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@sje: No it cannot be used within a standard container. Read the standard, specifically 20.1.3. For C to be used within a standard container, C(x) has to be equal to x. That is, a C copy-constructed with x must be identical to x. Your code fails in this regard, and therefore it cannot be used in a standard container. Just because it happens to 'work' on your implementation in this tiny test doesn't make it a viable solution, it's non-standard.
This is a hack. To make it work, you'd need to override operator= and make sure id has nothing to do with two things being identical.–Jul 18 '10 at 17:33. The constructor of these objects is not always called.Yes, it is, but it's not the constructor you think. The member function resize is actually declared like this: void resize(sizetype sz, T c = T);The second parameter is the object to copy into each of the newly inserted elements of the vector.
If you omit the second parameter, it default constructs an object of type T then copies that object into each of the new elements.In your code, a temporary C is constructed and the default constructor is called; id is set to 0. The implicitly declared copy constructor is then called ten times (to insert ten elements into the vector), and all of the elements in the vector have the same id.Note for those who are interested: in C03, the second parameter of resize ( c) is taken by value; in C0x it is taken by const lvalue reference (see ).In this example, am I forced to resize the vector and then initialise its elements 'manually'?You can (and probably should) insert the elements into the vector individually, e.g., std::vector vc;for (unsigned i(0); i.