C++/C++11 Efficient way to have static array/vector of objects initialized with initializer list, and supporting range-based for

Question

Suppose you want to have a static array of pre-defined values/objects (const or non-const) associated with a class. Possible options are to use std:vector,

Answer 1

I personally like your constexpr static int my_array[] = {MyClass{1, 2, 3}, MyClass{1, 2, 3}}; I don't think you should shy away from that if a C-style array meets your needs.

If you really want to use std::vector though you could use static const std::vector vec_pre;. So your .cpp file would have this at the top:

namespace{
    MyClass A{1, 2, 3}, B{1, 2, 3}, C{1, 2, 3};
}
const std::vector MyClass::vec_pre{&A, &B, &C};

EDIT after DarkMatter's comments:

After reading your comments, it looks like there could be some maintainability hazard to my method. It could still be accomplished like this in your .cpp:

namespace{
    MyClass temp[]{MyClass{1, 2, 3}, MyClass{1, 2, 3}, MyClass{1, 2, 3}};
    const MyClass* pTemp[]{&temp[0], &temp[1], &temp[2]};
}
const std::vector MyClass::vec_pre{begin(pTemp), end{pTemp}};

You could also remove the duplication of entry maintainability problem by creating a macro to do that for you.