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Use same style of detection in pointer_traits and allocator_traits

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This commit is contained in:
Glen Fernandes 2021-12-15 15:30:42 -05:00
parent a2b37091eb
commit 02b3f91fc3
3 changed files with 28 additions and 30 deletions
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54
include/boost/core/allocator_access.hpp
View File

@ -386,22 +386,24 @@ allocator_allocate(A& a, typename allocator_size_type<A>::type n,
#else
namespace detail {
struct alloc_none { };
template<class>
struct alloc_no {
char x, y;
};
template<class A>
class alloc_has_allocate {
template<class O>
static auto check(int)
-> decltype(std::declval<O&>().allocate(std::declval<typename
-> alloc_no<decltype(std::declval<O&>().allocate(std::declval<typename
boost::allocator_size_type<A>::type>(), std::declval<typename
boost::allocator_const_void_pointer<A>::type>()));
boost::allocator_const_void_pointer<A>::type>()))>;
template<class>
static alloc_none check(long);
static char check(long);
public:
BOOST_STATIC_CONSTEXPR bool value =
!std::is_same<decltype(check<A>(0)), alloc_none>::value;
BOOST_STATIC_CONSTEXPR bool value = sizeof(check<A>(0)) > 1;
};
} /* detail */
@ -471,15 +473,14 @@ template<class A, class T, class... Args>
class alloc_has_construct {
template<class O>
static auto check(int)
-> decltype(std::declval<O&>().construct(std::declval<T*>(),
std::declval<Args&&>()...));
-> alloc_no<decltype(std::declval<O&>().construct(std::declval<T*>(),
std::declval<Args&&>()...))>;
template<class>
static alloc_none check(long);
static char check(long);
public:
BOOST_STATIC_CONSTEXPR bool value =
!std::is_same<decltype(check<A>(0)), alloc_none>::value;
BOOST_STATIC_CONSTEXPR bool value = sizeof(check<A>(0)) > 1;
};
} /* detail */
@ -516,14 +517,13 @@ template<class A, class T>
class alloc_has_destroy {
template<class O>
static auto check(int)
-> decltype(std::declval<O&>().destroy(std::declval<T*>()));
-> alloc_no<decltype(std::declval<O&>().destroy(std::declval<T*>()))>;
template<class>
static alloc_none check(long);
static char check(long);
public:
BOOST_STATIC_CONSTEXPR bool value =
!std::is_same<decltype(check<A>(0)), alloc_none>::value;
BOOST_STATIC_CONSTEXPR bool value = sizeof(check<A>(0)) > 1;
};
} /* detail */
@ -549,8 +549,7 @@ namespace detail {
#if defined(BOOST_NO_CXX11_ALLOCATOR)
template<class T, T>
struct alloc_no {
char x;
char y;
char x, y;
};
template<class A>
@ -571,20 +570,20 @@ class alloc_has_max_size {
static char check(long);
public:
BOOST_STATIC_CONSTEXPR bool value = sizeof(check<A>(0)) != 1;
BOOST_STATIC_CONSTEXPR bool value = sizeof(check<A>(0)) > 1;
};
#else
template<class A>
class alloc_has_max_size {
template<class O>
static auto check(int) -> decltype(std::declval<const O&>().max_size());
static auto check(int)
-> alloc_no<decltype(std::declval<const O&>().max_size())>;
template<class>
static alloc_none check(long);
static char check(long);
public:
BOOST_STATIC_CONSTEXPR bool value =
!std::is_same<decltype(check<A>(0)), alloc_none>::value;
BOOST_STATIC_CONSTEXPR bool value = sizeof(check<A>(0)) > 1;
};
#endif
@ -637,21 +636,20 @@ class alloc_has_soccc {
static char check(long);
public:
BOOST_STATIC_CONSTEXPR bool value = sizeof(check<A>(0)) != 1;
BOOST_STATIC_CONSTEXPR bool value = sizeof(check<A>(0)) > 1;
};
#else
template<class A>
class alloc_has_soccc {
template<class O>
static auto check(int) -> decltype(std::declval<const
O&>().select_on_container_copy_construction());
static auto check(int) -> alloc_no<decltype(std::declval<const
O&>().select_on_container_copy_construction())>;
template<class>
static alloc_none check(long);
static char check(long);
public:
BOOST_STATIC_CONSTEXPR bool value =
!std::is_same<decltype(check<A>(0)), alloc_none>::value;
BOOST_STATIC_CONSTEXPR bool value = sizeof(check<A>(0)) > 1;
};
#endif

2
include/boost/core/pointer_traits.hpp
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@ -123,7 +123,7 @@ class ptr_to_expr {
static char check(long);
public:
BOOST_STATIC_CONSTEXPR bool value = sizeof(check<T>(0)) != 1;
BOOST_STATIC_CONSTEXPR bool value = sizeof(check<T>(0)) > 1;
};
template<class T, class E>

2
test/pointer_traits_pointer_to_sfinae_test.cpp
View File

@ -24,7 +24,7 @@ class has_pointer_to {
static char check(long);
public:
static const bool value = sizeof(check<T>(0)) != 1;
static const bool value = sizeof(check<T>(0)) > 1;
};
struct P1 { };