template<typename T>
class Pack
{
private:
std::function<T()> _Func = nullptr;
public:
Pack()
{
}
Pack(std::function<T()> func)
: _Func(func)
{
}
~Pack()
{
}
operator T()
{
return _Func();
}
};
What I use is operator T, I want to call _Func implicitly but I cannot even do it explicitly. It seems right but actually error C2440 @MSVC. I use it in two ways:
static member of class (succeeded);
member of class (failed)
(I don't know whether it matters or not)
I'm really wondering why it performs in two ways, and more importantly, how I can put it into my class as a non-static member and successfully call the operator T.
Member of the class:
struct test
{
test()
{
p_ = Pack<int>(std::bind(&test::foo, *this));
}
int foo()
{
std::cout << "test::foo" << std::endl;
return 5;
}
Pack<int> p_;
};
int main()
{
test t;
int x = t.p_;
return 0;
}
This works fine on VS 2013 EE.
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