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Added add_cv definition

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[SVN r13121]
This commit is contained in:
John Maddock
2002-03-07 12:06:44 +00:00
parent 79417d9a29
commit 4fe73d6f02
1 changed files with 21 additions and 0 deletions
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21
include/boost/type_traits/cv_traits.hpp
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@@ -283,11 +283,32 @@ struct add_volatile
# pragma warning(pop)
#endif
};
// * convert a type T to a const volatile type - add_cv<T>
// this is not required since the result is always
// the same as "T const volatile", but it does suppress warnings
// from some compilers:
template <typename T>
struct add_cv
{
#if defined(BOOST_MSVC) && BOOST_MSVC <= 1200
// This bogus warning will appear when add_volatile is applied to a
// const volatile reference because we can't detect const volatile
// references with MSVC6.
# pragma warning(push)
# pragma warning(disable:4181) // warning C4181: qualifier applied to reference type ignored
#endif
typedef T const volatile type;
#if defined(BOOST_MSVC) && BOOST_MSVC <= 1200
# pragma warning(pop)
#endif
};
#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
template <class T>
struct add_const<T&>{ typedef T& type; };
template <class T>
struct add_volatile<T&>{ typedef T& type; };
template <class T>
struct add_cv<T&>{ typedef T& type; };
#endif
} // namespace boost