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Fix [ 1358600 ] lexical_cast & pure virtual functions & VC 8 STL

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[SVN r36739]
This commit is contained in:
Alexander Nasonov
2007-01-16 21:53:27 +00:00
parent 2c41ed0473
commit 986ec16ecc
1 changed files with 29 additions and 0 deletions
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29
include/boost/detail/lcast_precision.hpp
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@@ -15,6 +15,10 @@
#include <boost/config.hpp>
#include <boost/integer_traits.hpp>
#if BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1400)) // VC++ 8.0
#include <boost/type_traits/is_abstract.hpp>
#endif
#ifdef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS
#include <boost/assert.hpp>
#else
@@ -23,6 +27,27 @@
namespace boost { namespace detail {
#if BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1400))
template<class T, bool IsAbstract> struct lcast_msvc_limits;
template<class T>
struct lcast_msvc_limits<T,false>
: std::numeric_limits<T>
{
};
// Non-abstract class that does define a specialization of numeric_limits:
class lcast_msvc_without_limits {};
template<class T>
struct lcast_msvc_limits<T,true>
: std::numeric_limits<lcast_msvc_without_limits>
{
};
#endif // VC++ workaround
#ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS
// Calculate an argument to pass to std::ios_base::precision from
// lexical_cast. See alternative implementation for broken standard
@@ -30,7 +55,11 @@ namespace boost { namespace detail {
template<class T>
struct lcast_precision
{
#if BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1400))
typedef lcast_msvc_limits<T, (boost::is_abstract<T>::value)> limits;
#else
typedef std::numeric_limits<T> limits;
#endif
BOOST_STATIC_CONSTANT(bool, use_default_precision =
!limits::is_specialized || limits::is_exact