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cpp-libs
Actor Framework
Commits
63fc9aa4
Commit
63fc9aa4
authored
Dec 15, 2018
by
Dominik Charousset
Committed by
Dominik Charousset
Dec 27, 2018
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Add move-only replacement for std::function
parent
ec6a8927
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2 changed files
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libcaf_core/caf/detail/unique_function.hpp
libcaf_core/caf/detail/unique_function.hpp
+195
-0
libcaf_core/test/unique_function.cpp
libcaf_core/test/unique_function.cpp
+178
-0
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libcaf_core/caf/detail/unique_function.hpp
0 → 100644
View file @
63fc9aa4
/******************************************************************************
* ____ _ _____ *
* / ___| / \ | ___| C++ *
* | | / _ \ | |_ Actor *
* | |___ / ___ \| _| Framework *
* \____/_/ \_|_| *
* *
* Copyright 2011-2018 Dominik Charousset *
* *
* Distributed under the terms and conditions of the BSD 3-Clause License or *
* (at your option) under the terms and conditions of the Boost Software *
* License 1.0. See accompanying files LICENSE and LICENSE_ALTERNATIVE. *
* *
* If you did not receive a copy of the license files, see *
* http://opensource.org/licenses/BSD-3-Clause and *
* http://www.boost.org/LICENSE_1_0.txt. *
******************************************************************************/
#pragma once
#include <type_traits>
namespace
caf
{
namespace
detail
{
/// A move-only replacement for `std::function`.
template
<
class
Signature
>
class
unique_function
;
template
<
class
R
,
class
...
Ts
>
class
unique_function
<
R
(
Ts
...)
>
{
public:
// -- member types -----------------------------------------------------------
/// Function object that dispatches application with a virtual member
/// function.
class
wrapper
{
public:
virtual
~
wrapper
()
{
// nop
}
virtual
R
operator
()(
Ts
...)
=
0
;
};
/// Native function pointer.
using
raw_pointer
=
R
(
*
)(
Ts
...);
/// Pointer to a function wrapper.
using
wrapper_pointer
=
wrapper
*
;
// -- factory functions ------------------------------------------------------
/// Creates a new function object wrapper.
template
<
class
F
>
static
wrapper_pointer
make_wrapper
(
F
&&
f
)
{
class
impl
final
:
public
wrapper
{
public:
impl
(
F
&&
fun
)
:
fun_
(
std
::
move
(
fun
))
{
// nop
}
R
operator
()(
Ts
...
xs
)
override
{
return
fun_
(
xs
...);
}
private:
F
fun_
;
};
return
new
impl
(
std
::
forward
<
F
>
(
f
));
}
unique_function
()
:
holds_wrapper_
(
false
),
fptr_
(
nullptr
)
{
// nop
}
unique_function
(
unique_function
&&
other
)
:
holds_wrapper_
(
other
.
holds_wrapper_
)
{
fptr_
=
other
.
fptr_
;
if
(
other
.
holds_wrapper_
)
other
.
holds_wrapper_
=
false
;
other
.
fptr_
=
nullptr
;
}
unique_function
(
const
unique_function
&
)
=
delete
;
explicit
unique_function
(
raw_pointer
fun
)
:
holds_wrapper_
(
false
),
fptr_
(
fun
)
{
// nop
}
explicit
unique_function
(
wrapper_pointer
ptr
)
:
holds_wrapper_
(
true
),
wptr_
(
ptr
)
{
// nop
}
template
<
class
T
,
class
=
typename
std
::
enable_if
<
!
std
::
is_convertible
<
T
,
raw_pointer
>
::
value
&&
std
::
is_same
<
decltype
((
std
::
declval
<
T
&>
())(
std
::
declval
<
Ts
>
()...)),
R
>::
value
>::
type
>
explicit
unique_function
(
T
f
)
:
unique_function
(
make_wrapper
(
std
::
move
(
f
)))
{
// nop
}
unique_function
&
operator
=
(
unique_function
&&
other
)
{
destroy
();
if
(
other
.
holds_wrapper_
)
{
holds_wrapper_
=
true
;
wptr_
=
other
.
wptr_
;
other
.
holds_wrapper_
=
false
;
other
.
fptr_
=
nullptr
;
}
else
{
holds_wrapper_
=
false
;
fptr_
=
other
.
