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mdbx++: Добавление buffer_pair<> и buffer_pair_spec<>.

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Леонид Юрьев (Leonid Yuriev) 2023-11-26 12:34:06 +03:00
parent ef69336189
commit e68771df18
1 changed files with 86 additions and 0 deletions
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86
mdbx.h++
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@ -3180,6 +3180,92 @@ struct pair_result : public pair {
}
};
template <typename ALLOCATOR, typename CAPACITY_POLICY>
struct buffer_pair_spec {
using buffer_type = buffer<ALLOCATOR, CAPACITY_POLICY>;
using allocator_type = typename buffer_type::allocator_type;
using allocator_traits = typename buffer_type::allocator_traits;
using reservation_policy = CAPACITY_POLICY;
using stl_pair = ::std::pair<buffer_type, buffer_type>;
buffer_type key, value;
MDBX_CXX20_CONSTEXPR buffer_pair_spec() noexcept = default;
MDBX_CXX20_CONSTEXPR
buffer_pair_spec(const allocator_type &allocator) noexcept
: key(allocator), value(allocator) {}
buffer_pair_spec(const buffer_type &key, const buffer_type &value,
const allocator_type &allocator = allocator_type())
: key(key, allocator), value(value, allocator) {}
buffer_pair_spec(const buffer_type &key, const buffer_type &value,
bool make_reference,
const allocator_type &allocator = allocator_type())
: key(key, make_reference, allocator),
value(value, make_reference, allocator) {}
buffer_pair_spec(const stl_pair &pair,
const allocator_type &allocator = allocator_type())
: buffer_pair_spec(pair.first, pair.second, allocator) {}
buffer_pair_spec(const stl_pair &pair, bool make_reference,
const allocator_type &allocator = allocator_type())
: buffer_pair_spec(pair.first, pair.second, make_reference, allocator) {}
buffer_pair_spec(const slice &key, const slice &value,
const allocator_type &allocator = allocator_type())
: key(key, allocator), value(value, allocator) {}
buffer_pair_spec(const slice &key, const slice &value, bool make_reference,
const allocator_type &allocator = allocator_type())
: key(key, make_reference, allocator),
value(value, make_reference, allocator) {}
buffer_pair_spec(const pair &pair,
const allocator_type &allocator = allocator_type())
: buffer_pair_spec(pair.key, pair.value, allocator) {}
buffer_pair_spec(const pair &pair, bool make_reference,
const allocator_type &allocator = allocator_type())
: buffer_pair_spec(pair.key, pair.value, make_reference, allocator) {}
buffer_pair_spec(const txn &txn, const slice &key, const slice &value,
const allocator_type &allocator = allocator_type())
: key(txn, key, allocator), value(txn, value, allocator) {}
buffer_pair_spec(const txn &txn, const pair &pair,
const allocator_type &allocator = allocator_type())
: buffer_pair_spec(txn, pair.key, pair.value, allocator) {}
buffer_pair_spec(buffer_type &&key, buffer_type &&value) noexcept(
buffer_type::move_assign_alloc::is_nothrow())
: key(::std::move(key)), value(::std::move(value)) {}
buffer_pair_spec(buffer_pair_spec &&pair) noexcept(
buffer_type::move_assign_alloc::is_nothrow())
: buffer_pair_spec(::std::move(pair.key), ::std::move(pair.value)) {}
/// \brief Checks whether data chunk stored inside the buffers both, otherwise
/// at least one of buffers just refers to data located outside.
MDBX_NOTHROW_PURE_FUNCTION MDBX_CXX20_CONSTEXPR bool
is_freestanding() const noexcept {
return key.is_freestanding() && value.is_freestanding();
}
/// \brief Checks whether one of the buffers just refers to data located
/// outside the buffer, rather than stores it.
MDBX_NOTHROW_PURE_FUNCTION MDBX_CXX20_CONSTEXPR bool
is_reference() const noexcept {
return key.is_reference() || value.is_reference();
}
/// \brief Makes buffers owning the data.
/// \details If buffer refers to an external data, then makes it the owner
/// of clone by allocating storage and copying the data.
void make_freestanding() {
key.make_freestanding();
value.make_freestanding();
}
operator pair() const noexcept { return pair(key, value); }
};
template <typename BUFFER>
using buffer_pair = buffer_pair_spec<typename BUFFER::allocator_type,
typename BUFFER::reservation_policy>;
/// end of cxx_data @}
//------------------------------------------------------------------------------