Created
May 17, 2015 23:59
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| 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); | |
| } |
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