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shared_state.hh
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shared_state.hh
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#pragma once
namespace experimental
{
namespace impl
{
template<typename T, bool isReference>
struct shared_state_spe{};
template<typename T>
struct shared_state : public shared_state_spe<T, std::is_reference<T>::value> {};
template<typename T>
struct shared_state_spe<T, false>
{
shared_state_spe<T,false>() = default;
shared_state_spe<T,false>(shared_state_spe<T,false> && o) noexcept = delete;
shared_state_spe<T,false>(shared_state_spe<T,false> const& o) noexcept = delete;
shared_state_spe<T,false>& operator=(shared_state_spe<T,false> && o) noexcept = delete;
shared_state_spe<T,false>& operator=(shared_state_spe<T,false> const& o) noexcept = delete;
void wait() const
{
std::unique_lock<std::mutex> l(_m);
_cv.wait(l, [this] () -> bool
{
return _isReady;
});
}
template< class Rep, class Period >
bool wait_for( const std::chrono::duration<Rep,Period>& timeout_duration) const
{
std::unique_lock<std::mutex> l(_m);
return _cv.wait_for(l,
timeout_duration,
[this] () -> bool
{
return _isReady;
});
}
template< class Clock, class Duration >
bool wait_until( const std::chrono::time_point<Clock,Duration>& timeout_time ) const
{
std::unique_lock<std::mutex> l(_m);
return _cv.wait_until(l,
timeout_time,
[this] () -> bool
{
return _isReady;
});
}
bool isReady() const
{
return _isReady;
}
void set_value(T &&t)
{
std::unique_lock<std::mutex> l(_m_thens);
{
std::unique_lock<std::mutex> l(_m);
_isReady = true;
std::swap(_state, t);
}
_cv.notify_all();
if (!_thens.empty()) {
for(auto &then : _thens) {
then(_state, nullptr);
}
}
}
void set_exception(std::exception_ptr p)
{
std::unique_lock<std::mutex> l(_m_thens);
{
std::unique_lock<std::mutex> l(_m);
_isReady = true;
_error = p;
}
if (!_thens.empty()) {
char dummy[sizeof(T)];
for(auto &then : _thens) {
then(*reinterpret_cast<T*>(dummy), std::move(p));
}
}
_cv.notify_all();
}
T get_value()
{
if(_error) {
std::rethrow_exception(_error);
}
return std::move(_state);
}
void set_then(std::function<void(const T&, std::exception_ptr)> f)
{
std::unique_lock<std::mutex> l(_m_thens);
if(_isReady) {
f(_state, _error);
}
_thens.push_back(std::move(f));
}
private:
mutable std::condition_variable _cv;
T _state;
std::exception_ptr _error;
bool _isReady = false;
mutable std::mutex _m, _m_thens;
std::list<std::function<void(T const&, std::exception_ptr)>> _thens;
};
template<typename T>
struct shared_state_spe<T, true>
{
using ref_type = T;
using value_type = typename std::remove_reference<T>::type;
shared_state_spe<T,true>() = default;
shared_state_spe<T,true>(shared_state_spe<T,true> && o) noexcept = delete;
shared_state_spe<T,true>(shared_state_spe<T,true> const& o) noexcept = delete;
shared_state_spe<T,true>& operator=(shared_state_spe<T,true> && o) noexcept = delete;
shared_state_spe<T,true>& operator=(shared_state_spe<T,true> const& o) noexcept = delete;
void wait() const
{
std::unique_lock<std::mutex> l(_m);
_cv.wait(l, [this] () -> bool
{
return _isReady;
});
}
template< class Rep, class Period >
bool wait_for( const std::chrono::duration<Rep,Period>& timeout_duration) const
{
std::unique_lock<std::mutex> l(_m);
return _cv.wait_for(l,
timeout_duration,
[this] () -> bool
{
return _isReady;
});
}
template< class Clock, class Duration >
