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Fix for type-punning warnings from gcc.

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See: https://svn.boost.org/trac10/ticket/13479
This commit is contained in:
jzmaddock
2018-03-29 11:31:35 +01:00
parent e34ad30482
commit 4c3706113a
1 changed files with 5 additions and 15 deletions
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20
include/boost/type_traits/integral_constant.hpp
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@ -56,17 +56,12 @@ namespace boost{
typedef T value_type;
typedef integral_constant<T, val> type;
static const T value = val;
//
// This helper function is just to disable type-punning
// warnings from GCC:
//
template <class U>
static U& dereference(U* p) { return *p; }
operator const mpl::integral_c<T, val>& ()const
{
static const char data[sizeof(long)] = { 0 };
return dereference(reinterpret_cast<const mpl::integral_c<T, val>*>(&data));
static const void* pdata = data;
return *(reinterpret_cast<const mpl::integral_c<T, val>*>(pdata));
}
BOOST_CONSTEXPR operator T()const { return val; }
};
@ -81,17 +76,12 @@ namespace boost{
typedef bool value_type;
typedef integral_constant<bool, val> type;
static const bool value = val;
//
// This helper function is just to disable type-punning
// warnings from GCC:
//
template <class T>
static T& dereference(T* p) { return *p; }
operator const mpl::bool_<val>& ()const
{
static const char data = 0;
return dereference(reinterpret_cast<const mpl::bool_<val>*>(&data));
static const char data[sizeof(long)] = { 0 };
static const void* pdata = data;
return *(reinterpret_cast<const mpl::bool_<val>*>(pdata));
}
BOOST_CONSTEXPR operator bool()const { return val; }
};