52 lines
1.0 KiB
C++
52 lines
1.0 KiB
C++
#include <memory>
|
|
|
|
|
|
|
|
template <typename Fun>
|
|
class Function;
|
|
|
|
|
|
template <typename Ret, typename... Args>
|
|
class Function<Ret(Args...)>
|
|
{
|
|
private:
|
|
class callable_base
|
|
{
|
|
public:
|
|
virtual Ret call(Args...) = 0;
|
|
virtual ~callable_base() {}
|
|
//virtual ~callable_base() = default; // melyik számít szebbnek? van bármi különbség?
|
|
};
|
|
|
|
template <typename Fun>
|
|
class callable : public callable_base
|
|
{
|
|
private:
|
|
Fun _fun;
|
|
public:
|
|
callable(Fun fun):_fun(fun) {}
|
|
|
|
virtual Ret call(Args... args) override
|
|
{ return _fun(std::forward<Args>(args)...); }
|
|
|
|
virtual ~callable() override {}
|
|
};
|
|
|
|
std::unique_ptr _fun;
|
|
|
|
public:
|
|
Function() {}
|
|
|
|
template <typename Fun>
|
|
Function& operator=(Fun fun)
|
|
{
|
|
_fun = std::make_unique<callable<Fun>>(fun);
|
|
return *this;
|
|
}
|
|
|
|
Ret operator()(Args... args) const
|
|
{ return _fun->call(std::forward<Args>(args)...); }
|
|
|
|
operator bool() const
|
|
{ return static_cast<bool>(_fun); }
|
|
}; |