[c++] ISO C++ forbids declaration of _ with no type
 

class C1{

public:

    C1(const C2& c){  //line 14 (works fine if i remove this constructor)

    //...

    }

};



class C2{

public:

    C2(const C1& c){ 

    //...

    }

};

the compiler show me the following error:
prova.cpp:14: error: expected ‘,’ or ‘...’ before ‘&’ token
prova.cpp:14: error: ISO C++ forbids declaration of ‘C2’ with no type

Re: [c++] ISO C++ forbids declaration of _ with no type
 

ISO C++ need you to explicitly mention the datatype after the 'const'.
At the moment of defining C1, C2 is not defined.
Read http://www.parashift.com/c++-faq-lit...html#faq-39.11