make storage for args/result a standalone object

master
Daniel Kolesa 2017-03-17 00:24:00 +01:00
parent 23493c49af
commit 58a11a3415
1 changed files with 114 additions and 122 deletions

View File

@ -27,6 +27,9 @@ template<typename T>
struct coroutine;
namespace detail {
template<typename T>
using coro_arg = std::add_pointer_t<std::remove_reference_t<T>>;
/* dealing with args */
template<typename ...A>
struct coro_types {
@ -34,13 +37,12 @@ namespace detail {
template<size_t ...I>
static yield_type get_impl(
std::tuple<std::add_pointer_t<A>...> &args,
std::index_sequence<I...>
std::tuple<coro_arg<A>...> &args, std::index_sequence<I...>
) {
return std::make_tuple(std::forward<A>(*std::get<I>(args))...);
}
static yield_type get(std::tuple<std::add_pointer_t<A>...> &args) {
static yield_type get(std::tuple<coro_arg<A>...> &args) {
return get_impl(args, std::index_sequence_for<A...>{});
}
};
@ -49,7 +51,7 @@ namespace detail {
struct coro_types<A> {
using yield_type = A;
static yield_type get(std::tuple<std::add_pointer_t<A>> &args) {
static yield_type get(std::tuple<coro_arg<A>> &args) {
return std::forward<A>(*std::get<0>(args));
}
};
@ -58,9 +60,7 @@ namespace detail {
struct coro_types<A, B> {
using yield_type = std::pair<A, B>;
static yield_type get(
std::tuple<std::add_pointer_t<A>, std::add_pointer_t<B>> &args
) {
static yield_type get(std::tuple<coro_arg<A>, coro_arg<B>> &args) {
return std::make_pair(
std::forward<A>(*std::get<0>(args)),
std::forward<B>(*std::get<1>(args))
@ -132,22 +132,15 @@ namespace detail {
template<typename R>
using coro_result = typename coro_rtype<R>::type;
/* forward declare generic yielder for friends */
template<typename R, typename ...A>
struct coro_yielder;
/* default case, yield returns args and takes a value */
template<typename R, typename ...A>
struct coro_base: coroutine_context {
protected:
friend struct coro_yielder<R, A...>;
struct coro_stor {
template<size_t ...I>
coro_args<A...> get_args(std::index_sequence<I...>) {
return coro_types<A...>::get(p_args);
}
void set_args(std::add_pointer_t<A> ...args) {
void set_args(coro_arg<A> ...args) {
p_args = std::make_tuple(args...);
}
@ -156,31 +149,28 @@ namespace detail {
}
template<typename Y, typename F, size_t ...I>
void call_helper(F &func, std::index_sequence<I...>) {
void call_helper(F &func, Y &&yielder, std::index_sequence<I...>) {
coro_rtype<R>::store(p_result, std::forward<R>(func(
Y{*this}, std::forward<A>(*std::get<I>(p_args))...
std::forward<Y>(yielder),
std::forward<A>(*std::get<I>(p_args))...
)));
}
void swap(coro_base &other) {
void swap(coro_stor &other) {
using std::swap;
swap(p_args, other.p_args);
/* no need to swap result as result is always only alive
* for the time of a single resume, in which no swap happens
*/
coroutine_context::swap(other);
}
std::tuple<std::add_pointer_t<A>...> p_args;
std::tuple<coro_arg<A>...> p_args;
coro_result<R> p_result;
};
/* yield takes a value but doesn't return any args */
template<typename R>
struct coro_base<R>: coroutine_context {
protected:
friend struct coro_yielder<R>;
struct coro_stor<R> {
template<size_t ...I>
void get_args(std::index_sequence<I...>) {}
@ -191,54 +181,50 @@ namespace detail {
}
template<typename Y, typename F, size_t ...I>
void call_helper(F &func, std::index_sequence<I...>) {
coro_rtype<R>::store(p_result, std::forward<R>(func(Y{*this})));
void call_helper(F &func, Y &&yielder, std::index_sequence<I...>) {
coro_rtype<R>::store(
p_result, std::forward<R>(func(std::forward<Y>(yielder)))
);
}
void swap(coro_base &other) {
coroutine_context::swap(other);
}
void swap(coro_stor &) {}
coro_result<R> p_result;
};
/* yield doesn't take a value and returns args */
template<typename ...A>
struct coro_base<void, A...>: coroutine_context {
protected:
friend struct coro_yielder<void, A...>;
struct coro_stor<void, A...> {
template<size_t ...I>
coro_args<A...> get_args(std::index_sequence<I...>) {
return coro_types<A...>::get(p_args);
}
void set_args(std::add_pointer_t<A> ...args) {
void set_args(coro_arg<A> ...args) {
p_args = std::make_tuple(args...);
}
void get_result() {}
template<typename Y, typename F, size_t ...I>
void call_helper(F &func, std::index_sequence<I...>) {
func(Y{*this}, std::forward<A>(*std::get<I>(p_args))...);
void call_helper(F &func, Y &&yielder, std::index_sequence<I...>) {
func(
std::forward<Y>(yielder),
std::forward<A>(*std::get<I>(p_args))...
