, !=, Out);
BOOST_STATIC_CONSTANT(umaskex_t, value = (unused_mask<In, (Out >> 1)>::value));
};
template<umaskex_t In, umaskex_t Out>
struct unused_mask<In, Out, true>
{
BOOST_STATIC_CONSTANT(umaskex_t, value = Out);
};
#ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION
template<umaskex_t In, umaskex_t Out, bool Done>
umaskex_t const unused_mask<In, Out, Done>::value;
#endif
umaskex_t const std_ctype_alnum = mask_cast<std::ctype_base::alnum>::value;
umaskex_t const std_ctype_alpha = mask_cast<std::ctype_base::alpha>::value;
umaskex_t const std_ctype_cntrl = mask_cast<std::ctype_base::cntrl>::value;
umaskex_t const std_ctype_digit = mask_cast<std::ctype_base::digit>::value;
umaskex_t const std_ctype_graph = mask_cast<std::ctype_base::graph>::value;
umaskex_t const std_ctype_lower = mask_cast<std::ctype_base::lower>::value;
umaskex_t const std_ctype_print = mask_cast<std::ctype_base::print>::value;
umaskex_t const std_ctype_punct = mask_cast<std::ctype_base::punct>::value;
umaskex_t const std_ctype_space = mask_cast<std::ctype_base::space>::value;
umaskex_t const std_ctype_upper = mask_cast<std::ctype_base::upper>::value;
umaskex_t const std_ctype_xdigit = mask_cast<std::ctype_base::xdigit>::value;
// Reserve some bits for the implementation
#if defined(__GLIBCXX__)
umaskex_t const std_ctype_reserved = 0x8000;
#elif defined(_CPPLIB_VER) && defined(BOOST_WINDOWS)
umaskex_t const std_ctype_reserved = 0x8200;
#else
umaskex_t const std_ctype_reserved = 0;
#endif
// Bitwise-or all the ctype masks together
umaskex_t const all_ctype_masks = std_ctype_reserved
| std_ctype_alnum | std_ctype_alpha | std_ctype_cntrl | std_ctype_digit
| std_ctype_graph | std_ctype_lower | std_ctype_print | std_ctype_punct
| std_ctype_space | std_ctype_upper | std_ctype_xdigit;
// define a new mask for "underscore" ("word" == alnum | underscore)
umaskex_t const non_std_ctype_underscore = unused_mask<all_ctype_masks>::value;
// define a new mask for "blank"
umaskex_t const non_std_ctype_blank = unused_mask<all_ctype_masks | non_std_ctype_underscore>::value;
// define a new mask for "newline"
umaskex_t const non_std_ctype_newline = unused_mask<all_ctype_masks | non_std_ctype_underscore | non_std_ctype_blank>::value;
#else
///////////////////////////////////////////////////////////////////////////////
// Ugly work-around for buggy ctype facets.
umaskex_t const std_ctype_alnum = 1 << 0;
umaskex_t const std_ctype_alpha = 1 << 1;
umaskex_t const std_ctype_cntrl = 1 << 2;
umaskex_t const std_ctype_digit = 1 << 3;
umaskex_t const std_ctype_graph = 1 << 4;
umaskex_t const std_ctype_lower = 1 << 5;
umaskex_t const std_ctype_print = 1 << 6;
umaskex_t const std_ctype_punct = 1 << 7;
umaskex_t const std_ctype_space = 1 << 8;
umaskex_t const std_ctype_upper = 1 << 9;
umaskex_t const std_ctype_xdigit = 1 << 10;
umaskex_t const non_std_ctype_underscore = 1 << 11;
umaskex_t const non_std_ctype_blank = 1 << 12;
umaskex_t const non_std_ctype_newline = 1 << 13;
static umaskex_t const std_masks[] =
{
mask_cast<std::ctype_base::alnum>::value
, mask_cast<std::ctype_base::alpha>::value
, mask_cast<std::ctype_base::cntrl>::value
, mask_cast<std::ctype_base::digit>::value
, mask_cast<std::ctype_base::graph>::value
, mask_cast<std::ctype_base::lower>::value
, mask_cast<std::ctype_base::print>::value
, mask_cast<std::ctype_base::punct>::value
, mask_cast<std::ctype_base::space>::value
, mask_cast<std::ctype_base::upper>::value
, mask_cast<std::ctype_base::xdigit>::value
};
inline int mylog2(umaskex_t i)
{
return "\0\0\1\0\2\0\0\0\3"[i & 0xf]
+ "\0\4\5\0\6\0\0\0\7"[(i & 0xf0) >> 04]
+ "\0\10\11\0\12\0\0\0\13"[(i & 0xf00) >> 010];
}
#endif
// convenient constant for the extra masks
umaskex_t const non_std_ctype_masks = non_std_ctype_underscore | non_std_ctype_blank | non_std_ctype_newline;
///////////////////////////////////////////////////////////////////////////////
// cpp_regex_traits_base
// BUGBUG this should be replaced with a regex facet that lets you query for
// an array of underscore characters and an array of line separator characters.
