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Improve ptr_traits_has_rebind trait

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This commit is contained in:
Glen Fernandes
2017-05-18 20:09:52 -04:00
parent 6fd649d7fd
commit 2d56d6f55b
1 changed files with 3 additions and 3 deletions
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6
include/boost/core/pointer_traits.hpp
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@ -131,13 +131,13 @@ struct ptr_traits_difference<T, false> {
typedef std::ptrdiff_t type; typedef std::ptrdiff_t type;
}; };
template<class T> template<class T, class V>
struct ptr_traits_has_rebind { struct ptr_traits_has_rebind {
private: private:
template<class U> template<class U>
static ptr_traits_none call(...); static ptr_traits_none call(...);
template<class U> template<class U>
static char call(typename U::template rebind<U>* = 0); static char call(typename U::template rebind<V>* = 0);
public: public:
BOOST_STATIC_CONSTEXPR bool value = sizeof(call<T>(0)) == 1; BOOST_STATIC_CONSTEXPR bool value = sizeof(call<T>(0)) == 1;
}; };
@ -169,7 +169,7 @@ struct ptr_traits_rebind_to<T<U1, U2, U3>, V> {
#endif #endif
#if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES) #if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
template<class T, class U, bool = ptr_traits_has_rebind<T>::value> template<class T, class U, bool = ptr_traits_has_rebind<T, U>::value>
struct ptr_traits_rebind { struct ptr_traits_rebind {
typedef typename T::template rebind<U> type; typedef typename T::template rebind<U> type;
}; };