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Libraries
json
Commits
467986fe
Unverified
Commit
467986fe
authored
Dec 14, 2020
by
Niels Lohmann
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♻
do not unconditionally redefine C++14 constructs
parent
2fc1f694
Changes
2
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2 changed files
with
41 additions
and
8 deletions
+41
-8
include/nlohmann/detail/meta/cpp_future.hpp
include/nlohmann/detail/meta/cpp_future.hpp
+20
-4
single_include/nlohmann/json.hpp
single_include/nlohmann/json.hpp
+21
-4
No files found.
include/nlohmann/detail/meta/cpp_future.hpp
View file @
467986fe
...
...
@@ -2,19 +2,32 @@
#include <cstddef> // size_t
#include <type_traits> // conditional, enable_if, false_type, integral_constant, is_constructible, is_integral, is_same, remove_cv, remove_reference, true_type
#include <utility> // index_sequence, make_index_sequence, index_sequence_for
#include <nlohmann/detail/macro_scope.hpp>
namespace
nlohmann
{
namespace
detail
{
// alias templates to reduce boilerplate
template
<
bool
B
,
typename
T
=
void
>
using
enable_if_t
=
typename
std
::
enable_if
<
B
,
T
>::
type
;
template
<
typename
T
>
using
uncvref_t
=
typename
std
::
remove_cv
<
typename
std
::
remove_reference
<
T
>::
type
>::
type
;
// implementation of C++14 index_sequence and affiliates
#ifdef JSON_HAS_CPP_14
// the following utilities are natively available in C++14
using
std
::
enable_if_t
;
using
std
::
index_sequence
;
using
std
::
make_index_sequence
;
using
std
::
index_sequence_for
;
#else
// alias templates to reduce boilerplate
template
<
bool
B
,
typename
T
=
void
>
using
enable_if_t
=
typename
std
::
enable_if
<
B
,
T
>::
type
;
// source: https://stackoverflow.com/a/32223343
template
<
std
::
size_t
...
Ints
>
struct
index_sequence
...
...
@@ -45,6 +58,8 @@ template<> struct make_index_sequence<1> : index_sequence<0> {};
template
<
typename
...
Ts
>
using
index_sequence_for
=
make_index_sequence
<
sizeof
...(
Ts
)
>
;
#endif
// dispatch utility (taken from ranges-v3)
template
<
unsigned
N
>
struct
priority_tag
:
priority_tag
<
N
-
1
>
{};
template
<
>
struct
priority_tag
<
0
>
{};
...
...
@@ -58,5 +73,6 @@ struct static_const
template
<
typename
T
>
constexpr
T
static_const
<
T
>::
value
;
}
// namespace detail
}
// namespace nlohmann
single_include/nlohmann/json.hpp
View file @
467986fe
...
...
@@ -2736,19 +2736,33 @@ class other_error : public exception
#include <cstddef> // size_t
#include <type_traits> // conditional, enable_if, false_type, integral_constant, is_constructible, is_integral, is_same, remove_cv, remove_reference, true_type
#include <utility> // index_sequence, make_index_sequence, index_sequence_for
// #include <nlohmann/detail/macro_scope.hpp>
namespace
nlohmann
{
namespace
detail
{
// alias templates to reduce boilerplate
template
<
bool
B
,
typename
T
=
void
>
using
enable_if_t
=
typename
std
::
enable_if
<
B
,
T
>::
type
;
template
<
typename
T
>
using
uncvref_t
=
typename
std
::
remove_cv
<
typename
std
::
remove_reference
<
T
>::
type
>::
type
;
// implementation of C++14 index_sequence and affiliates
#ifdef JSON_HAS_CPP_14
// the following utilities are natively available in C++14
using
std
::
enable_if_t
;
using
std
::
index_sequence
;
using
std
::
make_index_sequence
;
using
std
::
index_sequence_for
;
#else
// alias templates to reduce boilerplate
template
<
bool
B
,
typename
T
=
void
>
using
enable_if_t
=
typename
std
::
enable_if
<
B
,
T
>::
type
;
// source: https://stackoverflow.com/a/32223343
template
<
std
::
size_t
...
Ints
>
struct
index_sequence
...
...
@@ -2779,6 +2793,8 @@ template<> struct make_index_sequence<1> : index_sequence<0> {};
template
<
typename
...
Ts
>
using
index_sequence_for
=
make_index_sequence
<
sizeof
...(
Ts
)
>
;
#endif
// dispatch utility (taken from ranges-v3)
template
<
unsigned
N
>
struct
priority_tag
:
priority_tag
<
N
-
1
>
{};
template
<
>
struct
priority_tag
<
0
>
{};
...
...
@@ -2792,6 +2808,7 @@ struct static_const
template
<
typename
T
>
constexpr
T
static_const
<
T
>::
value
;
}
// namespace detail
}
// namespace nlohmann
...
...
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