nim-stew/stew/objects.nim

template init*(lvalue: var auto) =
  mixin init
  lvalue = init(type(lvalue))

template init*(lvalue: var auto, a1: auto)=
  mixin init
  lvalue = init(type(lvalue), a1)

template init*(lvalue: var auto, a1, a2: auto) =
  mixin init
  lvalue = init(type(lvalue), a1, a2)

template init*(lvalue: var auto, a1, a2, a3: auto) =
  mixin init
  lvalue = init(type(lvalue), a1, a2, a3)

when not declared(default):
  proc default*(T: type): T = discard

proc toArray*[T](N: static int, data: openarray[T]): array[N, T] =
  doAssert data.len == N
  copyMem(addr result[0], unsafeAddr data[0], N)

template anonConst*(val: untyped): untyped =
  const c = val
  c

when not compiles(len((1, 2))):
  import typetraits

  func len*(x: tuple): int =
    arity(type(x))

# Get an object's base type, as a cstring. Ref objects will have an ":ObjectType"
# suffix.
# From: https://gist.github.com/stefantalpalaru/82dc71bb547d6f9178b916e3ed5b527d
proc baseType*(obj: RootObj): cstring =
  when not defined(nimTypeNames):
    raiseAssert("you need to compile this with '-d:nimTypeNames'")
  else:
    {.emit: "result = `obj`->m_type->name;".}

proc baseType*(obj: ref RootObj): cstring =
  obj[].baseType