[solved] any workaround for incomplete type ?

[D.J.Peters]

I know forward declared UDT's can only be used as UDT ptr
but after many years of this limitation exist a workaround may be with the new macro features ?

Joshy

Code: Select all

type _vec3 as vec3 ' forward declare

type vec2
  declare constructor(byref x as const single=0.0, byref x as const single=0.0)
  declare function xxx as _vec3 ' <--- error 71: Incomplete type
  as single x=any,y=any
end type
constructor vec2(byref a as const single, byref b as const single)
  x=a:y=b
end constructor

type vec3
  declare constructor(byref x as const single=0.0, byref x as const single=0.0, byref z as const single=0.0)
  as single x=any,y=any,z=any
end type
constructor vec3(byref a as const single, byref b as const single, byref c as const single)
  x=a:y=b:z=c
end constructor

function vec2 . xxx as vec3
  vec3(x,x,x)
end function

[fxm]

I know forward declared UDT's can only be used 'as UDT ptr'

• or 'byref as UDT':

  Code: Select all

  type _vec3 as vec3 ' forward declare
  
  type vec2
    declare constructor(byref x as const single=0.0, byref x as const single=0.0)
    declare function xxx() byref as _vec3
    as single x=any,y=any
  end type
  constructor vec2(byref a as const single, byref b as const single)
    x=a:y=b
  end constructor
  
  type vec3
    declare constructor(byref x as const single=0.0, byref x as const single=0.0, byref z as const single=0.0)
    as single x=any,y=any,z=any
  end type
  constructor vec3(byref a as const single, byref b as const single, byref c as const single)
    x=a:y=b:z=c
  end constructor
  
  function vec2.xxx() byref as vec3
    static v as vec3
    v = vec3(1,2,3)
    return v
  end function
  
  dim v2 as vec2, v3 as vec3
  v3 = v2.xxx() ' <--- function always used like a function returning by value (by copying the returned reference)
  

[D.J.Peters]

@fxm static allocation and returning byref I see thank you.

Joshy