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mdbx++: добавление slice::as_pod<typename>().

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Леонид Юрьев (Leonid Yuriev)
2023-10-06 12:06:22 +03:00
parent bc6d320bb2
commit c256e8358c
2 changed files with 151 additions and 0 deletions
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44
mdbx.h++
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@@ -394,6 +394,16 @@ using path = ::std::wstring;
using path = ::std::string;
#endif /* mdbx::path */
#if defined(__SIZEOF_INT128__) || \
(defined(_INTEGRAL_MAX_BITS) && _INTEGRAL_MAX_BITS >= 128)
#ifndef MDBX_U128_TYPE
#define MDBX_U128_TYPE __uint128_t
#endif /* MDBX_U128_TYPE */
#ifndef MDBX_I128_TYPE
#define MDBX_I128_TYPE __int128_t
#endif /* MDBX_I128_TYPE */
#endif /* __SIZEOF_INT128__ || _INTEGRAL_MAX_BITS >= 128 */
#if __cplusplus >= 201103L || defined(DOXYGEN)
/// \brief Duration in 1/65536 units of second.
using duration = ::std::chrono::duration<unsigned, ::std::ratio<1, 65536>>;
@@ -552,6 +562,7 @@ MDBX_DECLARE_EXCEPTION(transaction_overlapping);
[[noreturn]] LIBMDBX_API void throw_max_length_exceeded();
[[noreturn]] LIBMDBX_API void throw_out_range();
[[noreturn]] LIBMDBX_API void throw_allocators_mismatch();
[[noreturn]] LIBMDBX_API void throw_bad_value_size();
static MDBX_CXX14_CONSTEXPR size_t check_length(size_t bytes);
static MDBX_CXX14_CONSTEXPR size_t check_length(size_t headroom,
size_t payload);
@@ -1029,6 +1040,35 @@ struct LIBMDBX_API_TYPE slice : public ::MDBX_val {
return slice(size_t(-1));
}
template <typename POD> MDBX_CXX14_CONSTEXPR POD as_pod() const {
static_assert(::std::is_standard_layout<POD>::value &&
!::std::is_pointer<POD>::value,
"Must be a standard layout type!");
if (MDBX_LIKELY(size() == sizeof(POD)))
MDBX_CXX20_LIKELY {
POD r;
memcpy(&r, data(), sizeof(r));
return r;
}
throw_bad_value_size();
}
#ifdef MDBX_U128_TYPE
MDBX_U128_TYPE as_uint128() const;
#endif /* MDBX_U128_TYPE */
uint64_t as_uint64() const;
uint32_t as_uint32() const;
uint16_t as_uint16() const;
uint8_t as_uint8() const;
#ifdef MDBX_I128_TYPE
MDBX_I128_TYPE as_int128() const;
#endif /* MDBX_I128_TYPE */
int64_t as_int64() const;
int32_t as_int32() const;
int16_t as_int16() const;
int8_t as_int8() const;
protected:
MDBX_CXX11_CONSTEXPR slice(size_t invalid_length) noexcept
: ::MDBX_val({nullptr, invalid_length}) {}
@@ -2292,6 +2332,10 @@ public:
return buffer(::mdbx::slice::wrap(pod), make_reference, allocator);
}
template <typename POD> MDBX_CXX14_CONSTEXPR POD as_pod() const {
return slice_.as_pod<POD>();
}
/// \brief Reserves storage space.
void reserve(size_t wanna_headroom, size_t wanna_tailroom) {
wanna_headroom = ::std::min(::std::max(headroom(), wanna_headroom),