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Commit 71867830 authored by Wenzel Jakob's avatar Wenzel Jakob
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switched cpp_function to use variadic arguments

parent fbe82bf9
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Showing with 211 additions and 175 deletions
include/pybind/operators.h
View file @ 71867830
......@@ -45,17 +45,17 @@ template <op_id, op_type, typename B, typename L, typename R> struct op_impl { }
/// Operator implementation generator
template <op_id id, op_type ot, typename L, typename R> struct op_ {
template <typename base, typename holder> void execute(pybind::class_<base, holder> &class_, const char *doc, return_value_policy policy) const {
typedef typename std::conditional<std::is_same<L, self_t>::value, base, L>::type L_type;
typedef typename std::conditional<std::is_same<R, self_t>::value, base, R>::type R_type;
typedef op_impl<id, ot, base, L_type, R_type> op;
class_.def(op::name(), &op::execute, doc, policy);
template <typename Base, typename Holder, typename... Extra> void execute(pybind::class_<Base, Holder> &class_, Extra&&... extra) const {
typedef typename std::conditional<std::is_same<L, self_t>::value, Base, L>::type L_type;
typedef typename std::conditional<std::is_same<R, self_t>::value, Base, R>::type R_type;
typedef op_impl<id, ot, Base, L_type, R_type> op;
class_.def(op::name(), &op::execute, std::forward<Extra>(extra)...);
}
template <typename base, typename holder> void execute_cast(pybind::class_<base, holder> &class_, const char *doc, return_value_policy policy) const {
typedef typename std::conditional<std::is_same<L, self_t>::value, base, L>::type L_type;
typedef typename std::conditional<std::is_same<R, self_t>::value, base, R>::type R_type;
typedef op_impl<id, ot, base, L_type, R_type> op;
class_.def(op::name(), &op::execute_cast, doc, policy);
template <typename Base, typename Holder, typename... Extra> void execute_cast(pybind::class_<Base, Holder> &class_, Extra&&... extra) const {
typedef typename std::conditional<std::is_same<L, self_t>::value, Base, L>::type L_type;
typedef typename std::conditional<std::is_same<R, self_t>::value, Base, R>::type R_type;
typedef op_impl<id, ot, Base, L_type, R_type> op;
class_.def(op::name(), &op::execute_cast, std::forward<Extra>(extra)...);
}
};
......
include/pybind/pybind.h
View file @ 71867830
......@@ -22,16 +22,48 @@
NAMESPACE_BEGIN(pybind)
template <typename T> struct arg_t;
/// Annotation for keyword arguments
struct arg {
arg(const char *name) : name(name) { }
template <typename T> inline arg_t<T> operator=(const T &value);
const char *name;
};
/// Annotation for keyword arguments with default values
template <typename T> struct arg_t : public arg {
arg_t(const char *name, const T &value) : arg(name), value(value) { }
T value;
};
template <typename T> inline arg_t<T> arg::operator=(const T &value) { return arg_t<T>(name, value); }
/// Annotation for methods
struct is_method { };
/// Annotation for documentation
struct doc { const char *value; doc(const char *value) : value(value) { } };
/// Annotation for function names
struct name { const char *value; name(const char *value) : value(value) { } };
/// Annotation for function siblings
struct sibling { PyObject *value; sibling(handle value) : value(value.ptr()) { } };
/// Wraps an arbitrary C++ function/method/lambda function/.. into a callable Python object
class cpp_function : public function {
private:
/// Chained list of function entries for overloading
struct function_entry {
PyObject * (*impl) (function_entry *, PyObject *, PyObject *);
const char *name = nullptr;
PyObject * (*impl) (function_entry *, PyObject *, PyObject *, PyObject *);
void *data;
std::string signature, doc;
bool is_constructor;
return_value_policy policy;
bool is_constructor = false, is_method = false;
short keywords = 0;
return_value_policy policy = return_value_policy::automatic;
std::string signature;
PyObject *sibling = nullptr;
const char *doc = nullptr;
function_entry *next = nullptr;
};
......@@ -41,93 +73,121 @@ private:
std::is_void<T>::value, detail::void_type, typename detail::decay<T>::type>::type>;
/// Picks a suitable argument value converter from cast.h
template <typename ... T> using arg_value_caster =
template <typename... T> using arg_value_caster =
detail::type_caster<typename std::tuple<T...>>;
template <typename... T> void process_args(const std::tuple<T...> &args, function_entry *entry) {
process_args(args, entry, typename detail::make_index_sequence<sizeof...(T)>::type());
}
template <typename... T, size_t ... Index> void process_args(const
std::tuple<T...> &args, function_entry *entry,
detail::index_sequence<Index...>) {
int unused[] = { 0, (process_arg(std::get<Index>(args), entry), 0)... };
