genAst

[geekrelief]

This works: 
    
    
    import macros
    import std/genasts
    
    macro applyThem(x,y: tuple; op: untyped): untyped =
      result = nnkTupleConstr.newNimNode
      for i in 0 ..< x.getTypeImpl.len:
        let ast = genAst(i, x, y, op):
          block:
            var
              a{.inject.} = x[i]
              b{.inject.} = y[i]
            op
        result.add ast
    assert applyThem( (x: 3, y: 4), (u: 4,v: 5), a+b ) == (7,9)
    assert applyThem( (1, 2.0), (3, 4.5), a*b) == (3, 9.0)
    
    
    Run