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985c397 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 | #pragma once
#include <optional>
namespace fastsignals
{
/**
* This results combiner reduces results collection into last value of this collection.
* In other words, it keeps only result of the last slot call.
*/
template <class T>
class optional_last_value
{
public:
using result_type = std::optional<T>;
template <class TRef>
void operator()(TRef&& value)
{
m_result = std::forward<TRef>(value);
}
result_type get_value() const
{
return m_result;
}
private:
result_type m_result = {};
};
template <>
class optional_last_value<void>
{
public:
using result_type = void;
};
} // namespace fastsignals
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