template<typename Char, std::size_t SizeOfChar = sizeof(Char)>
struct cpp_regex_traits_base
{
protected:
void imbue(std::locale const &)
{
}
static bool is(std::ctype<Char> const &ct, Char ch, umaskex_t mask)
{
#ifndef BOOST_XPRESSIVE_BUGGY_CTYPE_FACET
if(ct.is((std::ctype_base::mask)(umask_t)mask, ch))
{
return true;
}
#else
umaskex_t tmp = mask & ~non_std_ctype_masks;
for(umaskex_t i; 0 != (i = (tmp & (~tmp+1))); tmp &= ~i)
{
std::ctype_base::mask m = (std::ctype_base::mask)(umask_t)std_masks[mylog2(i)];
if(ct.is(m, ch))
{
return true;
}
}
#endif
return ((mask & non_std_ctype_blank) && cpp_regex_traits_base::is_blank(ch))
|| ((mask & non_std_ctype_underscore) && cpp_regex_traits_base::is_underscore(ch))
|| ((mask & non_std_ctype_newline) && cpp_regex_traits_base::is_newline(ch));
}
private:
static bool is_blank(Char ch)
{
BOOST_MPL_ASSERT_RELATION('\t', ==, L'\t');
BOOST_MPL_ASSERT_RELATION(' ', ==, L' ');
return L' ' == ch || L'\t' == ch;
}
static bool is_underscore(Char ch)
{
BOOST_MPL_ASSERT_RELATION('_', ==, L'_');
return L'_' == ch;
}
static bool is_newline(Char ch)
{
BOOST_MPL_ASSERT_RELATION('\r', ==, L'\r');
BOOST_MPL_ASSERT_RELATION('\n', ==, L'\n');
BOOST_MPL_ASSERT_RELATION('\f', ==, L'\f');
return L'\r' == ch || L'\n' == ch || L'\f' == ch
|| (1 < SizeOfChar && (0x2028u == ch || 0x2029u == ch || 0x85u == ch));
}
};
#ifndef BOOST_XPRESSIVE_BUGGY_CTYPE_FACET
template<typename Char>
struct cpp_regex_traits_base<Char, 1>
{
protected:
void imbue(std::locale const &loc)
{
int i = 0;
Char allchars[UCHAR_MAX + 1];
for(i = 0; i <= static_cast<int>(UCHAR_MAX); ++i)
{
allchars[i] = static_cast<Char>(i);
}
std::ctype<Char> const &ct = BOOST_USE_FACET(std::ctype<Char>, loc);
std::ctype_base::mask tmp[UCHAR_MAX + 1];
ct.is(allchars, allchars + UCHAR_MAX + 1, tmp);
for(i = 0; i <= static_cast<int>(UCHAR_MAX); ++i)
{
this->masks_[i] = static_cast<umask_t>(tmp[i]);
BOOST_ASSERT(0 == (this->masks_[i] & non_std_ctype_masks));
}
this->masks_[static_cast<unsigned char>('_')] |= non_std_ctype_underscore;
this->masks_[static_cast<unsigned char>(' ')] |= non_std_ctype_blank;
this->masks_[static_cast<unsigned char>('\t')] |= non_std_ctype_blank;
this->masks_[static_cast<unsigned char>('\n')] |= non_std_ctype_newline;
this->masks_[static_cast<unsigned char>('\r')] |= non_std_ctype_newline;
this->masks_[static_cast<unsigned char>('\f')] |= non_std_ctype_newline;
}
bool is(std::ctype<Char> const &, Char ch, umaskex_t mask) const
{
return 0 != (this->masks_[static_cast<unsigned char>(ch)] & mask);
}
private:
umaskex_t masks_[UCHAR_MAX + 1];
};
#endif
} // namespace detail
///////////////////////////////////////////////////////////////////////////////
// cpp_regex_traits
//
/// \brief Encapsaulates a std::locale for use by the
/// basic_regex\<\> class template.
