32 #include <type_traits> 40 #define ELECTRONEUM_FIELD(obj, field) \ 41 obj , decltype(std::declval<obj>().field) , offsetof(obj, field) 44 #define ELECTRONEUM_SORT_BY(obj, field) \ 46 lmdb::native_type<decltype(std::declval<obj>().field)>, \ 47 offsetof(obj, field) \ 51 #define ELECTRONEUM_COMPARE(obj, field) \ 53 decltype(std::declval<obj>().field), \ 54 offsetof(obj, field) \ 80 template<typename T, typename U = typename std::underlying_type<T>::type>
91 static_assert(!std::is_rvalue_reference<T&&>(),
"cannot use temporary value");
92 void const*
const temp =
reinterpret_cast<void const*
>(std::addressof(
value));
110 template<
typename T, std::
size_t offset = 0>
113 if (!left || !right || left->mv_size <
sizeof(
T) + offset || right->mv_size <
sizeof(
T) + offset)
115 assert(
"invalid use of custom comparison" == 0);
121 std::memcpy(std::addressof(left_val), static_cast<char*>(left->mv_data) + offset,
sizeof(
T));
122 std::memcpy(std::addressof(right_val), static_cast<char*>(right->mv_data) + offset,
sizeof(
T));
123 return left_val < right_val ? -1 :
bool(right_val < left_val);
134 template<
typename T, std::
size_t offset = 0>
137 static_assert(!epee::has_padding<T>(),
"memcmp will not work");
138 if (!left || !right || left->mv_size <
sizeof(
T) + offset || right->mv_size <
sizeof(
T) + offset)
140 assert(
"invalid use of custom comparison" == 0);
144 static_cast<char*>(left->mv_data) + offset,
145 static_cast<char*>(right->mv_data) + offset,
Lightning memory-mapped database library.
int compare(MDB_val const *left, MDB_val const *right) noexcept
int less(MDB_val const *left, MDB_val const *right) noexcept
Generic structure used for passing keys and data in and out of the database.
Prevent instantiation of std::underlying_type<T> when T is not enum.
const GenericPointer< typename T::ValueType > T2 value
void * memcpy(void *a, const void *b, size_t c)
MDB_val to_val(T &&value) noexcept
constexpr U to_native(T value) noexcept
typename std::conditional< std::is_enum< T >::value, std::underlying_type< T >, identity< T > >::type::type native_type
constexpr epee::span< const std::uint8_t > to_byte_span(MDB_val value) noexcept