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

Here is a way to set up the vector without copies or moves.

It doesn't use a braced initializer but your opening paragraph suggests that your main concern is avoiding copies and moves; rather than an absolute requirement to use a braced initializer.

 // header
const std::vector &get_vec();

// cpp file
const std::vector &get_vec()
{
    static std::vector x;

    if ( x.empty() )
    {
        x.emplace_back(1,2,3);
        x.emplace_back(4,5,6);
        // etc.
    }

    return x;    
}