nerdcruft/libcruft-util
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signal: simplify unneeded signal elements

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* use function syntax for template type
* remove non-scoped cookie
* simplify many type names
This commit is contained in:
Danny Robson 2015-02-18 02:34:10 +11:00
parent 8e5bd17974
commit 38d3fc1961
4 changed files with 152 additions and 104 deletions
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2
signal.cpp
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@ -21,4 +21,4 @@
#include "signal.hpp"
// Instance something probably useful here so that we generate early compile/link errors.
template class util::signal <void>;
template class util::signal <void(void)>;

48
signal.hpp
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@ -14,52 +14,36 @@
* You should have received a copy of the GNU General Public License
* along with libgim. If not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2011-2013 Danny Robson <danny@nerdcruft.net>
* Copyright 2011-2015 Danny Robson <danny@nerdcruft.net>
*/
#ifndef __UTIL_SIGNAL_HPP
#define __UTIL_SIGNAL_HPP
#include "debug.hpp"
#include "nocopy.hpp"
#include <algorithm>
#include <list>
#include <functional>
#include <list>
#include <type_traits>
namespace util {
template <typename Ret, typename ...Args>
template <typename F>
class signal {
public:
//typedef Ret (*callback_function)(Args...);
typedef std::function<Ret(Args...)> callback_object;
using R = std::result_of<F>;
using callback = std::function<F>;
protected:
typedef std::list<callback_object> group;
group m_children;
public:
typedef typename group::iterator cookie;
struct scoped_cookie : public nocopy {
cookie m_cookie;
signal<Ret, Args...>& m_parent;
scoped_cookie (cookie _cookie, signal<Ret, Args...> &_parent);
scoped_cookie (scoped_cookie &&rhs);
~scoped_cookie ();
void renew (callback_object &&cb);
void release (void);
};
struct cookie;
public:
signal ();
~signal ();
/// Add a callback to list.
cookie connect (const callback_object &_cb);
scoped_cookie scoped_connect (const callback_object &_cb);
cookie connect (const callback&);
void disconnect (const cookie&);
void disconnect (const cookie _cb);
/// Disconnect all callbacks
void clear (void);
@ -67,8 +51,14 @@ namespace util {
unsigned int size (void) const;
bool empty (void) const;
/// Execute all callbacks, ignoring the return parameters. Does not combine results.
void operator () (Args... tail);
/// Execute all callbacks, ignoring the return parameters. Does
/// not combine results.
template <typename ...Args>
void operator () (Args&&... tail);
private:
typedef std::list<callback> group;
group m_children;
};
}