template<typename Char>
struct cpp_regex_traits
: detail::cpp_regex_traits_base<Char>
{
typedef Char char_type;
typedef std::basic_string<char_type> string_type;
typedef std::locale locale_type;
typedef detail::umaskex_t char_class_type;
typedef regex_traits_version_2_tag version_tag;
typedef detail::cpp_regex_traits_base<Char> base_type;
/// Initialize a cpp_regex_traits object to use the specified std::locale,
/// or the global std::locale if none is specified.
///
cpp_regex_traits(locale_type const &loc = locale_type())
: base_type()
, loc_()
{
this->imbue(loc);
}
/// Checks two cpp_regex_traits objects for equality
///
/// \return this->getloc() == that.getloc().
bool operator ==(cpp_regex_traits<char_type> const &that) const
{
return this->loc_ == that.loc_;
}
/// Checks two cpp_regex_traits objects for inequality
///
/// \return this->getloc() != that.getloc().
bool operator !=(cpp_regex_traits<char_type> const &that) const
{
return this->loc_ != that.loc_;
}
/// Convert a char to a Char
///
/// \param ch The source character.
/// \return std::use_facet\<std::ctype\<char_type\> \>(this->getloc()).widen(ch).
char_type widen(char ch) const
{
return this->ctype_->widen(ch);
}
/// Returns a hash value for a Char in the range [0, UCHAR_MAX]
///
/// \param ch The source character.
/// \return a value between 0 and UCHAR_MAX, inclusive.
static unsigned char hash(char_type ch)
{
return static_cast<unsigned char>(std::char_traits<Char>::to_int_type(ch));
}
/// No-op
///
/// \param ch The source character.
/// \return ch
static char_type translate(char_type ch)
{
return ch;
}
/// Converts a character to lower-case using the internally-stored std::locale.
///
/// \param ch The source character.
/// \return std::tolower(ch, this->getloc()).
char_type translate_nocase(char_type ch) const
{
return this->ctype_->tolower(ch);
}
/// Converts a character to lower-case using the internally-stored std::locale.
///
/// \param ch The source character.
/// \return std::tolower(ch, this->getloc()).
char_type tolower(char_type ch) const
{
return this->ctype_->tolower(ch);
}
/// Converts a character to upper-case using the internally-stored std::locale.
///
/// \param ch The source character.
/// \return std::toupper(ch, this->getloc()).
char_type toupper(char_type ch) const
{
return this->ctype_->toupper(ch);
}
/// Returns a string_type containing all the characters that compare equal
/// disregrarding case to the one passed in. This function can only be called
/// if has_fold_case\<cpp_regex_traits\<Char\> \>::value is true.
///
/// \param ch The source character.
/// \return string_type containing all chars which are equal to ch when disregarding
/// case
string_type fold_case(char_type ch) const
{
BOOST_MPL_ASSERT((is_same<char_type, char>));
char_type ntcs[] = {
this->ctype_->tolower(ch)
, this->ctype_->toupper(ch)
, 0
};
if(ntcs[1] == ntcs[0])
ntcs[1] = 0;
return string_type(ntcs);
}
/// Checks to see if a character is within a character range.
///
/// \param first The bottom of the range, inclusive.
/// \param last The top of the range, inclusive.
/// \param ch The source character.
/// \return first <= ch && ch <= last.
static bool in_range(char_type first, char_type last, char_type ch)
{
return first <= ch && ch <= last;
}
/// Checks to see if a character is within a character range, irregardless of case.
///
/// \param first The bottom of the range, inclusive.
/// \param last The top of the range, inclusive.
/// \param ch The source character.