fptr_
;
}
return
*
this
;
}
unique_function
&
operator
=
(
raw_pointer
f
)
{
return
*
this
=
unique_function
{
f
};
}
unique_function
&
operator
=
(
const
unique_function
&
)
=
delete
;
~
unique_function
()
{
destroy
();
}
R
operator
()(
Ts
...
xs
)
{
if
(
holds_wrapper_
)
return
(
*
wptr_
)(
std
::
move
(
xs
)...);
return
(
*
fptr_
)(
std
::
move
(
xs
)...);
}
bool
is_nullptr
()
const
noexcept
{
// No type dispatching needed, because the union puts both pointers into
// the same memory location.
return
fptr_
==
nullptr
;
}
bool
holds_wrapper
()
const
noexcept
{
return
holds_wrapper_
;
}
explicit
operator
bool
()
const
noexcept
{
// No type dispatching needed, because the union puts both pointers into
// the same memory location.
return
!
is_nullptr
();
}
bool
operator
!
()
const
noexcept
{
return
is_nullptr
();
}
private:
/// Destroys the managed wrapper.
void
destroy
()
{
if
(
holds_wrapper_
)
delete
wptr_
;
}
// -- member variables -------------------------------------------------------
bool
holds_wrapper_
;
union
{
raw_pointer
fptr_
;
wrapper_pointer
wptr_
;
};
};
template
<
class
T
>
bool
operator
==
(
const
unique_function
<
T
>&
x
,
std
::
nullptr_t
)
noexcept
{
return
x
.
is_nullptr
();
}
template
<
class
T
>
bool
operator
==
(
std
::
nullptr_t
,
const
unique_function
<
T
>&
x
)
noexcept
{
return
x
.
is_nullptr
();
}
template
<
class
T
>
bool
operator
!=
(
const
unique_function
<
T
>&
x
,
std
::
nullptr_t
)
noexcept
{
return
!
x
.
is_nullptr
();
}
template
<
class
T
>
bool
operator
!=
(
std
::
nullptr_t
,
const
unique_function
<
T
>&
x
)
noexcept
{
return
!
x
.
is_nullptr
();
}
}
// namespace detail
}
// namespace caf
libcaf_core/test/unique_function.cpp
0 → 100644
View file @
63fc9aa4
/******************************************************************************
* ____ _ _____ *
* / ___| / \ | ___| C++ *
* | | / _ \ | |_ Actor *
* | |___ / ___ \| _| Framework *
* \____/_/ \_|_| *
* *
* Copyright 2011-2018 Dominik Charousset *
* *
* Distributed under the terms and conditions of the BSD 3-Clause License or *
* (at your option) under the terms and conditions of the Boost Software *
* License 1.0. See accompanying files LICENSE and LICENSE_ALTERNATIVE. *
* *
* If you did not receive a copy of the license files, see *
* http://opensource.org/licenses/BSD-3-Clause and *
* http://www.boost.org/LICENSE_1_0.txt. *
******************************************************************************/
#define CAF_SUITE unique_function
#include "caf/detail/unique_function.hpp"
#include "caf/test/dsl.hpp"
namespace
{
using
int_fun
=
caf
::
detail
::
unique_function
<
int
()
>
;
int
fourty_two
()
{
return
42
;
}
class
instance_counting_wrapper
final
:
public
int_fun
::
wrapper
{
public:
instance_counting_wrapper
(
size_t
*
instance_counter
)
:
instance_counter_
(
instance_counter
)
{
*
instance_counter_
+=
1
;
}
~
instance_counting_wrapper
()
{
*
instance_counter_
-=
1
;
}
int
operator
()()
final
{
return
42
;
}
private:
size_t
*
instance_counter_
;
};
}
// namespace <anonymous>
#define CHECK_VALID(f) \
CAF_CHECK(!f.is_nullptr()); \
CAF_CHECK(f); \
CAF_CHECK(f != nullptr); \
CAF_CHECK(nullptr != f); \
CAF_CHECK(!(f == nullptr)); \
CAF_CHECK(!(nullptr == f)); \
CAF_CHECK(f() == 42)
#define CHECK_INVALID(f) \
CAF_CHECK(f.is_nullptr()); \
CAF_CHECK(!f); \
CAF_CHECK(f == nullptr); \
CAF_CHECK(nullptr == f); \
CAF_CHECK(!(f != nullptr)); \
CAF_CHECK(!(nullptr != f)); \
CAF_CHECK(!f.holds_wrapper())
CAF_TEST
(
default
construction
)
{
int_fun
f
;
CHECK_INVALID
(
f
);
}
CAF_TEST
(
raw
function
pointer
construction
)
{
int_fun
f
{
fourty_two
};
CHECK_VALID
(
f
);
}
CAF_TEST
(
stateless
lambda
construction
)
{
int_fun
f
{[]
{
return
42
;
}};
CHECK_VALID
(
f
);
CAF_CHECK
(
!
