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ircd::db: Create template for integer comparators.

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This commit is contained in:
Jason Volk 2018-04-17 13:42:30 -07:00
parent ad0f248b0f
commit 12957038f7
1 changed files with 42 additions and 12 deletions
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54
include/ircd/db/comparator.h
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@ -15,9 +15,15 @@ namespace ircd::db
{
struct comparator;
template<class T> struct cmp_integer;
template<class T> struct reverse_cmp_integer;
struct cmp_int64_t;
struct reverse_cmp_int64_t;
struct cmp_uint64_t;
struct reverse_cmp_uint64_t;
struct cmp_string_view;
struct reverse_cmp_string_view;
}
@ -74,42 +80,66 @@ struct ircd::db::reverse_cmp_string_view
{}
};
struct ircd::db::cmp_int64_t
template<class T>
struct ircd::db::cmp_integer
:db::comparator
{
static bool less(const string_view &sa, const string_view &sb)
{
assert(sa.size() == sizeof(int64_t) && sb.size() == sizeof(int64_t));
const byte_view<int64_t> a{sa}, b{sb};
const byte_view<T> a{sa}, b{sb};
return a < b;
}
static bool equal(const string_view &sa, const string_view &sb)
{
assert(sa.size() == sizeof(int64_t) && sb.size() == sizeof(int64_t));
const byte_view<int64_t> a{sa}, b{sb};
const byte_view<T> a{sa}, b{sb};
return a == b;
}
cmp_int64_t()
:db::comparator{"int64_t", &less, &equal}
cmp_integer()
:db::comparator{"integer", &less, &equal}
{}
};
struct ircd::db::reverse_cmp_int64_t
template<class T>
struct ircd::db::reverse_cmp_integer
:db::comparator
{
static bool less(const string_view &a, const string_view &b)
{
return !cmp_int64_t::less(a, b);
return !cmp_integer<T>::less(a, b);
}
static bool equal(const string_view &a, const string_view &b)
{
return cmp_int64_t::equal(a, b);
return cmp_integer<T>::equal(a, b);
}
reverse_cmp_int64_t()
:db::comparator{"reverse_int64_t", &less, &equal}
reverse_cmp_integer()
:db::comparator{"reverse_integer", &less, &equal}
{}
};
struct ircd::db::cmp_int64_t
:cmp_integer<int64_t>
{
using cmp_integer<int64_t>::cmp_integer;
};
struct ircd::db::reverse_cmp_int64_t
:reverse_cmp_integer<int64_t>
{
using reverse_cmp_integer<int64_t>::reverse_cmp_integer;
};
struct ircd::db::cmp_uint64_t
:cmp_integer<uint64_t>
{
using cmp_integer<uint64_t>::cmp_integer;
};
struct ircd::db::reverse_cmp_uint64_t
:reverse_cmp_integer<uint64_t>
{
using reverse_cmp_integer<uint64_t>::reverse_cmp_integer;
};