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Message: [QUOTE="Szabolcs, post: 2924062"] Consider the attached example. When I try to compile it (with g++ 4.1.2), I get the error message error: no matching function for call to 'fun(A<int>&)' However, if I do not use templates, it compiles without errors. Could someone please explain why this happens? Is there a workaround? ------------->8--------------- // With A and B templates template<typename T> struct B { }; template<typename T> struct A { operator B<T> () { return B<T>(); } }; template<typename T> void fun(B<T> b) { } int main() { A<int> a; fun(a); return 0; } ------------->8--------------- // Without templates struct B { }; struct A { operator B() { return B(); } }; void fun(B b) { } int main() { A a; fun(a); return 0; } [/QUOTE]