util.h File Reference

#include <cstddef>
#include <cstring>
#include <lmdb.h>
#include <type_traits>
#include <utility>
#include "span.h"

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Classes
struct	lmdb::identity< T >
	Prevent instantiation of std::underlying_type<T> when T is not enum. More...

Namespaces
	lmdb

Macros
#define	ELECTRONEUM_FIELD(obj, field)    obj , decltype(std::declval<obj>().field) , offsetof(obj, field)
#define	ELECTRONEUM_SORT_BY(obj, field)
	Expands to lmdb::less for the value field within obj. More...
#define	ELECTRONEUM_COMPARE(obj, field)
	Expands to lmdb::compare for the value field within obj. More...

Typedefs
template<typename T >
using	lmdb::native_type = typename std::conditional< std::is_enum< T >::value, std::underlying_type< T >, identity< T > >::type::type

Functions
template<typename T , typename U = typename std::underlying_type<T>::type>
constexpr U	lmdb::to_native (T value) noexcept
template<typename T >
MDB_val	lmdb::to_val (T &&value) noexcept
constexpr epee::span< const std::uint8_t >	lmdb::to_byte_span (MDB_val value) noexcept
template<typename T , std::size_t offset = 0>
int	lmdb::less (MDB_val const *left, MDB_val const *right) noexcept
template<typename T , std::size_t offset = 0>
int	lmdb::compare (MDB_val const *left, MDB_val const *right) noexcept

Macro Definition Documentation

ELECTRONEUM_COMPARE

#define ELECTRONEUM_COMPARE	(		obj,
			field
	)

Value:

    &::lmdb::compare<                        \
        decltype(std::declval<obj>().field), \
        offsetof(obj, field)                 \
    >

Expands to lmdb::compare for the value field within obj.

ELECTRONEUM_FIELD

#define ELECTRONEUM_FIELD	(		obj,
			field
	)		obj , decltype(std::declval<obj>().field) , offsetof(obj, field)

Calculates types and offset of struct field. Use in template arguments for table::get_value, value_iterator::get_value, value_stream::make_iterator, or value_stream::make_range.

ELECTRONEUM_SORT_BY

#define ELECTRONEUM_SORT_BY	(		obj,
			field
	)

Value:

    &::lmdb::less<                                              \
        lmdb::native_type<decltype(std::declval<obj>().field)>, \
        offsetof(obj, field)                                    \
    >

Expands to lmdb::less for the value field within obj.