/// \return in_range(first, last, ch) || in_range(first, last, tolower(ch, this->getloc())) ||
/// in_range(first, last, toupper(ch, this->getloc()))
/// \attention The default implementation doesn't do proper Unicode
/// case folding, but this is the best we can do with the standard
/// ctype facet.
bool in_range_nocase(char_type first, char_type last, char_type ch) const
{
// NOTE: this default implementation doesn't do proper Unicode
// case folding, but this is the best we can do with the standard
// std::ctype facet.
return this->in_range(first, last, ch)
|| this->in_range(first, last, this->ctype_->toupper(ch))
|| this->in_range(first, last, this->ctype_->tolower(ch));
}
/// INTERNAL ONLY
//string_type transform(char_type const *begin, char_type const *end) const
//{
// return this->collate_->transform(begin, end);
//}
/// Returns a sort key for the character sequence designated by the iterator range [F1, F2)
/// such that if the character sequence [G1, G2) sorts before the character sequence [H1, H2)
/// then v.transform(G1, G2) \< v.transform(H1, H2).
///
/// \attention Not currently used
template<typename FwdIter>
string_type transform(FwdIter begin, FwdIter end) const
{
//string_type str(begin, end);
//return this->transform(str.data(), str.data() + str.size());
BOOST_ASSERT(false);
return string_type();
}
/// Returns a sort key for the character sequence designated by the iterator range [F1, F2)
/// such that if the character sequence [G1, G2) sorts before the character sequence [H1, H2)
/// when character case is not considered then
/// v.transform_primary(G1, G2) \< v.transform_primary(H1, H2).
///
/// \attention Not currently used
template<typename FwdIter>
string_type transform_primary(FwdIter begin, FwdIter end) const
{
BOOST_ASSERT(false); // TODO implement me
return string_type();
}
/// Returns a sequence of characters that represents the collating element
/// consisting of the character sequence designated by the iterator range [F1, F2).
/// Returns an empty string if the character sequence is not a valid collating element.
///
/// \attention Not currently used
template<typename FwdIter>
string_type lookup_collatename(FwdIter begin, FwdIter end) const
{
BOOST_ASSERT(false); // TODO implement me
return string_type();
}
/// For the character class name represented by the specified character sequence,
/// return the corresponding bitmask representation.
///
/// \param begin A forward iterator to the start of the character sequence representing
/// the name of the character class.
/// \param end The end of the character sequence.
/// \param icase Specifies whether the returned bitmask should represent the case-insensitive
/// version of the character class.
/// \return A bitmask representing the character class.
template<typename FwdIter>
char_class_type lookup_classname(FwdIter begin, FwdIter end, bool icase) const
{
static detail::umaskex_t const icase_masks =
detail::std_ctype_lower | detail::std_ctype_upper;
BOOST_ASSERT(begin != end);
char_class_type char_class = this->lookup_classname_impl_(begin, end);
if(0 == char_class)
{
// convert the string to lowercase
string_type classname(begin, end);
for(typename string_type::size_type i = 0, len = classname.size(); i < len; ++i)
{
classname[i] = this->translate_nocase(classname[i]);
}
char_class = this->lookup_classname_impl_(classname.begin(), classname.end());
}
// erase case-sensitivity if icase==true
if(icase && 0 != (char_class & icase_masks))
{
char_class |= icase_masks;
}
return char_class;
}
/// Tests a character against a character class bitmask.
///
/// \param ch The character to test.
/// \param mask The character class bitmask against which to test.
/// \pre mask is a bitmask returned by lookup_classname, or is several such masks bit-or'ed
/// together.
/// \return true if the character is a member of any of the specified character classes, false
/// otherwise.
bool isctype(char_type ch, char_class_type mask) const
{
return this->base_type::is(*this->ctype_, ch, mask);
}
/// Convert a digit character into the integer it represents.
///
/// \param ch The digit character.
/// \param radix The radix to use for the conversion.
/// \pre radix is one of 8, 10, or 16.
/// \return -1 if ch is not a digit character, the integer value of the character otherwise.
/// The conversion is performed by imbueing a std::stringstream with this-\>getloc();
/// setting the radix to one of oct, hex or dec; inserting ch into the stream; and
/// extracting an int.
int value(char_type ch, int radix) const
{
BOOST_ASSERT(8 == radix || 10 == radix || 16 == radix);
int val = -1;
std::basic_stringstream<char_type> str;
str.imbue(this->getloc());
str << (8 == radix ? std::oct : (16 == radix ? std::hex : std::dec));
str.put(ch);
str >> val;
return str.fail() ? -1 : val;
}
/// Imbues *this with loc
///
/// \param loc A std::locale.
