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has_xxx checkin

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[SVN r16307]
This commit is contained in:
Aleksey Gurtovoy
2002-11-18 07:31:13 +00:00
parent 0985fa8dd4
commit d591921930
1 changed files with 34 additions and 30 deletions
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64
include/boost/mpl/aux_/has_xxx.hpp
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@@ -32,22 +32,22 @@
// the implementation below is based on a USENET newsgroup's posting by
// Rani Sharoni (comp.lang.c++.moderated, 2002-03-17 07:45:09 PST)
# define BOOST_MPL_HAS_XXX_TRAIT_DEF(name) \
# define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(trait, name) \
template< typename T > \
boost::mpl::aux::yes_tag \
has_##name##_helper( \
trait##_helper( \
T const volatile* \
, boost::mpl::aux::type_wrapper<BOOST_MSVC_TYPENAME T::name>* = 0 \
); \
\
boost::mpl::aux::no_tag \
has_##name##_helper(...); \
trait##_helper(...); \
\
template< typename T > \
struct has_##name \
struct trait \
{ \
BOOST_STATIC_CONSTANT(bool, value = \
sizeof((has_##name##_helper)(static_cast<T*>(0))) \
sizeof((trait##_helper)(static_cast<T*>(0))) \
== sizeof(boost::mpl::aux::yes_tag) \
); \
}; \
@@ -66,9 +66,9 @@ namespace boost { namespace mpl { namespace aux {
struct has_xxx_tag;
}}}
# define BOOST_MPL_HAS_XXX_TRAIT_DEF_(name) \
# define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF_(trait, name) \
template< typename T, typename name = ::boost::mpl::aux::has_xxx_tag > \
struct has_##name : T \
struct trait : T \
{ \
private: \
static boost::mpl::aux::no_tag test(void(*)(::boost::mpl::aux::has_xxx_tag)); \
@@ -81,37 +81,37 @@ struct has_##name : T \
); \
}; \
\
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(name, void) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(name, bool) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(name, char) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(name, signed char) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(name, unsigned char) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(name, signed short) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(name, unsigned short) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(name, signed int) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(name, unsigned int) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(name, signed long) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(name, unsigned long) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(name, float) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(name, double) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(name, long double) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, void) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, bool) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, char) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, signed char) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, unsigned char) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, signed short) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, unsigned short) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, signed int) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, unsigned int) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, signed long) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, unsigned long) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, float) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, double) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, long double) \
/**/
# define BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(name, T) \
template<> struct has_##name<T,boost::mpl::aux::has_xxx_tag> \
# define BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, T) \
template<> struct trait<T,boost::mpl::aux::has_xxx_tag> \
{ \
enum { value = false }; \
}; \
/**/
#if !defined(BOOST_NO_INTRINSIC_WCHAR_T)
# define BOOST_MPL_HAS_XXX_TRAIT_DEF(name) \
BOOST_MPL_HAS_XXX_TRAIT_DEF_(name) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(name, wchar_t) \
# define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(trait, name) \
BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF_(trait, name) \
BOOST_MPL_AUX_HAS_XXX_TRAIT_SPEC(trait, wchar_t) \
/**/
#else
# define BOOST_MPL_HAS_XXX_TRAIT_DEF(name) \
BOOST_MPL_HAS_XXX_TRAIT_DEF_(name) \
# define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(trait, name) \
BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF_(trait, name) \
/**/
#endif
@@ -119,9 +119,9 @@ template<> struct has_##name<T,boost::mpl::aux::has_xxx_tag> \
#else
# define BOOST_MPL_HAS_XXX_TRAIT_DEF(name) \
# define BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(trait, name) \
template< typename T > \
struct has_##name \
struct trait \
{ \
BOOST_STATIC_CONSTANT(bool, value = false); \
}; \
@@ -129,4 +129,8 @@ struct has_##name \
#endif // BOOST_MPL_BROKEN_OVERLOAD_RESOLUTION
#define BOOST_MPL_HAS_XXX_TRAIT_DEF(name) \
BOOST_MPL_HAS_XXX_TRAIT_NAMED_DEF(has_##name, name) \
/**/
#endif // BOOST_MPL_AUX_HAS_XXX_HPP_INCLUDED