| --Example using pointers to member functions |
| |
| require("import") -- the import fn |
| import("member_pointer") -- import code |
| |
| for k,v in pairs(member_pointer) do _G[k]=v end |
| |
| function check(what, expected, actual) |
| assert(expected == actual,"Failed: "..what.." Expected: "..expected.." Actual: "..actual) |
| end |
| |
| -- Get the pointers |
| area_pt = areapt() |
| perim_pt = perimeterpt() |
| |
| -- Create some objects |
| s = Square(10) |
| |
| -- Do some calculations |
| check ("Square area ", 100.0, do_op(s,area_pt)) |
| check ("Square perim", 40.0, do_op(s,perim_pt)) |
| |
| -- Try the variables |
| -- these have to still be part of the 'member_pointer' table |
| memberPtr = member_pointer.areavar |
| memberPtr = member_pointer.perimetervar |
| |
| check ("Square area ", 100.0, do_op(s,member_pointer.areavar)) |
| check ("Square perim", 40.0, do_op(s,member_pointer.perimetervar)) |
| |
| -- Modify one of the variables |
| member_pointer.areavar = perim_pt |
| |
| check ("Square perimeter", 40.0, do_op(s,member_pointer.areavar)) |
| |
| -- Try the constants |
| memberPtr = AREAPT |
| memberPtr = PERIMPT |
| memberPtr = NULLPT |
| |
| check ("Square area ", 100.0, do_op(s,AREAPT)) |
| check ("Square perim", 40.0, do_op(s,PERIMPT)) |
| |