Created
May 17, 2015 23:59
-
-
Save athre0z/39193df1dd633ebb7f61 to your computer and use it in GitHub Desktop.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
template<typename WrapperT, typename WrappedT> | |
struct Proxy { | |
virtual WrappedT& valueRef() = 0; | |
virtual const WrappedT& valueCRef() const = 0; | |
virtual ~Proxy() = default; | |
}; | |
template<typename WrapperT, typename WrappedT> | |
struct Add { | |
template<typename RhsT> | |
friend auto operator + (const Proxy<WrapperT, WrappedT>& lhs, const RhsT& rhs) | |
-> decltype(lhs.valueCRef() + rhs) { | |
return lhs.valueCRef() + rhs; | |
} | |
}; | |
template<typename T> | |
struct Wrapper | |
: Proxy<Wrapper<T>, T> | |
, Add<Wrapper<T>, T> { | |
T& valueRef() override { return val; } | |
const T& valueCRef() const override { return val; } | |
operator T& () { return valueRef(); } | |
operator const T& () const { return valueCRef(); } | |
private: | |
T val; | |
}; | |
int main() { | |
Wrapper<int> a; | |
(void)(a + a); | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment