A toy structure of arrays class in C++ 17, assuming types of elements are known at compile time.
Currently here are two implementations, the meta-struct version and std::tuple version.
using vec4 = std::array<float, 4>;
structure_of_arrays<vec4, vec4, float> particles;
particles.reserve(...);
particles.push_back(vec4{0.F, 0.F, 0.F, 0.F}, vec4{0.F, 0.F, 1.F, 0.F}, 2.F);
particles.push_back(...);
particles.push_back(...);
std::cout << particles.get<2>(0) << std::endl; // 2.0
particles.pop_back();
particles.insert(index, vec4{}, vec4{}, float{});