By the way, C++20 designated initializers works like a charm for this. foo::some_func({ .a = 8, .b = false }); (I view this and std::span as the

By the way, C++20 designated initializers works like a charm for this. foo::some_func({ .a = 8, .b = false }); (I view this and std::span as the only two usable features in C++20, and pretty much everything else can go to the dustbin or the drawing board.)