That's what arrays are for. You can also do structure packing using implementation-specific tricks. SBCL's SB-ALIEN package has a nice interface for doing this:

That's what arrays are for. You can also do structure packing using implementation-specific tricks. SBCL's SB-ALIEN package has a nice interface for doing this: http://www.sbcl.org/manual/#Foreign-Types http://www.sbcl.org/manual/#Foreign-Types A really cool example of SB-ALIEN in action is jiyunomegami's native type extensions for the Vacietis C-to-CL transpiler: https://github.com/jiyunomegami/Vacietis/commits/master https://github.com/jiyunomegami/Vacietis/commits/master (commits 5504079d63eb2745f6b8ef7ec1cf9bb3151994eb onward)