d中绑定c++常

//main.d :
extern(C++) class A{}
extern(C++) void 中间(A arg);
void main(){
	A a = new A();
	中间(a);
}
//cppShim.cpp :
class A{};
extern void cppFunc(A const &arg);
void 中间(A *param){//
	const A forwardingVar = A(*param);
	cppFunc(forwardingVar);
}//转发了.

//cppFunc.cpp :
#include "iostream"
class A{};
void cppFunc(A const &arg){
	//std::cout << arg << std::endl;
	std::cout << "调用c++函数:D" << std::endl;
}	

命令行传递以下内容(假定在同一目录中):

dmd2 main.d cppFunc.o cppShim.o -L-lstdc++