f
.
holds_wrapper
());
}
CAF_TEST
(
stateful
lambda
construction
)
{
int
i
=
42
;
int_fun
f
{[
=
]
{
return
i
;
}};
CHECK_VALID
(
f
);
CAF_CHECK
(
f
.
holds_wrapper
());
}
CAF_TEST
(
custom
wrapper
construction
)
{
size_t
instances
=
0
;
{
// lifetime scope of our counting wrapper
int_fun
f
{
new
instance_counting_wrapper
(
&
instances
)};
CHECK_VALID
(
f
);
CAF_CHECK
(
f
.
holds_wrapper
());
CAF_CHECK
(
instances
==
1
);
}
CAF_CHECK
(
instances
==
0
);
}
CAF_TEST
(
function
move
construction
)
{
int_fun
f
{
fourty_two
};
int_fun
g
{
std
::
move
(
f
)};
CHECK_INVALID
(
f
);
CHECK_VALID
(
g
);
CAF_CHECK
(
!
g
.
holds_wrapper
());
}
CAF_TEST
(
stateful
lambda
move
construction
)
{
int
i
=
42
;
int_fun
f
{[
=
]
{
return
i
;
}};
int_fun
g
{
std
::
move
(
f
)};
CHECK_INVALID
(
f
);
CHECK_VALID
(
g
);
CAF_CHECK
(
g
.
holds_wrapper
());
}
CAF_TEST
(
custom
wrapper
move
construction
)
{
size_t
instances
=
0
;
{
// lifetime scope of our counting wrapper
int_fun
f
{
new
instance_counting_wrapper
(
&
instances
)};
int_fun
g
{
std
::
move
(
f
)};
CHECK_INVALID
(
f
);
CHECK_VALID
(
g
);
CAF_CHECK
(
g
.
holds_wrapper
());
CAF_CHECK
(
instances
==
1
);
}
CAF_CHECK
(
instances
==
0
);
}
CAF_TEST
(
function
assign
)
{
size_t
instances
=
0
;
int_fun
f
;
int_fun
g
{
fourty_two
};
int_fun
h
{
new
instance_counting_wrapper
(
&
instances
)};
CAF_CHECK
(
instances
==
1
);
CHECK_INVALID
(
f
);
CHECK_VALID
(
g
);
CHECK_VALID
(
h
);
f
=
fourty_two
;
g
=
fourty_two
;
h
=
fourty_two
;
CAF_CHECK
(
instances
==
0
);
CHECK_VALID
(
f
);
CHECK_VALID
(
g
);
CHECK_VALID
(
h
);
}
CAF_TEST
(
move
assign
)
{
size_t
instances
=
0
;
int_fun
f
;
int_fun
g
{
fourty_two
};
int_fun
h
{
new
instance_counting_wrapper
(
&
instances
)};
CAF_CHECK
(
instances
==
1
);
CHECK_INVALID
(
f
);
CHECK_VALID
(
g
);
CHECK_VALID
(
h
);
g
=
std
::
move
(
h
);
CAF_CHECK
(
instances
==
1
);
CHECK_INVALID
(
f
);
CHECK_VALID
(
g
);
CHECK_INVALID
(
h
);
f
=
std
::
move
(
g
);
CAF_CHECK
(
instances
==
1
);
CHECK_VALID
(
f
);
CHECK_INVALID
(
g
);
CHECK_INVALID
(
h
);
f
=
int_fun
{};
CAF_CHECK
(
instances
==
0
);
CHECK_INVALID
(
f
);
CHECK_INVALID
(
g
);
CHECK_INVALID
(
h
);
}
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