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cpp-libs
Actor Framework
Commits
afbdb170
Commit
afbdb170
authored
Feb 12, 2018
by
Dominik Charousset
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Enable CAF visit only if used with CAF variants
parent
a8c7dd29
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1
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1 changed file
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27 additions
and
18 deletions
+27
-18
libcaf_core/caf/variant.hpp
libcaf_core/caf/variant.hpp
+27
-18
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libcaf_core/caf/variant.hpp
View file @
afbdb170
...
@@ -61,6 +61,21 @@ struct variant_marker_t {};
...
@@ -61,6 +61,21 @@ struct variant_marker_t {};
constexpr
variant_marker_t
variant_marker
=
variant_marker_t
{};
constexpr
variant_marker_t
variant_marker
=
variant_marker_t
{};
template
<
class
T
>
struct
is_variant
:
std
::
false_type
{};
template
<
class
...
Ts
>
struct
is_variant
<
variant
<
Ts
...
>>
:
std
::
true_type
{};
template
<
class
...
Ts
>
struct
is_variant
<
variant
<
Ts
...
>&>
:
std
::
true_type
{};
template
<
class
...
Ts
>
struct
is_variant
<
const
variant
<
Ts
...
>&>
:
std
::
true_type
{};
template
<
class
...
Ts
>
struct
is_variant
<
const
variant
<
Ts
...
>&&>
:
std
::
true_type
{};
template
<
class
T
>
template
<
class
T
>
struct
variant_assign_helper
{
struct
variant_assign_helper
{
using
result_type
=
void
;
using
result_type
=
void
;
...
@@ -83,12 +98,20 @@ struct variant_move_helper {
...
@@ -83,12 +98,20 @@ struct variant_move_helper {
}
}
};
};
template
<
class
F
,
class
...
Ts
>
template
<
bool
Valid
,
class
F
,
class
...
Ts
>
struct
variant_visit_result
{
struct
variant_visit_result
_impl
{
using
type
=
using
type
=
decltype
((
std
::
declval
<
F
&>
())(
std
::
declval
<
typename
Ts
::
type0
&>
()...));
decltype
((
std
::
declval
<
F
&>
())(
std
::
declval
<
typename
Ts
::
type0
&>
()...));
};
};
template
<
class
F
,
class
...
Ts
>
struct
variant_visit_result_impl
<
false
,
F
,
Ts
...
>
{};
template
<
class
F
,
class
...
Ts
>
struct
variant_visit_result
:
variant_visit_result_impl
<
detail
::
conjunction
<
is_variant
<
Ts
>::
value
...
>::
value
,
F
,
Ts
...
>
{};
template
<
class
F
,
class
...
Ts
>
template
<
class
F
,
class
...
Ts
>
using
variant_visit_result_t
=
using
variant_visit_result_t
=
typename
variant_visit_result
<
detail
::
decay_t
<
F
>
,
typename
variant_visit_result
<
detail
::
decay_t
<
F
>
,
...
@@ -119,21 +142,6 @@ struct is_same_ish
...
@@ -119,21 +142,6 @@ struct is_same_ish
is_equal_int_type
<
T
,
U
>
is_equal_int_type
<
T
,
U
>
>::
type
{
};
>::
type
{
};
template
<
class
T
>
struct
is_variant
:
std
::
false_type
{};
template
<
class
...
Ts
>
struct
is_variant
<
variant
<
Ts
...
>>
:
std
::
true_type
{};
template
<
class
...
Ts
>
struct
is_variant
<
variant
<
Ts
...
>&>
:
std
::
true_type
{};
template
<
class
...
Ts
>
struct
is_variant
<
const
variant
<
Ts
...
>&>
:
std
::
true_type
{};
template
<
class
...
Ts
>
struct
is_variant
<
const
variant
<
Ts
...
>&&>
:
std
::
true_type
{};
/// A variant represents always a valid value of one of the types `Ts...`.
/// A variant represents always a valid value of one of the types `Ts...`.
template
<
class
...
Ts
>
template
<
class
...
Ts
>
class
variant
{
class
variant
{
...
@@ -395,7 +403,8 @@ const T* get_if(const variant<Us...>* value) {
...
@@ -395,7 +403,8 @@ const T* get_if(const variant<Us...>* value) {
/// @relates variant
/// @relates variant
template
<
class
Visitor
,
class
Variant
,
class
...
Variants
,
template
<
class
Visitor
,
class
Variant
,
class
...
Variants
,
class
Result
=
variant_visit_result_t
<
Visitor
,
Variant
,
Variants
...>
>
class
Result
=
variant_visit_result_t
<
Visitor
,
Variant
,
Variants
...>
>
Result
visit
(
Visitor
&&
f
,
Variant
&&
x
,
Variants
&&
...
xs
)
{
detail
::
enable_if_t
<
is_variant
<
Variant
>::
value
,
Result
>
visit
(
Visitor
&&
f
,
Variant
&&
x
,
Variants
&&
...
xs
)
{
return
x
.
template
apply
<
Result
>(
std
::
forward
<
Visitor
>
(
f
),
return
x
.
template
apply
<
Result
>(
std
::
forward
<
Visitor
>
(
f
),
std
::
forward
<
Variants
>
(
xs
)...);
std
::
forward
<
Variants
>
(
xs
)...);
}
}
...
...
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