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/*
* Copyright (c) 2018 ARM Limited.
*
* SPDX-License-Identifier: MIT
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef __ARM_COMPUTE_MISC_SIGNAL_H__
#define __ARM_COMPUTE_MISC_SIGNAL_H__
#include <functional>
namespace arm_compute
{
namespace utils
{
namespace signal
{
namespace detail
{
/** Base signal class */
template <typename SignalType>
class SignalImpl;
/** Signal class function specialization */
template <typename ReturnType, typename... Args>
class SignalImpl<ReturnType(Args...)>
{
public:
using Callback = std::function<ReturnType(Args...)>;
public:
/** Default Constructor */
SignalImpl() = default;
/** Connects signal
*
* @param[in] cb Callback to connect the signal with
*/
void connect(const Callback &cb)
{
_cb = cb;
}
/** Disconnects the signal */
void disconnect()
{
_cb = nullptr;
}
/** Checks if the signal is connected
*
* @return True if there is a connection else false
*/
bool connected() const
{
return (_cb != nullptr);
}
/** Calls the connected callback
*
* @param[in] args Callback arguments
*/
void operator()(Args &&... args)
{
if(_cb)
{
_cb(std::forward<Args>(args)...);
}
}
private:
Callback _cb{}; /**< Signal callback */
};
} // namespace detail
/** Signal alias */
template <class T>
using Signal = detail::SignalImpl<T>;
} // namespace signal
} // namespace utils
} // namespace arm_compute
#endif /* __ARM_COMPUTE_MISC_SIGNAL_H__ */
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