);
}
void swap(coro_base &other) {
void swap(coro_stor &other) {
using std::swap;
swap(p_args, other.p_args);
coroutine_context::swap(other);
}
std::tuple<std::add_pointer_t<A>...> p_args;
std::tuple<coro_arg<A>...> p_args;
};
/* yield doesn't take a value or return any args */
template<>
struct coro_base<void>: coroutine_context {
protected:
friend struct coro_yielder<void>;
struct coro_stor<void> {
template<size_t ...I>
void get_args(std::index_sequence<I...>) {}
@ -247,86 +233,88 @@ namespace detail {
void get_result() {}
template<typename Y, typename F, size_t ...I>
void call_helper(F &func, std::index_sequence<I...>) {
func(Y{*this});
void call_helper(F &func, Y &&yielder, std::index_sequence<I...>) {
func(std::forward<Y>(yielder));
}
void swap(coro_base &other) {
coroutine_context::swap(other);
}
};
template<typename R, typename ...A>
struct coro_yielder {
coro_yielder(coro_base<R, A...> &coro): p_coro(coro) {}
coro_args<A...> operator()(R &&ret) {
coro_rtype<R>::store(p_coro.p_result, std::move(ret));
p_coro.yield_jump();
return p_coro.get_args(std::make_index_sequence<sizeof...(A)>{});
}
coro_args<A...> operator()(R const &ret) {
coro_rtype<R>::store(p_coro.p_result, ret);
p_coro.yield_jump();
return p_coro.get_args(std::make_index_sequence<sizeof...(A)>{});
}
private:
coro_base<R, A...> &p_coro;
};
template<typename R, typename ...A>
struct coro_yielder<R &, A...> {
coro_yielder(coro_base<R &, A...> &coro): p_coro(coro) {}
coro_args<A...> operator()(R &ret) {
coro_rtype<R &>::store(p_coro.p_result, ret);
p_coro.yield_jump();
return p_coro.get_args(std::make_index_sequence<sizeof...(A)>{});
}
private:
coro_base<R &, A...> &p_coro;
};
template<typename R, typename ...A>
struct coro_yielder<R &&, A...> {
coro_yielder(coro_base<R &&, A...> &coro): p_coro(coro) {}
coro_args<A...> operator()(R &&ret) {
coro_rtype<R &&>::store(p_coro.p_result, std::move(ret));
p_coro.yield_jump();
return p_coro.get_args(std::make_index_sequence<sizeof...(A)>{});
}
private:
coro_base<R &&, A...> &p_coro;
};
template<typename ...A>
struct coro_yielder<void, A...> {
coro_yielder(coro_base<void, A...> &coro): p_coro(coro) {}
coro_args<A...> operator()() {
p_coro.yield_jump();
return p_coro.get_args(std::make_index_sequence<sizeof...(A)>{});
}
private:
coro_base<void, A...> &p_coro;
void swap(coro_stor &) {}
};
} /* namespace detail */
template<typename R, typename ...A>
struct coroutine<R(A...)>: detail::coro_base<R, A...> {
struct coroutine<R(A...)>: detail::coroutine_context {
private:
using base_t = detail::coro_base<R, A...>;
using base_t = detail::coroutine_context;
/* necessary so that context callback can access privates */
friend struct detail::coroutine_context;
template<typename RR, typename ...AA>
struct yielder {
yielder(coroutine<RR(AA...)> &coro): p_coro(coro) {}
detail::coro_args<AA...> operator()(RR &&ret) {
detail::coro_rtype<RR>::store(
p_coro.p_stor.p_result, std::move(ret)
);
p_coro.yield_jump();
return p_coro.p_stor.get_args(std::index_sequence_for<AA...>{});
}
detail::coro_args<AA...> operator()(RR const &ret) {
detail::coro_rtype<RR>::store(p_coro.p_stor.p_result, ret);