(void) unused;
}
void process_arg(const char *doc, function_entry *entry) { entry->doc = doc; }
void process_arg(const pybind::doc &d, function_entry *entry) { entry->doc = d.value; }
void process_arg(const pybind::name &n, function_entry *entry) { entry->name = n.value; }
void process_arg(const pybind::arg &, function_entry *entry) { entry->keywords++; }
void process_arg(const pybind::is_method &, function_entry *entry) { entry->is_method = true; }
void process_arg(const pybind::return_value_policy p, function_entry *entry) { entry->policy = p; }
void process_arg(pybind::sibling s, function_entry *entry) { entry->sibling = s.value; }
public:
cpp_function() { }
/// Vanilla function pointers
template <typename return_type, typename... arg_type>
cpp_function(return_type (*f)(arg_type...), const char *name = nullptr,
const char *doc = nullptr, return_value_policy policy = return_value_policy::automatic,
const function &sibling = function(), bool is_method = false) {
template <typename Return, typename... Arg, typename... Extra>
cpp_function(Return (*f)(Arg...), Extra&&... extra) {
struct capture {
Return (*f)(Arg...);
std::tuple<Extra...> extra;
};
typedef arg_value_caster<arg_type...> cast_in;
typedef return_value_caster<return_type> cast_out;
function_entry *entry = new function_entry();
entry->data = new capture { f, std::tuple<Extra...>(std::forward<Extra>(extra)...) };
auto impl = [](function_entry *entry, PyObject *pyArgs, PyObject *parent) -> PyObject * {
typedef arg_value_caster<Arg...> cast_in;
typedef return_value_caster<Return> cast_out;
entry->impl = [](function_entry *entry, PyObject *pyArgs, PyObject *kwargs, PyObject *parent) -> PyObject * {
cast_in args;
if (!args.load(pyArgs, true)) return nullptr;
auto f = (return_type (*) (arg_type...)) entry->data;
return cast_out::cast(args.template call<return_type>(f),
entry->policy, parent);
auto f = ((capture *) entry->data)->f;
(void)kwargs;
return cast_out::cast(args.template call<Return>(f), entry->policy, parent);
};
initialize(name, doc, cast_in::name() + std::string(" -> ") + cast_out::name(),
sibling, is_method, policy, impl, (void *) f);
entry->signature = cast_in::name();
entry->signature += " -> ";
entry->signature += cast_out::name();
process_args(((capture *) entry->data)->extra, entry);
initialize(entry);
}
/// Delegating helper constructor to deal with lambda functions
template <typename func>
cpp_function(func &&f, const char *name = nullptr,
const char *doc = nullptr,
return_value_policy policy = return_value_policy::automatic,
const function &sibling = function(), bool is_method = false) {
initialize(std::forward<func>(f), name, doc, policy, sibling, is_method,
template <typename Func, typename... Extra> cpp_function(Func &&f, Extra&&... extra) {
initialize(std::forward<Func>(f),
(typename detail::remove_class<decltype(
&std::remove_reference<func>::type::operator())>::type *) nullptr);
&std::remove_reference<Func>::type::operator())>::type *) nullptr,
std::forward<Extra>(extra)...);
}
/// Class methods (non-const)
template <typename return_type, typename class_type, typename ... arg_type> cpp_function(
return_type (class_type::*f)(arg_type...), const char *name = nullptr,
const char *doc = nullptr, return_value_policy policy = return_value_policy::automatic,
const function &sibling = function(), bool is_method = false) {
initialize([f](class_type *c, arg_type... args) -> return_type { return (c->*f)(args...); },
name, doc, policy, sibling, is_method, (return_type (*)(class_type *, arg_type ...)) nullptr);
template <typename Return, typename Class, typename... Arg, typename... Extra> cpp_function(
Return (Class::*f)(Arg...), Extra&&... extra) {
initialize([f](Class *c, Arg... args) -> Return { return (c->*f)(args...); },
(Return (*) (Class *, Arg...)) nullptr, std::forward<Extra>(extra)...);
}
/// Class methods (const)
template <typename return_type, typename class_type, typename ... arg_type> cpp_function(
return_type (class_type::*f)(arg_type...) const, const char *name = nullptr,
const char *doc = nullptr, return_value_policy policy = return_value_policy::automatic,
const function &sibling = function(), bool is_method = false) {
initialize([f](const class_type *c, arg_type... args) -> return_type { return (c->*f)(args...); },
name, doc, policy, sibling, is_method, (return_type (*)(const class_type *, arg_type ...)) nullptr);
template <typename Return, typename Class, typename... Arg, typename... Extra> cpp_function(
Return (Class::*f)(Arg...) const, Extra&&... extra) {
initialize([f](const Class *c, Arg... args) -> Return { return (c->*f)(args...); },
(Return (*)(const Class *, Arg ...)) nullptr, std::forward<Extra>(extra)...);
}
private:
/// Functors, lambda functions, etc.
