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Message: [QUOTE="BobR, post: 2991072"] JohnQ wrote in message... struct MyRect2{ // test compiler supplied default Ctor long x, y; MyRect2( long x1, long y1 ): x(x1), y(y1){} // MyRect2( long x1=0, long y1=0 ): x(x1), y(y1){} // no error // (only (un-)comment one at a time)(or comment both to test) }; MyRect2 Rect2; // error: no matching function for call to `MyRect2::MyRect2()' // error: candidates are: MyRect2::MyRect2(const MyRect2&) // : MyRect2::MyRect2(long int, long int) MyRect2 Rect2a(1,2); // ok (either Ctor shown ) So, that shows you that once *you* declare/define anything that can be taken as a constructor, the compiler will *not* supply one. Try it, experiment. [/QUOTE]