xup: move functions to an array #66

Job	Run time
cppcheck	4m 5s
code formatting check	21s
min features with gcc	1m 12s
min features with g++	1m 16s
min features with clang	1m 25s
max features with gcc	2m 25s
max features with g++	3m 21s
max features with clang	3m 5s
max features with gcc and DEBUG	1m 4s
max features with gcc for 32-bit arch (legacy OS)	2m 4s
max features with g++ for 32-bit arch (legacy OS)	2m 4s
max features with clang for 32-bit arch (legacy OS)	2m 2s
	24m 24s

Provide feedback