template <typename func, typename return_type, typename... arg_type>
void initialize(func &&f, const char *name, const char *doc,
return_value_policy policy, const function &sibling,
bool is_method, return_type (*)(arg_type...)) {
template <typename Func, typename Return, typename... Arg, typename... Extra>
void initialize(Func &&f, Return (*)(Arg...), Extra&&... extra) {
struct capture {
typename std::remove_reference<Func>::type f;
std::tuple<Extra...> extra;
};
typedef arg_value_caster<arg_type...> cast_in;
typedef return_value_caster<return_type> cast_out;
struct capture { typename std::remove_reference<func>::type f; };
void *ptr = new capture { std::forward<func>(f) };
function_entry *entry = new function_entry();
entry->data = new capture { std::forward<Func>(f), std::tuple<Extra...>(std::forward<Extra>(extra)...) };
typedef arg_value_caster<Arg...> cast_in;
typedef return_value_caster<Return> cast_out;
auto impl = [](function_entry *entry, PyObject *pyArgs, PyObject *parent) -> PyObject *{
entry->impl = [](function_entry *entry, PyObject *pyArgs, PyObject *kwargs, PyObject *parent) -> PyObject *{
cast_in args;
if (!args.load(pyArgs, true)) return nullptr;
func &f = ((capture *) entry->data)->f;
return cast_out::cast(args.template call<return_type>(f),
entry->policy, parent);
Func &f = ((capture *) entry->data)->f;
(void)kwargs;
return cast_out::cast(args.template call<Return>(f), entry->policy, parent);
};
initialize(name, doc, cast_in::name() + std::string(" -> ") + cast_out::name(),
sibling, is_method, policy, impl, ptr);
entry->signature = cast_in::name();
entry->signature += " -> ";
entry->signature += cast_out::name();
process_args(((capture *) entry->data)->extra, entry);
initialize(entry);
}
static PyObject *dispatcher(PyObject *self, PyObject *args, PyObject * /* kwargs */) {
static PyObject *dispatcher(PyObject *self, PyObject *args, PyObject *kwargs ) {
function_entry *overloads = (function_entry *) PyCapsule_GetPointer(self, nullptr);
PyObject *result = nullptr;
PyObject *parent = PyTuple_Size(args) > 0 ? PyTuple_GetItem(args, 0) : nullptr;
try {
for (function_entry *it = overloads; it != nullptr; it = it->next) {
if ((result = it->impl(it, args, parent)) != nullptr)
if ((result = it->impl(it, args, kwargs, parent)) != nullptr)
break;
}
} catch (const error_already_set &) { return nullptr;
......@@ -161,27 +221,16 @@ private:
}
}
void initialize(const char *name, const char *doc,
const std::string &signature, function sibling,
bool is_method, return_value_policy policy,
PyObject *(*impl) (function_entry *, PyObject *, PyObject *),
void *data) {
if (name == nullptr)
name = "";
void initialize(function_entry *entry) {
if (entry->name == nullptr)
entry->name = "";
/* Linked list of function call handlers (for overloading) */
function_entry *entry = new function_entry();
entry->impl = impl;
entry->is_constructor = !strcmp(name, "__init__");
entry->policy = policy;
entry->signature = signature;
entry->data = data;
if (doc) entry->doc = doc;
if (!sibling.ptr() || !PyCFunction_Check(sibling.ptr())) {
entry->is_constructor = !strcmp(entry->name, "__init__");
if (!entry->sibling || !PyCFunction_Check(entry->sibling)) {
PyMethodDef *def = new PyMethodDef();
memset(def, 0, sizeof(PyMethodDef));
def->ml_name = name != nullptr ? strdup(name) : name;
def->ml_name = entry->name;
def->ml_meth = reinterpret_cast<PyCFunction>(*dispatcher);
def->ml_flags = METH_VARARGS | METH_KEYWORDS;
capsule entry_capsule(entry);
......@@ -189,7 +238,7 @@ private:
if (!m_ptr)
throw std::runtime_error("cpp_function::cpp_function(): Could not allocate function object");
} else {
m_ptr = sibling.ptr();
m_ptr = entry->sibling;
