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Minor refactoring in allocator access

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This commit is contained in:
Glen Fernandes
2021-12-06 15:58:48 -05:00
parent febc195093
commit 6b3fb219cc
1 changed files with 42 additions and 39 deletions
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81
include/boost/core/allocator_access.hpp
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@ -47,7 +47,7 @@ namespace detail {
template<class A, class = void>
struct alloc_ptr {
typedef typename A::value_type* type;
typedef typename allocator_value_type<A>::type* type;
};
template<class>
@ -98,10 +98,46 @@ struct allocator_const_pointer {
};
#endif
#if defined(BOOST_NO_CXX11_ALLOCATOR)
template<class A, class T>
struct allocator_rebind {
typedef typename A::template rebind<T>::other type;
};
#else
namespace detail {
template<class, class>
struct alloc_to { };
template<template<class, class...> class A, class T, class U, class... V>
struct alloc_to<A<U, V...>, T> {
typedef A<T, V...> type;
};
template<class A, class T, class = void>
struct alloc_rebind {
typedef typename alloc_to<A, T>::type type;
};
template<class A, class T>
struct alloc_rebind<A, T,
typename alloc_void<typename A::template rebind<T>::other>::type> {
typedef typename A::template rebind<T>::other type;
};
} /* detail */
template<class A, class T>
struct allocator_rebind {
typedef typename detail::alloc_rebind<A, T>::type type;
};
#endif
#if defined(BOOST_NO_CXX11_ALLOCATOR)
template<class A>
struct allocator_void_pointer {
typedef typename A::template rebind<void>::other::pointer type;
typedef typename allocator_pointer<typename allocator_rebind<A,
void>::type>::type type;
};
#else
namespace detail {
@ -130,7 +166,8 @@ struct allocator_void_pointer {
#if defined(BOOST_NO_CXX11_ALLOCATOR)
template<class A>
struct allocator_const_void_pointer {
typedef typename A::template rebind<void>::other::const_pointer type;
typedef typename allocator_const_pointer<typename allocator_rebind<A,
void>::type>::type type;
};
#else
namespace detail {
@ -330,41 +367,6 @@ struct allocator_is_always_equal {
};
#endif
#if defined(BOOST_NO_CXX11_ALLOCATOR)
template<class A, class T>
struct allocator_rebind {
typedef typename A::template rebind<T>::other type;
};
#else
namespace detail {
template<class, class>
struct alloc_to { };
template<template<class, class...> class A, class T, class U, class... V>
struct alloc_to<A<U, V...>, T> {
typedef A<T, V...> type;
};
template<class A, class T, class = void>
struct alloc_rebind {
typedef typename alloc_to<A, T>::type type;
};
template<class A, class T>
struct alloc_rebind<A, T,
typename alloc_void<typename A::template rebind<T>::other>::type> {
typedef typename A::template rebind<T>::other type;
};
} /* detail */
template<class A, class T>
struct allocator_rebind {
typedef typename detail::alloc_rebind<A, T>::type type;
};
#endif
template<class A>
inline typename allocator_pointer<A>::type
allocator_allocate(A& a, typename allocator_size_type<A>::type n)
@ -587,7 +589,8 @@ inline typename std::enable_if<!detail::alloc_has_max_size<A>::value,
allocator_max_size(const A&) BOOST_NOEXCEPT
{
return (std::numeric_limits<typename
allocator_size_type<A>::type>::max)() / sizeof(typename A::value_type);
allocator_size_type<A>::type>::max)() /
sizeof(typename allocator_value_type<A>::type);
}
#endif