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mdbx++: добавление поддержки std::span<>.

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Леонид Юрьев (Leonid Yuriev) 2023-11-24 15:49:05 +03:00
parent be8428257d
commit 0e250a4457
1 changed files with 72 additions and 0 deletions
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72
mdbx.h++
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@ -85,6 +85,10 @@
#include <experimental/filesystem>
#endif
#if defined(__cpp_lib_span) && __cpp_lib_span >= 202002L
#include <span>
#endif
#if __cplusplus >= 201103L
#include <chrono>
#include <ratio>
@ -699,6 +703,47 @@ struct LIBMDBX_API_TYPE slice : public ::MDBX_val {
MDBX_CXX14_CONSTEXPR slice(MDBX_val &&src);
MDBX_CXX14_CONSTEXPR slice(slice &&src) noexcept;
#if defined(DOXYGEN) || (defined(__cpp_lib_span) && __cpp_lib_span >= 202002L)
template <typename POD>
MDBX_CXX14_CONSTEXPR slice(const ::std::span<POD> &span)
: slice(span.begin(), span.end()) {
static_assert(::std::is_standard_layout<POD>::value &&
!::std::is_pointer<POD>::value,
"Must be a standard layout type!");
}
template <typename POD>
MDBX_CXX14_CONSTEXPR ::std::span<const POD> as_span() 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) == 0))
MDBX_CXX20_LIKELY
return ::std::span<const POD>(static_cast<const POD *>(data()),
size() / sizeof(POD));
throw_bad_value_size();
}
template <typename POD> MDBX_CXX14_CONSTEXPR ::std::span<POD> as_span() {
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) == 0))
MDBX_CXX20_LIKELY
return ::std::span<POD>(static_cast<POD *>(data()), size() / sizeof(POD));
throw_bad_value_size();
}
MDBX_CXX14_CONSTEXPR ::std::span<const byte> bytes() const {
return as_span<const byte>();
}
MDBX_CXX14_CONSTEXPR ::std::span<byte> bytes() { return as_span<byte>(); }
MDBX_CXX14_CONSTEXPR ::std::span<const char> chars() const {
return as_span<const char>();
}
MDBX_CXX14_CONSTEXPR ::std::span<char> chars() { return as_span<char>(); }
#endif /* __cpp_lib_span >= 202002L */
#if defined(DOXYGEN) || \
(defined(__cpp_lib_string_view) && __cpp_lib_string_view >= 201606L)
/// \brief Create a slice that refers to the same contents as "string_view"
@ -2368,6 +2413,33 @@ public:
return slice_;
}
#if defined(DOXYGEN) || (defined(__cpp_lib_span) && __cpp_lib_span >= 202002L)
template <typename POD>
MDBX_CXX14_CONSTEXPR buffer(const ::std::span<POD> &span)
: buffer(span.begin(), span.end()) {
static_assert(::std::is_standard_layout<POD>::value &&
!::std::is_pointer<POD>::value,
"Must be a standard layout type!");
}
template <typename POD>
MDBX_CXX14_CONSTEXPR ::std::span<const POD> as_span() const {
return slice_.template as_span<const POD>();
}
template <typename POD> MDBX_CXX14_CONSTEXPR ::std::span<POD> as_span() {
return slice_.template as_span<POD>();
}
MDBX_CXX14_CONSTEXPR ::std::span<const byte> bytes() const {
return as_span<const byte>();
}
MDBX_CXX14_CONSTEXPR ::std::span<byte> bytes() { return as_span<byte>(); }
MDBX_CXX14_CONSTEXPR ::std::span<const char> chars() const {
return as_span<const char>();
}
MDBX_CXX14_CONSTEXPR ::std::span<char> chars() { return as_span<char>(); }
#endif /* __cpp_lib_span >= 202002L */
template <typename POD>
static buffer wrap(const POD &pod, bool make_reference = false,
const allocator_type &allocator = allocator_type()) {