vec2 make = (1.500000, 2.500000)
vec2 swap = (2.500000, 1.500000)
vec2 sum  = 4.000000
vec4f make = (1.000000, 2.000000, 3.000000, 4.000000)
vec4f rev  = (4.000000, 3.000000, 2.000000, 1.000000)
vec4f sum  = 10.000000