在C＃中使用C ++代码获取对象功能

I have have a function in wrote in C++ that calls some functions in a old lib. This function creates some memory makes the calls and destroys the memory. To optimize this I would create an object that would keep the memory allocated until the object was destroyed. However I'm going to be calling this function from C# and don't believe I can export a Class, just functions or variables.I have have a function in wrote in C++ that cal