inc_ref();
capsule entry_capsule(PyCFunction_GetSelf(m_ptr), true);
function_entry *parent = (function_entry *) entry_capsule, *backup = parent;
......@@ -199,22 +248,23 @@ private:
entry = backup;
}
std::string signatures;
int it = 0;
while (entry) { /* Create pydoc entry */
if (sibling.ptr())
signatures += std::to_string(++it) + ". ";
signatures += "Signature : " + std::string(entry->signature) + "\n";
if (!entry->doc.empty())
signatures += "\n" + std::string(entry->doc) + "\n";
if (entry->next)
int index = 0;
function_entry *it = entry;
while (it) { /* Create pydoc it */
if (it->sibling)
signatures += std::to_string(++index) + ". ";
signatures += "Signature : " + std::string(it->signature) + "\n";
if (it->doc && strlen(it->doc) > 0)
signatures += "\n" + std::string(it->doc) + "\n";
if (it->next)
signatures += "\n";
entry = entry->next;
it = it->next;
}
PyCFunctionObject *func = (PyCFunctionObject *) m_ptr;
if (func->m_ml->ml_doc)
std::free((char *) func->m_ml->ml_doc);
func->m_ml->ml_doc = strdup(signatures.c_str());
if (is_method) {
if (entry->is_method) {
m_ptr = PyInstanceMethod_New(m_ptr);
if (!m_ptr)
throw std::runtime_error("cpp_function::cpp_function(): Could not allocate instance method object");
......@@ -223,15 +273,6 @@ private:
}
};
class cpp_method : public cpp_function {
public:
cpp_method () { }
template <typename func> cpp_method(func &&f, const char *name = nullptr,
const char *doc = nullptr, return_value_policy
policy = return_value_policy::automatic, function sibling = function())
: cpp_function(std::forward<func>(f), name, doc, policy, sibling, true) {}
};
class module : public object {
public:
PYBIND_OBJECT_DEFAULT(module, object, PyModule_Check)
......@@ -249,12 +290,12 @@ public:
inc_ref();
}
template <typename Func>
module &def(const char *name, Func f, const char *doc = nullptr,
return_value_policy policy = return_value_policy::automatic) {
cpp_function func(f, name, doc, policy, (function) attr(name));
template <typename Func, typename... Extra>
module &def(const char *name_, Func &&f, Extra&& ... extra) {
cpp_function func(std::forward<Func>(f), name(name_),
sibling((handle) attr(name_)), std::forward<Extra>(extra)...);
func.inc_ref(); /* The following line steals a reference to 'func' */
PyModule_AddObject(ptr(), name, func.ptr());
PyModule_AddObject(ptr(), name_, func.ptr());
return *this;
}
......@@ -270,13 +311,6 @@ public:
};
NAMESPACE_BEGIN(detail)
/* Forward declarations */
enum op_id : int;
enum op_type : int;
struct undefined_t;
template <op_id id, op_type ot, typename L = undefined_t, typename R = undefined_t> struct op_;
template <typename ... Args> struct init;
/// Basic support for creating new Python heap types
class custom_type : public object {
public:
......@@ -435,6 +469,13 @@ protected:
static void releasebuffer(PyObject *, Py_buffer *view) { delete (buffer_info *) view->internal; }
};
/* Forward declarations */
enum op_id : int;
enum op_type : int;
struct undefined_t;
template <op_id id, op_type ot, typename L = undefined_t, typename R = undefined_t> struct op_;
template <typename... Args> struct init;
NAMESPACE_END(detail)
template <typename type, typename holder_type = std::unique_ptr<type>> class class_ : public detail::custom_type {
......@@ -454,42 +495,41 @@ public:
sizeof(instance_type), init_holder, dealloc,
parent.ptr(), doc) { }
template <typename Func>
class_ &def(const char *name, Func f, const char *doc = nullptr,
return_value_policy policy = return_value_policy::automatic) {
attr(name) = cpp_method(f, name, doc, policy, (function) attr(name));
template <typename Func, typename... Extra>
class_ &def(const char *name_, Func&& f, Extra&&... extra) {
