Type declarations

[FPGA]

I am trying to use the following function defined in the ieee_proposed
library

-- to_signed (float)
function to_signed (
arg : UNRESOLVED_float; -- floating point input
constant size : NATURAL; -- length of output
constant check_error : BOOLEAN := float_check_error; -- check
for errors
constant round_style : round_type := float_round_style) --
rounding option
return SIGNED is

I want to test this function. I have given inputs to entity as below

float_in : in std_logic_vector(31 downto 0);
signed_out : out std_logic_vector(63 DOWNTO 0);

I want to try

signed_out <= to_signed(float_in);

Note that the input(arg) to the function to_signed is of type
UNRESOLVED_float. How do i convert this to std_logic_vector.
If i mention the float_in input of type UNRESOLVED_float, it gives me
error : "Unknown identifier: UNRESOLVD_float". This is the same
problem i am having with some of the other functions I am trying to
test.
The type declarations are in the architecture body and NOT BEFORE THE
DECLARATION OF THE ENTITY. How do i fix this problem?


Complete function definition ca be found here
http://www.vhdl.org/vhdl-200x/vhdl-200x-ft/packages/float_pkg_c.vhdl

Thanks