bool wait_until( const std::chrono::time_point<Clock,Duration>& timeout_time ) const
{
std::unique_lock<std::mutex> l(_m);
return _cv.wait_until(l,
timeout_time,
[this] () -> bool
{
return _isReady;
});
}
bool isReady() const
{
return _isReady;
}
void set_value(value_type &t)
{
std::unique_lock<std::mutex> l(_m_thens);
{
std::unique_lock<std::mutex> l(_m);
_isReady = true;
_state = &t;
}
_cv.notify_all();
if (!_thens.empty()) {
for(auto &then : _thens) {
then(*_state, nullptr);
}
}
}
void set_exception(std::exception_ptr p)
{
std::unique_lock<std::mutex> l(_m_thens);
{
std::unique_lock<std::mutex> l(_m);
_isReady = true;
_error = p;
}
if (!_thens.empty()) {
char dummy[sizeof(value_type)];
for(auto &then : _thens) {
then(*reinterpret_cast<value_type*>(dummy), std::move(p));
}
}
_cv.notify_all();
}
value_type& get_value()
{
if(_error) {
std::rethrow_exception(_error);
}
return *_state;
}
void set_then(std::function<void(value_type &, std::exception_ptr)> f)
{
std::unique_lock<std::mutex> l(_m_thens);
if(_isReady) {
if(_error) {
char dummy[sizeof(value_type)];
f(*reinterpret_cast<value_type*>(dummy), _error);
} else{
f(*_state, nullptr);
}
}
_thens.emplace_back(std::move(f));
}
private:
mutable std::condition_variable _cv;
value_type *_state=nullptr;
std::exception_ptr _error;
bool _isReady = false;
mutable std::mutex _m, _m_thens;
std::list<std::function<void(value_type &, std::exception_ptr)>> _thens;
};
template<>
struct shared_state_spe<void, false>
{
shared_state_spe<void,false>() = default;
shared_state_spe<void,false>(shared_state_spe<void,false> && o) noexcept = delete;
shared_state_spe<void,false>(shared_state_spe<void,false> const& o) noexcept = delete;
shared_state_spe<void,false>& operator=(shared_state_spe<void,false> && o) noexcept = delete;
shared_state_spe<void,false>& operator=(shared_state_spe<void,false> const& o) noexcept = delete;
void wait() const
{
std::unique_lock<std::mutex> l(_m);
return _cv.wait(l, [this] () -> bool
{
return _isReady;
});
}
template< class Rep, class Period >
bool wait_for( const std::chrono::duration<Rep,Period>& timeout_duration) const
{
std::unique_lock<std::mutex> l(_m);
return _cv.wait_for(l,
timeout_duration,
[this] () -> bool
{
return _isReady;
});
}
template< class Clock, class Duration >
bool wait_until( const std::chrono::time_point<Clock,Duration>& timeout_time ) const
{
std::unique_lock<std::mutex> l(_m);
return _cv.wait_until(l, timeout_time,
[this] () -> bool
{
return _isReady;
});
}
bool isReady() const
{
return _isReady;
}
void set_value()
{
std::unique_lock<std::mutex> l(_m_thens);
{
std::unique_lock<std::mutex> l(_m);
_isReady = true;
}
_cv.notify_all();
if (!_thens.empty()) {
for(auto &then : _thens) {
then(nullptr);
}
}
}
void set_exception(std::exception_ptr p)
{
std::unique_lock<std::mutex> l(_m_thens);
{
std::unique_lock<std::mutex> l(_m);
_isReady = true;
_error = p;
}
if (!_thens.empty()) {
for(auto &then : _thens) {
then(std::move(p));
}
}
_cv.notify_all();
}
void get_value()
{
if(_error) {
std::rethrow_exception(_error);
}
return;
}
void set_then(std::function<void(std::exception_ptr)> f)
{
std::unique_lock<std::mutex> l(_m_thens);
if(_isReady) {
f(_error);
}
_thens.emplace_back(std::move(f));
}
private:
mutable std::condition_variable _cv;
std::exception_ptr _error;
bool _isReady = false;
mutable std::mutex _m, _m_thens;
std::list<std::function<void(std::exception_ptr)>> _thens;
};
}//!impl
}//!experimental