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Handle enum types.

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** Aleksey, I have some doubts about whether this will cause problems
   on the various compilers we work on.  I also wonder whether it
   implies that our arithmetic ops all need to be changed.**


[SVN r17132]
This commit is contained in:
Dave Abrahams
2003-01-31 19:39:56 +00:00
parent f2569333ce
commit 82f1cf3786
1 changed files with 9 additions and 6 deletions
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15
include/boost/mpl/integral_c.hpp
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@@ -37,24 +37,27 @@ struct integral_c
typedef integral_c type; typedef integral_c type;
typedef T value_type; typedef T value_type;
// Note that the static_casts below are there to handle the case
// where T is an enum type.
// have to #ifdef here: some compilers don't like the 'N + 1' form (MSVC), // have to #ifdef here: some compilers don't like the 'N + 1' form (MSVC),
// while some other don't like 'value + 1' (Borland), and some don't like // while some other don't like 'value + 1' (Borland), and some don't like
// either // either
#if defined(__EDG_VERSION__) && __EDG_VERSION__ <= 243 #if defined(__EDG_VERSION__) && __EDG_VERSION__ <= 243
private: private:
BOOST_STATIC_CONSTANT(T, next_value = (N + 1)); BOOST_STATIC_CONSTANT(T, next_value = static_cast<T>(N + 1));
BOOST_STATIC_CONSTANT(T, prior_value = (N - 1)); BOOST_STATIC_CONSTANT(T, prior_value = static_cast<T>(N - 1));
public: public:
typedef integral_c<T, next_value> next; typedef integral_c<T, next_value> next;
typedef integral_c<T, prior_value> prior; typedef integral_c<T, prior_value> prior;
#elif BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x561)) \ #elif BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x561)) \
|| BOOST_WORKAROUND(__IBMCPP__, BOOST_TESTED_AT(502)) \ || BOOST_WORKAROUND(__IBMCPP__, BOOST_TESTED_AT(502)) \
|| BOOST_WORKAROUND(__HP_aCC, BOOST_TESTED_AT(53800)) || BOOST_WORKAROUND(__HP_aCC, BOOST_TESTED_AT(53800))
typedef integral_c<T, (N + 1)> next; typedef integral_c<T, static_cast<T>(N + 1)> next;
typedef integral_c<T, (N - 1)> prior; typedef integral_c<T, static_cast<T>(N - 1)> prior;
#else #else
typedef integral_c<T, (value + 1)> next; typedef integral_c<T, static_cast<T>(value + 1)> next;
typedef integral_c<T, (value - 1)> prior; typedef integral_c<T, static_cast<T>(value - 1)> prior;
#endif #endif
// enables uniform function call syntax for families of overloaded // enables uniform function call syntax for families of overloaded