p_coro.yield_jump();
return p_coro.p_stor.get_args(std::index_sequence_for<AA...>{});
}
private:
coroutine<RR(AA...)> &p_coro;
};
template<typename RR, typename ...AA>
struct yielder<RR &, AA...> {
yielder(coroutine<RR &(AA...)> &coro): p_coro(coro) {}
detail::coro_args<AA...> operator()(RR &ret) {
detail::coro_rtype<RR &>::store(p_coro.p_stor.p_result, ret);
p_coro.yield_jump();
return p_coro.p_stor.get_args(std::index_sequence_for<AA...>{});
}
private:
coroutine<RR &(AA...)> &p_coro;
};
template<typename RR, typename ...AA>
struct yielder<RR &&, AA...> {
yielder(coroutine<RR &&(AA...)> &coro): p_coro(coro) {}
detail::coro_args<AA...> operator()(RR &&ret) {
detail::coro_rtype<RR &&>::store(
p_coro.p_stor.p_result, std::move(ret)
);
p_coro.yield_jump();
return p_coro.p_stor.get_args(std::index_sequence_for<AA...>{});
}
private:
coroutine<RR &&(AA...)> &p_coro;
};
template<typename ...AA>
struct yielder<void, AA...> {
yielder(coroutine<void(AA...)> &coro): p_coro(coro) {}
detail::coro_args<AA...> operator()() {
p_coro.yield_jump();
return p_coro.p_stor.get_args(std::index_sequence_for<AA...>{});
}
private:
coroutine<void(AA...)> &p_coro;
};
public:
using yield_type = detail::coro_yielder<R, A...>;
using yield_type = yielder<R, A...>;
/* we have no way to assign a function anyway... */
coroutine() = delete;
@ -334,7 +322,7 @@ public:
/* 0 means default size decided by the stack allocator */
template<typename F, typename SA = default_stack>
coroutine(F func, SA sa = SA{}):
base_t(), p_func(std::move(func))
base_t(), p_stor(), p_func(std::move(func))
{
/* that way there is no context creation/stack allocation */
if (!p_func) {
@ -346,14 +334,15 @@ public:
template<typename SA = default_stack>
coroutine(std::nullptr_t, SA = SA{0}):
base_t(), p_func(nullptr)
base_t(), p_stor(), p_func(nullptr)
{
this->set_dead();
}
coroutine(coroutine const &) = delete;
coroutine(coroutine &&c) noexcept:
base_t(std::move(c)), p_func(std::move(c.p_func))
base_t(std::move(c)),
p_stor(std::move(c.p_stor)), p_func(std::move(c.p_func))
{
c.p_func = nullptr;
}
@ -361,6 +350,7 @@ public:
coroutine &operator=(coroutine const &) = delete;
coroutine &operator=(coroutine &&c) noexcept {
base_t::operator=(std::move(c));
p_stor = std::move(c.p_stor);
p_func = std::move(c.p_func);
c.p_func = nullptr;
}
@ -374,7 +364,7 @@ public:
throw coroutine_error{"dead coroutine"};
}
this->set_args(&args...);
detail::coroutine_context::call();
base_t::call();
return this->get_result();
}
@ -383,23 +373,25 @@ public:
if (this->is_dead()) {
throw coroutine_error{"dead coroutine"};
}
this->set_args(&args...);
detail::coroutine_context::call();
return this->get_result();
p_stor.set_args(&args...);
base_t::call();
return p_stor.get_result();
}
void swap(coroutine &other) noexcept {
p_stor.swap(other.p_stor);
std::swap(p_func, other.p_func);
base_t::swap(other);
}
private:
void resume_call() {
base_t::template call_helper<yield_type>(
p_func, std::index_sequence_for<A...>{}
p_stor.call_helper(
p_func, yield_type{*this}, std::index_sequence_for<A...>{}
);
}
detail::coro_stor<R, A...> p_stor;
std::function<R(yield_type, A...)> p_func;
};