完美转发和dll导出

如何解决完美转发和dll导出

我试图在我的自定义向量类上使用完美转发（在某种意义上模仿 std::vector“emplace_back”）并从它定义的 dll 中导出它。

• repeated_ptr_field.hpp

   template<typename TMessage>
   class RepeatedPtrField
   {
   private:
       std::vector<std::unique_ptr<TMessage>> v_;
  
   public:
       RepeatedPtrField(const RepeatedPtrField& other) = delete;
       RepeatedPtrField& operator=(const RepeatedPtrField& other) = delete;
       RepeatedPtrField();
  
       // Some things...
  
       TMessage* Add()
       {
           // This one is ok so far
           v_.push_back(std::make_unique<TMessage>());
           return v_.back().get();
       }
  
       template <typename ...Args>
       TMessage* Add(Args&& ...args)
       {
           // This one is giving me headaches
           v_.push_back(std::make_unique<TMessage>(std::forward<Args>(args)...));
           return v_.back().get();
       }
  
       // Some other things...
   };
  

• repeated_ptr_field.cpp

   template __declspec(dllexport) Value* RepeatedPtrField<Value>::Add(double&&,Currency&&,long&&);
  

• value.hpp

   class Value : public Message
   {
       // Some things...
  
   public:
       // Both constructors defined in .cpp
       __declspec(dllexport) Value();
       __declspec(dllexport) Value(double value,Currency ccy,long timestamp); // This is the constructor that should be used by the Add(args...) method.
  
       // Some other things...
   };
  

我收到编译器错误：'Value::Value'：没有重载函数需要 3 个参数