attr(name_) = cpp_function(std::forward<Func>(f), name(name_),
sibling(attr(name_)), is_method(),
std::forward<Extra>(extra)...);
return *this;
}
template <typename Func> class_ &
def_static(const char *name, Func f, const char *doc = nullptr,
return_value_policy policy = return_value_policy::automatic) {
attr(name) = cpp_function(f, name, doc, policy, (function) attr(name));
template <typename Func, typename... Extra> class_ &
def_static(const char *name_, Func f, Extra&&... extra) {
attr(name_) = cpp_function(std::forward<Func>(f), name(name_),
sibling(attr(name_)),
std::forward<Extra>(extra)...);
return *this;
}
template <detail::op_id id, detail::op_type ot, typename L, typename R>
class_ &def(const detail::op_<id, ot, L, R> &op, const char *doc = nullptr,
return_value_policy policy = return_value_policy::automatic) {
op.template execute<type>(*this, doc, policy);
template <detail::op_id id, detail::op_type ot, typename L, typename R, typename... Extra>
class_ &def(const detail::op_<id, ot, L, R> &op, Extra&&... extra) {
op.template execute<type>(*this, std::forward<Extra>(extra)...);
return *this;
}
template <detail::op_id id, detail::op_type ot, typename L, typename R> class_ &
def_cast(const detail::op_<id, ot, L, R> &op, const char *doc = nullptr,
return_value_policy policy = return_value_policy::automatic) {
op.template execute_cast<type>(*this, doc, policy);
template <detail::op_id id, detail::op_type ot, typename L, typename R, typename... Extra>
class_ & def_cast(const detail::op_<id, ot, L, R> &op, Extra&&... extra) {
op.template execute_cast<type>(*this, std::forward<Extra>(extra)...);
return *this;
}
template <typename... Args>
class_ &def(const detail::init<Args...> &init, const char *doc = nullptr) {
init.template execute<type>(*this, doc);
template <typename... Args, typename... Extra>
class_ &def(const detail::init<Args...> &init, Extra&&... extra) {
init.template execute<type>(*this, std::forward<Extra>(extra)...);
return *this;
}
template <typename Func>
class_& def_buffer(Func &&func) {
template <typename Func> class_& def_buffer(Func &&func) {
struct capture { Func func; };
capture *ptr = new capture { std::forward<Func>(func) };
install_buffer_funcs([](PyObject *obj, void *ptr) -> buffer_info* {
......@@ -501,73 +541,69 @@ public:
return *this;
}
template <typename C, typename D>
class_ &def_readwrite(const char *name, D C::*pm,
const char *doc = nullptr) {
cpp_method fget([pm](const C &c) -> const D &{ return c.*pm; }, nullptr,
nullptr, return_value_policy::reference_internal),
fset([pm](C &c, const D &value) { c.*pm = value; });
def_property(name, fget, fset, doc);
template <typename C, typename D, typename... Extra>
class_ &def_readwrite(const char *name, D C::*pm, Extra&&... extra) {
cpp_function fget([pm](const C &c) -> const D &{ return c.*pm; },
return_value_policy::reference_internal,
is_method(), extra...),
fset([pm](C &c, const D &value) { c.*pm = value; },
is_method(), extra...);
def_property(name, fget, fset);
return *this;
}
template <typename C, typename D>
class_ &def_readonly(const char *name, const D C::*pm,
const char *doc = nullptr) {
cpp_method fget([pm](const C &c) -> const D &{ return c.*pm; }, nullptr,
nullptr, return_value_policy::reference_internal);
def_property(name, fget, doc);
template <typename C, typename D, typename... Extra>
class_ &def_readonly(const char *name, const D C::*pm, Extra&& ...extra) {
cpp_function fget([pm](const C &c) -> const D &{ return c.*pm; },
return_value_policy::reference_internal,
is_method(), std::forward<Extra>(extra)...);
def_property_readonly(name, fget);
return *this;
}
template <typename D>
class_ &def_readwrite_static(const char *name, D *pm,
