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Updated INF/NAN support for char16_t and char32_t

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[SVN r77058]
This commit is contained in:
Antony Polukhin
2012-02-17 18:51:05 +00:00
parent 80e858b182
commit d9baa71302
1 changed files with 55 additions and 62 deletions
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117
include/boost/lexical_cast.hpp
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@ -799,6 +799,41 @@ namespace boost
return false;
}
template <class CharT, class T>
bool put_inf_nan_impl(CharT* begin, CharT*& end, const T& value
, const CharT* lc_nan
, const CharT* lc_infinity)
{
using namespace std;
const CharT minus = lcast_char_constants<CharT>::minus;
if ( (boost::math::isnan)(value) )
{
if ( (boost::math::signbit)(value) )
{
*begin = minus;
++ begin;
}
memcpy(begin, lc_nan, 3 * sizeof(CharT));
end = begin + 3;
return true;
} else if ( (boost::math::isinf)(value) )
{
if ( (boost::math::signbit)(value) )
{
*begin = minus;
++ begin;
}
memcpy(begin, lc_infinity, 3 * sizeof(CharT));
end = begin + 3;
return true;
}
return false;
}
#ifndef BOOST_LCAST_NO_WCHAR_T
template <class T>
bool parse_inf_nan(const wchar_t* begin, const wchar_t* end, T& value)
@ -808,6 +843,13 @@ namespace boost
, L"INFINITY", L"infinity"
, L'(', L')');
}
template <class T>
bool put_inf_nan(wchar_t* begin, wchar_t*& end, const T& value)
{
return put_inf_nan_impl(begin, end, value, L"nan", L"infinity");
}
#endif
#ifndef BOOST_NO_CHAR16_T
template <class T>
@ -818,6 +860,12 @@ namespace boost
, u"INFINITY", u"infinity"
, u'(', u')');
}
template <class T>
bool put_inf_nan(char16_t* begin, char16_t*& end, const T& value)
{
return put_inf_nan_impl(begin, end, value, u"nan", u"infinity");
}
#endif
#ifndef BOOST_NO_CHAR32_T
template <class T>
@ -828,6 +876,12 @@ namespace boost
, U"INFINITY", U"infinity"
, U'(', U')');
}
template <class T>
bool put_inf_nan(char32_t* begin, char32_t*& end, const T& value)
{
return put_inf_nan_impl(begin, end, value, U"nan", U"infinity");
}
#endif
template <class CharT, class T>
@ -838,73 +892,12 @@ namespace boost
, "INFINITY", "infinity"
, '(', ')');
}
#ifndef BOOST_LCAST_NO_WCHAR_T
template <class T>
bool put_inf_nan(wchar_t* begin, wchar_t*& end, const T& value)
{
using namespace std;
if ( (boost::math::isnan)(value) )
{
if ( (boost::math::signbit)(value) )
{
memcpy(begin,L"-nan", sizeof(L"-nan"));
end = begin + 4;
} else
{
memcpy(begin,L"nan", sizeof(L"nan"));
end = begin + 3;
}
return true;
} else if ( (boost::math::isinf)(value) )
{
if ( (boost::math::signbit)(value) )
{
memcpy(begin,L"-inf", sizeof(L"-inf"));
end = begin + 4;
} else
{
memcpy(begin,L"inf", sizeof(L"inf"));
end = begin + 3;
}
return true;
}
return false;
}
#endif
template <class CharT, class T>
bool put_inf_nan(CharT* begin, CharT*& end, const T& value)
{
using namespace std;
if ( (boost::math::isnan)(value) )
{
if ( (boost::math::signbit)(value) )
{
memcpy(begin,"-nan", sizeof("-nan"));
end = begin + 4;
} else
{
memcpy(begin,"nan", sizeof("nan"));
end = begin + 3;
}
return true;
} else if ( (boost::math::isinf)(value) )
{
if ( (boost::math::signbit)(value) )
{
memcpy(begin,"-inf", sizeof("-inf"));
end = begin + 4;
} else
{
memcpy(begin,"inf", sizeof("inf"));
end = begin + 3;
}
return true;
}
return false;
return put_inf_nan_impl(begin, end, value, "nan", "infinity");
}
}