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Improved some of the metaprogramming methods (refs #9046)

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[SVN r85482]
This commit is contained in:
Antony Polukhin
2013-08-27 07:07:15 +00:00
parent 3ce36a2848
commit fac805ddf6
1 changed files with 24 additions and 27 deletions
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51
include/boost/lexical_cast.hpp
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@@ -2133,24 +2133,17 @@ namespace boost {
/* /*
* is_xchar_to_xchar<Target, Source>::value is true, when * is_xchar_to_xchar<Target, Source>::value is true, when
* Target and Souce are the same char types, or when * Target and Souce are the same char types, or when
* Target and Souce are char types of the same size. * Target and Souce are char types of the same size (signed char, unsigned char).
*/ */
template<typename Target, typename Source> template<typename Target, typename Source>
struct is_xchar_to_xchar struct is_xchar_to_xchar
{ {
BOOST_STATIC_CONSTANT(bool, value = BOOST_STATIC_CONSTANT(bool, value =
( (
boost::type_traits::ice_or< boost::type_traits::ice_and<
boost::type_traits::ice_and< boost::type_traits::ice_eq<sizeof(Source), sizeof(Target)>::value,
boost::is_same<Source,Target>::value, boost::detail::is_character<Target>::value,
boost::detail::is_character<Target>::value boost::detail::is_character<Source>::value
>::value,
boost::type_traits::ice_and<
boost::type_traits::ice_eq< sizeof(char),sizeof(Target)>::value,
boost::type_traits::ice_eq< sizeof(char),sizeof(Source)>::value,
boost::detail::is_character<Target>::value,
boost::detail::is_character<Source>::value
>::value
>::value >::value
) )
); );
@@ -2321,6 +2314,7 @@ namespace boost {
{ {
typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_c< typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_c<
boost::type_traits::ice_and< boost::type_traits::ice_and<
boost::is_unsigned<Target>::value,
boost::type_traits::ice_or< boost::type_traits::ice_or<
boost::is_signed<Source>::value, boost::is_signed<Source>::value,
boost::is_float<Source>::value boost::is_float<Source>::value
@@ -2330,8 +2324,7 @@ namespace boost {
>::value, >::value,
boost::type_traits::ice_not< boost::type_traits::ice_not<
boost::is_same<Target, bool>::value boost::is_same<Target, bool>::value
>::value, >::value
boost::is_unsigned<Target>::value
>::value, >::value,
lexical_cast_dynamic_num_ignoring_minus<Target, Source>, lexical_cast_dynamic_num_ignoring_minus<Target, Source>,
lexical_cast_dynamic_num_not_ignoring_minus<Target, Source> lexical_cast_dynamic_num_not_ignoring_minus<Target, Source>
@@ -2348,26 +2341,30 @@ namespace boost {
typedef BOOST_DEDUCED_TYPENAME boost::detail::array_to_pointer_decay<Source>::type src; typedef BOOST_DEDUCED_TYPENAME boost::detail::array_to_pointer_decay<Source>::type src;
typedef BOOST_DEDUCED_TYPENAME boost::type_traits::ice_or< typedef BOOST_DEDUCED_TYPENAME boost::type_traits::ice_or<
boost::detail::is_xchar_to_xchar<Target, src >::value, boost::detail::is_xchar_to_xchar<Target, src >::value,
boost::detail::is_char_array_to_stdstring<Target, src >::value, boost::detail::is_char_array_to_stdstring<Target, src >::value,
boost::type_traits::ice_and< boost::type_traits::ice_and<
boost::is_same<Target, src >::value, boost::is_same<Target, src >::value,
boost::detail::is_stdstring<Target >::value boost::detail::is_stdstring<Target >::value
>::value >::value
> shall_we_copy_t; > shall_we_copy_t;
typedef BOOST_DEDUCED_TYPENAME typedef boost::detail::is_arithmetic_and_not_xchars<Target, src >
boost::detail::is_arithmetic_and_not_xchars<Target, src > shall_we_copy_with_dynamic_check_t; shall_we_copy_with_dynamic_check_t;
// We do evaluate second `if_` lazily to avoid unnecessary instantiations
// of `shall_we_copy_with_dynamic_check_t` and improve compilation times.
typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_c< typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_c<
shall_we_copy_t::value, shall_we_copy_t::value,
boost::detail::lexical_cast_copy<src >, boost::mpl::identity<boost::detail::lexical_cast_copy<src > >,
BOOST_DEDUCED_TYPENAME boost::mpl::if_c< boost::mpl::if_<
shall_we_copy_with_dynamic_check_t::value, shall_we_copy_with_dynamic_check_t,
boost::detail::lexical_cast_dynamic_num<Target, src >, boost::detail::lexical_cast_dynamic_num<Target, src >,
boost::detail::lexical_cast_do_cast<Target, src > boost::detail::lexical_cast_do_cast<Target, src >
>::type >
>::type caster_type; >::type caster_type_lazy;
typedef BOOST_DEDUCED_TYPENAME caster_type_lazy::type caster_type;
return caster_type::lexical_cast_impl(arg); return caster_type::lexical_cast_impl(arg);
} }