-
Notifications
You must be signed in to change notification settings - Fork 50
/
blob.hpp
67 lines (50 loc) · 3.52 KB
/
blob.hpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
#ifndef _C4_BLOB_HPP_
#define _C4_BLOB_HPP_
#include "c4/types.hpp"
#include "c4/error.hpp"
/** @file blob.hpp Mutable and immutable binary data blobs.
*/
namespace c4 {
template<class T>
struct blob_;
namespace detail {
template<class T> struct is_blob_type : std::integral_constant<bool, false> {};
template<class T> struct is_blob_type<blob_<T>> : std::integral_constant<bool, true> {};
template<class T> struct is_blob_value_type : std::integral_constant<bool, (std::is_fundamental<T>::value || std::is_trivially_copyable<T>::value)> {};
} // namespace
template<class T>
struct blob_
{
static_assert(std::is_same<T, byte>::value || std::is_same<T, cbyte>::value, "must be either byte or cbyte");
static_assert(sizeof(T) == 1u, "must be either byte or cbyte");
public:
T * buf;
size_t len;
public:
C4_ALWAYS_INLINE blob_() noexcept = default;
C4_ALWAYS_INLINE blob_(blob_ const& that) noexcept = default;
C4_ALWAYS_INLINE blob_(blob_ && that) noexcept = default;
C4_ALWAYS_INLINE blob_& operator=(blob_ && that) noexcept = default;
C4_ALWAYS_INLINE blob_& operator=(blob_ const& that) noexcept = default;
template<class U, class=typename std::enable_if<std::is_const<T>::value && std::is_same<typename std::add_const<U>::type, T>::value, U>::type> C4_ALWAYS_INLINE blob_(blob_<U> const& that) noexcept : buf(that.buf), len(that.len) {}
template<class U, class=typename std::enable_if<std::is_const<T>::value && std::is_same<typename std::add_const<U>::type, T>::value, U>::type> C4_ALWAYS_INLINE blob_(blob_<U> && that) noexcept : buf(that.buf), len(that.len) {}
template<class U, class=typename std::enable_if<std::is_const<T>::value && std::is_same<typename std::add_const<U>::type, T>::value, U>::type> C4_ALWAYS_INLINE blob_& operator=(blob_<U> && that) noexcept { buf = that.buf; len = that.len; }
template<class U, class=typename std::enable_if<std::is_const<T>::value && std::is_same<typename std::add_const<U>::type, T>::value, U>::type> C4_ALWAYS_INLINE blob_& operator=(blob_<U> const& that) noexcept { buf = that.buf; len = that.len; }
C4_ALWAYS_INLINE blob_(void *ptr, size_t n) noexcept : buf(reinterpret_cast<T*>(ptr)), len(n) {}
C4_ALWAYS_INLINE blob_(void const *ptr, size_t n) noexcept : buf(reinterpret_cast<T*>(ptr)), len(n) {}
#define _C4_REQUIRE_BLOBTYPE(ty) class=typename std::enable_if<((!detail::is_blob_type<ty>::value) && (detail::is_blob_value_type<ty>::value)), T>::type
template<class U, _C4_REQUIRE_BLOBTYPE(U)> C4_ALWAYS_INLINE blob_(U &var) noexcept : buf(reinterpret_cast<T*>(&var)), len(sizeof(U)) {}
template<class U, _C4_REQUIRE_BLOBTYPE(U)> C4_ALWAYS_INLINE blob_(U *ptr, size_t n) noexcept : buf(reinterpret_cast<T*>(ptr)), len(sizeof(U) * n) { C4_ASSERT(is_aligned(ptr)); }
template<class U, _C4_REQUIRE_BLOBTYPE(U)> C4_ALWAYS_INLINE blob_& operator= (U &var) noexcept { buf = reinterpret_cast<T*>(&var); len = sizeof(U); return *this; }
template<class U, size_t N, _C4_REQUIRE_BLOBTYPE(U)> C4_ALWAYS_INLINE blob_(U (&arr)[N]) noexcept : buf(reinterpret_cast<T*>(arr)), len(sizeof(U) * N) {}
template<class U, size_t N, _C4_REQUIRE_BLOBTYPE(U)> C4_ALWAYS_INLINE blob_& operator= (U (&arr)[N]) noexcept { buf = reinterpret_cast<T*>(arr); len = sizeof(U) * N; return *this; }
#undef _C4_REQUIRE_BLOBTYPE
};
/** an immutable binary blob */
using cblob = blob_<cbyte>;
/** a mutable binary blob */
using blob = blob_< byte>;
C4_MUST_BE_TRIVIAL_COPY(blob);
C4_MUST_BE_TRIVIAL_COPY(cblob);
} // namespace c4
#endif // _C4_BLOB_HPP_