/// \return the previous std::locale used by *this.
locale_type imbue(locale_type loc)
{
locale_type old_loc = this->loc_;
this->loc_ = loc;
this->ctype_ = &BOOST_USE_FACET(std::ctype<char_type>, this->loc_);
//this->collate_ = &BOOST_USE_FACET(std::collate<char_type>, this->loc_);
this->base_type::imbue(this->loc_);
return old_loc;
}
/// Returns the current std::locale used by *this.
///
locale_type getloc() const
{
return this->loc_;
}
private:
///////////////////////////////////////////////////////////////////////////////
// char_class_pair
/// INTERNAL ONLY
struct char_class_pair
{
char_type const *class_name_;
char_class_type class_type_;
};
///////////////////////////////////////////////////////////////////////////////
// char_class
/// INTERNAL ONLY
static char_class_pair const &char_class(std::size_t j)
{
static char_class_pair const s_char_class_map[] =
{
{ BOOST_XPR_CSTR_(char_type, "alnum"), detail::std_ctype_alnum }
, { BOOST_XPR_CSTR_(char_type, "alpha"), detail::std_ctype_alpha }
, { BOOST_XPR_CSTR_(char_type, "blank"), detail::non_std_ctype_blank }
, { BOOST_XPR_CSTR_(char_type, "cntrl"), detail::std_ctype_cntrl }
, { BOOST_XPR_CSTR_(char_type, "d"), detail::std_ctype_digit }
, { BOOST_XPR_CSTR_(char_type, "digit"), detail::std_ctype_digit }
, { BOOST_XPR_CSTR_(char_type, "graph"), detail::std_ctype_graph }
, { BOOST_XPR_CSTR_(char_type, "lower"), detail::std_ctype_lower }
, { BOOST_XPR_CSTR_(char_type, "newline"),detail::non_std_ctype_newline }
, { BOOST_XPR_CSTR_(char_type, "print"), detail::std_ctype_print }
, { BOOST_XPR_CSTR_(char_type, "punct"), detail::std_ctype_punct }
, { BOOST_XPR_CSTR_(char_type, "s"), detail::std_ctype_space }
, { BOOST_XPR_CSTR_(char_type, "space"), detail::std_ctype_space }
, { BOOST_XPR_CSTR_(char_type, "upper"), detail::std_ctype_upper }
, { BOOST_XPR_CSTR_(char_type, "w"), detail::std_ctype_alnum | detail::non_std_ctype_underscore }
, { BOOST_XPR_CSTR_(char_type, "xdigit"), detail::std_ctype_xdigit }
, { 0, 0 }
};
return s_char_class_map[j];
}
///////////////////////////////////////////////////////////////////////////////
// lookup_classname_impl
/// INTERNAL ONLY
template<typename FwdIter>
static char_class_type lookup_classname_impl_(FwdIter begin, FwdIter end)
{
// find the classname
typedef cpp_regex_traits<Char> this_t;
for(std::size_t j = 0; 0 != this_t::char_class(j).class_name_; ++j)
{
if(this_t::compare_(this_t::char_class(j).class_name_, begin, end))
{
return this_t::char_class(j).class_type_;
}
}
return 0;
}
/// INTERNAL ONLY
template<typename FwdIter>
static bool compare_(char_type const *name, FwdIter begin, FwdIter end)
{
for(; *name && begin != end; ++name, ++begin)
{
if(*name != *begin)
{
return false;
}
}
return !*name && begin == end;
}
locale_type loc_;
std::ctype<char_type> const *ctype_;
//std::collate<char_type> const *collate_;
};
///////////////////////////////////////////////////////////////////////////////
// cpp_regex_traits<>::hash specializations
template<>
inline unsigned char cpp_regex_traits<unsigned char>::hash(unsigned char ch)
{
return ch;
}
template<>
inline unsigned char cpp_regex_traits<char>::hash(char ch)
{
return static_cast<unsigned char>(ch);
}
template<>
inline unsigned char cpp_regex_traits<signed char>::hash(signed char ch)
{
return static_cast<unsigned char>(ch);
}
#ifndef BOOST_XPRESSIVE_NO_WREGEX
template<>
inline unsigned char cpp_regex_traits<wchar_t>::hash(wchar_t ch)
{
return static_cast<unsigned char>(ch);
}
#endif
// Narrow C++ traits has fold_case() member function.
template<>
struct has_fold_case<cpp_regex_traits<char> >
: mpl::true_
{
};
}}
#endif