const char *doc = nullptr) {
template <typename D, typename... Extra>
class_ &def_readwrite_static(const char *name, D *pm, Extra&& ...extra) {
cpp_function fget([pm](object) -> const D &{ return *pm; }, nullptr,
nullptr, return_value_policy::reference_internal),
fset([pm](object, const D &value) { *pm = value; });
def_property_static(name, fget, fset, doc);
return_value_policy::reference_internal, extra...),
fset([pm](object, const D &value) { *pm = value; }, extra...);
def_property_static(name, fget, fset);
return *this;
}
template <typename D>
class_ &def_readonly_static(const char *name, const D *pm,
const char *doc = nullptr) {
template <typename D, typename... Extra>
class_ &def_readonly_static(const char *name, const D *pm, Extra&& ...extra) {
cpp_function fget([pm](object) -> const D &{ return *pm; }, nullptr,
nullptr, return_value_policy::reference_internal);
def_property_static(name, fget, doc);
return_value_policy::reference_internal, std::forward<Extra>(extra)...);
def_property_readonly_static(name, fget);
return *this;
}
class_ &def_property(const char *name, const cpp_method &fget,
const char *doc = nullptr) {
def_property(name, fget, cpp_method(), doc);
class_ &def_property_readonly(const char *name, const cpp_function &fget) {
def_property(name, fget, cpp_function());
return *this;
}
class_ &def_property_static(const char *name, const cpp_function &fget,
const char *doc = nullptr) {
def_property_static(name, fget, cpp_function(), doc);
class_ &def_property_readonly_static(const char *name, const cpp_function &fget) {
def_property_static(name, fget, cpp_function());
return *this;
}
class_ &def_property(const char *name, const cpp_method &fget,
const cpp_method &fset, const char *doc = nullptr) {
class_ &def_property(const char *name, const cpp_function &fget, const cpp_function &fset) {
object property(
PyObject_CallFunction((PyObject *)&PyProperty_Type,
const_cast<char *>("OOOs"), fget.ptr() ? fget.ptr() : Py_None,
fset.ptr() ? fset.ptr() : Py_None, Py_None, doc), false);
const_cast<char *>("OOOO"), fget.ptr() ? fget.ptr() : Py_None,
fset.ptr() ? fset.ptr() : Py_None, Py_None,
((object) const_cast<cpp_function&>(fget).attr("__doc__")).ptr()), false);
attr(name) = property;
return *this;
}
class_ &def_property_static(const char *name, const cpp_function &fget,
const cpp_function &fset,
const char *doc = nullptr) {
class_ &def_property_static(const char *name, const cpp_function &fget, const cpp_function &fset) {
object property(
PyObject_CallFunction((PyObject *)&PyProperty_Type,
const_cast<char *>("OOOs"), fget.ptr() ? fget.ptr() : Py_None,
fset.ptr() ? fset.ptr() : Py_None, Py_None, doc), false);
const_cast<char *>("OOOO"), fget.ptr() ? fget.ptr() : Py_None,
fset.ptr() ? fset.ptr() : Py_None, Py_None,
((object) const_cast<cpp_function&>(fget).attr("__doc__")).ptr()), false);
metaclass().attr(name) = property;
return *this;
}
......@@ -626,10 +662,10 @@ private:
};
NAMESPACE_BEGIN(detail)
template <typename ... Args> struct init {
template <typename Base, typename Holder> void execute(pybind::class_<Base, Holder> &class_, const char *doc) const {
template <typename... Args> struct init {
template <typename Base, typename Holder, typename... Extra> void execute(pybind::class_<Base, Holder> &class_, Extra&&... extra) const {
/// Function which calls a specific C++ in-place constructor
class_.def("__init__", [](Base *instance, Args... args) { new (instance) Base(args...); }, doc);
class_.def("__init__", [](Base *instance, Args... args) { new (instance) Base(args...); }, std::forward<Extra>(extra)...);
}
};
NAMESPACE_END(detail)
......
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