C++ multiple inheritance - diamond with templates -

i've got problem when inheriting multiple instances of template.

my class bridge tries inherit 2 instances of bridgetemplate, when try call bridgetemplate's 'set' function, compiler rises error ("ambiguous..."). however, works ok if bridge inherits 1 instance.

below, piece of code both template , class bridge. in advance

template <class datatype, class datawriter> class bridgetemplate : public bridgegeneric {     public:         void set(datatype a, datawriter b)         {             std::cout << "a: " << << "; b: " << b << std::endl;         } ... };  class bridge : public virtual bridgetemplate<int,float>, public virtual bridgetemplate<float,int> { ... } 

argument types not matter.

the error message applies name lookup, not overload resolution. overloaded functions must come same class or namespace. in order insure that, use pattern:

 class child : public dad, public mom {      using dad::func;      using mom::func;  };   // ...   child c;  c.foo(1, 2.3); 

because of using declarations, both func members brought child namespace , lookup no longer ambiguous.