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体验新版 GitCode,发现更多精彩内容 >>
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6b84c415
编写于
12月 08, 2016
作者:
N
Niels Lohmann
浏览文件
操作
浏览文件
下载
电子邮件补丁
差异文件
🔨
refactored get_from_vector function
Snippet from
http://stackoverflow.com/a/41031865/266378
上级
81a42724
变更
2
隐藏空白更改
内联
并排
Showing
2 changed file
with
63 addition
and
59 deletion
+63
-59
src/json.hpp
src/json.hpp
+35
-30
src/json.hpp.re2c
src/json.hpp.re2c
+28
-29
未找到文件。
src/json.hpp
浏览文件 @
6b84c415
...
...
@@ -6262,36 +6262,35 @@ class basic_json
}
}
template
<
typename
T
,
typename
std
::
enable_if
<
sizeof
(
T
)
==
1
,
int
>
::
type
=
0
>
static
constexpr
T
get_from_vector
(
const
std
::
vector
<
uint8_t
>&
vec
,
const
size_t
current_idx
)
{
return
static_cast
<
T
>
(
vec
[
current_idx
+
1
]);
}
template
<
typename
T
,
typename
std
::
enable_if
<
sizeof
(
T
)
==
2
,
int
>
::
type
=
0
>
static
constexpr
T
get_from_vector
(
const
std
::
vector
<
uint8_t
>&
vec
,
const
size_t
current_idx
)
{
return
static_cast
<
T
>
((
static_cast
<
T
>
(
vec
[
current_idx
+
1
])
<<
010
)
+
static_cast
<
T
>
(
vec
[
current_idx
+
2
]));
}
template
<
typename
T
,
typename
std
::
enable_if
<
sizeof
(
T
)
==
4
,
int
>
::
type
=
0
>
static
constexpr
T
get_from_vector
(
const
std
::
vector
<
uint8_t
>&
vec
,
const
size_t
current_idx
)
{
return
static_cast
<
T
>
((
static_cast
<
T
>
(
vec
[
current_idx
+
1
])
<<
030
)
+
(
static_cast
<
T
>
(
vec
[
current_idx
+
2
])
<<
020
)
+
(
static_cast
<
T
>
(
vec
[
current_idx
+
3
])
<<
010
)
+
static_cast
<
T
>
(
vec
[
current_idx
+
4
]));
}
template
<
typename
T
,
typename
std
::
enable_if
<
sizeof
(
T
)
==
8
,
int
>
::
type
=
0
>
static
constexpr
T
get_from_vector
(
const
std
::
vector
<
uint8_t
>&
vec
,
const
size_t
current_idx
)
/*
Precondition:
vec: | | | a | b | c | d | | | T: | | | | |
^ ^ ^ ^
current_index idx ptr sizeof(T)
Postcondition:
vec: | | | a | b | c | d | | | T: | d | c | b | a |
^ ^ ^
| idx ptr
current_index
Code from <http://stackoverflow.com/a/41031865/266378>
*/
template
<
typename
T
>
static
T
get_from_vector
(
const
std
::
vector
<
uint8_t
>&
vec
,
const
size_t
current_index
)
{
return
static_cast
<
T
>
((
static_cast
<
T
>
(
vec
[
current_idx
+
1
])
<<
070
)
+
(
static_cast
<
T
>
(
vec
[
current_idx
+
2
])
<<
060
)
+
(
static_cast
<
T
>
(
vec
[
current_idx
+
3
])
<<
050
)
+
(
static_cast
<
T
>
(
vec
[
current_idx
+
4
])
<<
040
)
+
(
static_cast
<
T
>
(
vec
[
current_idx
+
5
])
<<
030
)
+
(
static_cast
<
T
>
(
vec
[
current_idx
+
6
])
<<
020
)
+
(
static_cast
<
T
>
(
vec
[
current_idx
+
7
])
<<
010
)
+
static_cast
<
T
>
(
vec
[
current_idx
+
8
]))
;
T
result
;
uint8_t
*
ptr
=
reinterpret_cast
<
uint8_t
*>
(
&
result
);
size_t
idx
=
current_index
+
1
+
sizeof
(
T
);
while
(
idx
>
current_index
)
{
*
ptr
++
=
vec
[
--
idx
];
}
return
result
;
}
static
void
to_msgpack_internal
(
const
basic_json
&
j
,
std
::
vector
<
uint8_t
>&
v
)
...
