How to do this in C++?
local inicfg = require "inicfg"
local color = imgui.ImFloat4(mainIni.color.R/255, mainIni.color.G/255, mainIni.color.B/255, 255)
if imgui.ColorEdit4('Color', color) then
local clr = join_argb(0, color.v[1] * 255, color.v[2] * 255, color.v[3] * 255, color.v[4] * 255)...