149
signal.ipp
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@ -14,102 +14,144 @@
* You should have received a copy of the GNU General Public License
* along with libgim. If not, see <http://www.gnu.org/licenses/>.
*
* Copyright 2011-2013 Danny Robson <danny@nerdcruft.net>
* Copyright 2011-2015 Danny Robson <danny@nerdcruft.net>
*/
#ifndef __UTIL_SIGNAL_HPP
#error
#endif
#include "debug.hpp"
#include <algorithm>
namespace util {
template <typename Ret, typename ...Args>
signal<Ret, Args...>::scoped_cookie::scoped_cookie (cookie _cookie,
signal<Ret, Args...> &_parent):
m_cookie (_cookie),
///////////////////////////////////////////////////////////////////////////
template <typename F>
struct signal<F>::cookie : public nocopy {
cookie (typename group::iterator, signal<F> &parent);
cookie (cookie &&rhs);
~cookie ();
void reset (callback &&cb);
void reset (void);
typename group::iterator m_position;
signal<F> &m_parent;
};
///////////////////////////////////////////////////////////////////////////
template <typename F>
signal<F>::cookie::cookie (typename group::iterator _position,
signal<F> &_parent):
m_position (_position),
m_parent (_parent)
{ ; }
template <typename Ret, typename ...Args>
signal<Ret, Args...>::scoped_cookie::scoped_cookie (scoped_cookie &&rhs):
m_cookie (rhs.m_cookie),
//-------------------------------------------------------------------------
template <typename F>
signal<F>::cookie::cookie (cookie &&rhs):
m_position (rhs.m_position),
m_parent (rhs.m_parent)
{
rhs.m_cookie = rhs.m_parent.m_children.end ();
rhs.m_position = rhs.m_parent.m_children.end ();
}
template <typename Ret, typename ...Args>
signal<Ret, Args...>::scoped_cookie::~scoped_cookie () {
if (m_parent.m_children.end () != m_cookie)
m_parent.disconnect (m_cookie);
//-------------------------------------------------------------------------
template <typename F>
signal<F>::cookie::~cookie ()
{
if (m_parent.m_children.end () != m_position)
m_parent.disconnect (*this);
}
template <typename Ret, typename ...Args>
///////////////////////////////////////////////////////////////////////////
template <typename F>
void
signal<Ret, Args...>::scoped_cookie::renew (callback_object &&cb)
{ *m_cookie = std::move (cb); }
signal<F>::cookie::reset (callback &&cb)
{
*m_position = std::move (cb);
}
template <typename Ret, typename ...Args>
//-------------------------------------------------------------------------
template <typename F>
void
signal<Ret, Args...>::scoped_cookie::release (void)
{ m_cookie = m_parent.m_children.end (); }
signal<F>::cookie::reset (void)
{
m_position = m_parent.m_children.end ();
}
template <typename Ret, typename ...Args>
signal<Ret, Args...>::signal ()
///////////////////////////////////////////////////////////////////////////
template <typename F>
signal<F>::signal ()
{ ; }
template <typename Ret, typename ...Args>
typename signal<Ret, Args...>::cookie
signal<Ret, Args...>::connect (const callback_object &_cb)
{ return m_children.insert (m_children.end (), _cb); }
//-------------------------------------------------------------------------
template <typename F>
signal<F>::~signal ()
{
CHECK (empty ());
}
///////////////////////////////////////////////////////////////////////////
template <typename F>
typename signal<F>::cookie
signal<F>::connect (const callback &_cb)
{
return cookie (m_children.insert (m_children.end (), _cb), *this);
}
template <typename Ret, typename ...Args>
typename signal<Ret, Args...>::scoped_cookie
signal<Ret, Args...>::scoped_connect (const callback_object &_cb)
{ return scoped_cookie (connect (_cb), *this); }
/// Add a callback to the list.
//const cookie
//connect (const callback_function &_cb)
// { return m_children.insert (m_children.end (), _cb); }
template <typename Ret, typename ...Args>
//-------------------------------------------------------------------------
template <typename F>
void
signal<Ret, Args...>::disconnect (const cookie _cb)
{ m_children.erase (_cb); }
signal<F>::disconnect (const cookie &c)
{
m_children.erase (c.m_position);
}
//-------------------------------------------------------------------------
/// Disconnect all callbacks
template <typename Ret, typename ...Args>
template <typename F>
void
signal<Ret, Args...>::clear (void)
{ m_children.clear (); }
signal<F>::clear (void)
{
m_children.clear ();
}
///////////////////////////////////////////////////////////////////////////
/// Returns the number of callbacks connected.
template <typename Ret, typename ...Args>
template <typename F>
unsigned int
signal<Ret, Args...>::size (void) const
{ return m_children.size (); }
signal<F>::size (void) const
{
return m_children.size ();
}
template <typename Ret, typename ...Args>
//-------------------------------------------------------------------------
template <typename F>
bool
signal<Ret, Args...>::empty (void) const
{ return m_children.empty (); }
signal<F>::empty (void) const
{
return m_children.empty ();
}
template <typename Ret, typename ...Args>
///////////////////////////////////////////////////////////////////////////
template <typename F>
template <typename ...Args>
void
signal<Ret, Args...>::operator () (Args... tail) {
signal<F>::operator () (Args&&... tail) {
if (m_children.empty ())
return;
@ -117,11 +159,12 @@ namespace util {
bool looping;
do {
// Increment before we execute so that the caller is able to deregister during execution.
// Increment before we execute so that the caller is able to
// deregister during execution.
auto current = i++;
looping = m_children.cend () != i;
(*current)(tail...);
(*current)(std::forward<Args> (tail)...);
} while (looping);
}
}

57
test/signal.cpp
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@ -1,54 +1,69 @@
#include <cstdlib>
#include "../signal.hpp"
#include "../debug.hpp"
#include "signal.hpp"
#include "debug.hpp"
#include "raii.hpp"
//-----------------------------------------------------------------------------
void
increment_uint (unsigned int &val)
{ ++val; }
void
test_null (void) {
util::signal<void> void_signal;
test_null (void)
{
util::signal<void(void)> void_signal;
void_signal ();
}
///////////////////////////////////////////////////////////////////////////////
void
test_single (void) {
unsigned int val = 0;
util::signal<void, unsigned int&> void_signal;
increment_uint (unsigned int &val)
{
++val;
}
void_signal.connect (increment_uint);
//-----------------------------------------------------------------------------
void
test_single (void)
{
unsigned int val = 0;
util::signal<void(unsigned int&)> void_signal;
auto raii = void_signal.connect (increment_uint);
void_signal (val);
CHECK_EQ (val, 1);
}
//-----------------------------------------------------------------------------
void
test_double (void) {
test_double (void)
{
unsigned int val = 0;
util::signal<void, unsigned int&> void_signal;
util::signal<void(unsigned int&)> void_signal;
void_signal.connect (increment_uint);
void_signal.connect (increment_uint);
auto raii = void_signal.connect (increment_uint);
auto raii = void_signal.connect (increment_uint);
void_signal (val);
CHECK_EQ (val, 2);
}
///////////////////////////////////////////////////////////////////////////////
void
test_linking_pointers (void) {
util::signal<void, const char*> ptr_signal;
ptr_signal (NULL);
test_linking_pointers (void)
{
util::signal<void(const char*)> ptr_signal;
ptr_signal (nullptr);
}
///////////////////////////////////////////////////////////////////////////////
int
main (int, char **) {
main (int, char **)
{
test_null ();
test_single ();
test_double ();