...
@@ -7173,7 +7172,13 @@ class basic_json
{
idx
+=
2
;
// skip two content bytes
// code from RFC 7049, Appendix D
// code from RFC 7049, Appendix D, Figure 3:
// As half-precision floating-point numbers were only added to IEEE
// 754 in 2008, today's programming platforms often still only have
// limited support for them. It is very easy to include at least
// decoding support for them even without such support. An example
// of a small decoder for half-precision floating-point numbers in
// the C language is shown in Figure 3.
const
int
half
=
(
v
[
current_idx
+
1
]
<<
8
)
+
v
[
current_idx
+
2
];
const
int
exp
=
(
half
>>
10
)
&
0x1f
;
const
int
mant
=
half
&
0x3ff
;
...
...
src/json.hpp.re2c
浏览文件 @
6b84c415
...
...
@@ -6262,36 +6262,35 @@ class basic_json
}
}
template<typename T, typename std::enable_if<sizeof(T) == 1, int>::type = 0>
static constexpr T get_from_vector(const std::vector<uint8_t>& vec, const size_t current_idx)
{
return static_cast<T>(vec[current_idx + 1]);
}
template<typename T, typename std::enable_if<sizeof(T) == 2, int>::type = 0>
static constexpr T get_from_vector(const std::vector<uint8_t>& vec, const size_t current_idx)
{
return static_cast<T>((static_cast<T>(vec[current_idx + 1]) << 010) +
static_cast<T>(vec[current_idx + 2]));
}
template<typename T, typename std::enable_if<sizeof(T) == 4, int>::type = 0>
static constexpr T get_from_vector(const std::vector<uint8_t>& vec, const size_t current_idx)
{
return static_cast<T>((static_cast<T>(vec[current_idx + 1]) << 030) +
(static_cast<T>(vec[current_idx + 2]) << 020) +
(static_cast<T>(vec[current_idx + 3]) << 010) +
static_cast<T>(vec[current_idx + 4]));
}
template<typename T, typename std::enable_if<sizeof(T) == 8, int>::type = 0>
static constexpr T get_from_vector(const std::vector<uint8_t>& vec, const size_t current_idx)
/*
Precondition:
vec: | | | a | b | c | d | | | T: | | | | |
^ ^ ^ ^
current_index idx ptr sizeof(T)
Postcondition:
vec: | | | a | b | c | d | | | T: | d | c | b | a |
^ ^ ^
| idx ptr
current_index
Code from <http://stackoverflow.com/a/41031865/266378>
*/
template<typename T>
static T get_from_vector(const std::vector<uint8_t>& vec, const size_t current_index)
{
return static_cast<T>((static_cast<T>(vec[current_idx + 1]) << 070) +
(static_cast<T>(vec[current_idx + 2]) << 060) +
(static_cast<T>(vec[current_idx + 3]) << 050) +
(static_cast<T>(vec[current_idx + 4]) << 040) +
(static_cast<T>(vec[current_idx + 5]) << 030) +
(static_cast<T>(vec[current_idx + 6]) << 020) +
(static_cast<T>(vec[current_idx + 7]) << 010) +
static_cast<T>(vec[current_idx + 8]))
;
T result;
uint8_t* ptr = reinterpret_cast<uint8_t*>(&result);
size_t idx = current_index + 1 + sizeof(T);
while (idx > current_index)
{
*ptr++ = vec[--idx];
}
return result
;
}
static void to_msgpack_internal(const basic_json& j, std::vector<uint8_t>& v)
...
...
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