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merge MSVC-specific & no CTPS cases (the former was still ICE-ing sometimes)

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[SVN r20928]
This commit is contained in:
Aleksey Gurtovoy
2003-11-23 21:33:45 +00:00
parent 75bc9954e4
commit efb20a69be
1 changed files with 7 additions and 47 deletions
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54
include/boost/mpl/if.hpp
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@@ -80,48 +80,6 @@ struct if_
BOOST_MPL_AUX_LAMBDA_SUPPORT(3,if_,(C,T1,T2))
};
#elif defined(BOOST_MSVC) && (BOOST_MSVC <= 1300)
// MSVC6.5-specific version
template<
bool C_
, typename T1
, typename T2
>
struct if_c
{
private:
template<bool> struct answer { typedef T1 type; };
template<> struct answer<false> { typedef T2 type; };
public:
typedef typename answer< C_ >::type type;
};
// (almost) copy & paste in order to save one more
// recursively nested template instantiation to user
template<
typename C_
, typename T1
, typename T2
>
struct if_
{
private:
template<bool> struct answer { typedef T1 type; };
template<> struct answer<false> { typedef T2 type; };
// agurt, 17/sep/02: in some situations MSVC 7.0 doesn't
// handle 'answer<C::value>' expression very well
enum { c_ = C_::value };
public:
typedef typename answer< BOOST_MPL_AUX_STATIC_CAST(bool, c_) >::type type;
BOOST_MPL_AUX_LAMBDA_SUPPORT(3,if_,(C_,T1,T2))
};
#else
// no partial class template specialization
@@ -149,29 +107,31 @@ struct if_impl<false>
} // namespace aux
template<
bool C
bool C_
, typename T1
, typename T2
>
struct if_c
{
typedef typename aux::if_impl< C >
typedef typename aux::if_impl< C_ >
::template result_<T1,T2>::type type;
};
// (almost) copy & paste in order to save one more
// recursively nested template instantiation to user
template<
typename BOOST_MPL_AUX_VOID_SPEC_PARAM(C)
typename BOOST_MPL_AUX_VOID_SPEC_PARAM(C_)
, typename BOOST_MPL_AUX_VOID_SPEC_PARAM(T1)
, typename BOOST_MPL_AUX_VOID_SPEC_PARAM(T2)
>
struct if_
{
typedef typename aux::if_impl< BOOST_MPL_AUX_STATIC_CAST(bool, C::value) >
enum { msvc70_wknd_ = C_::value };
typedef typename aux::if_impl< BOOST_MPL_AUX_STATIC_CAST(bool, msvc70_wknd_) >
::template result_<T1,T2>::type type;
BOOST_MPL_AUX_LAMBDA_SUPPORT(3,if_,(C,T1,T2))
BOOST_MPL_AUX_LAMBDA_SUPPORT(3,if_,(C_,T1,T2))
};
#endif // BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION