type in vhdl corresponds to c-language: "uint32_t" or "unsigned long"

What's the closet data type in VHDL to the classic c-language data type "uint32_t", example:

#include "stdint.h"
void main() {
    uint32_t data = 0xFFFFFFFF;
}

From my understanding, VHDL's "positive" and "natural" types are just subsets of a signed "integer" type and are missing half of the range of c-langauge uint32_t type.

architecture sim of testbench is
    --integer range: -2,147,483,648 to +2,147,483,647
    --same as c-language int32_t
    signal a0 :integer  := 1;  

    --integer range: 0 to +2,147,483,647
    --same as c-language int32_t and'ed with 0x7FFFFFFF
    signal a1 :natural  := 1;

    --integer range: 1 to +2,147,483,647
    --same as c-language int32_t and'ed with 0x7FFFFFFF, and 0 thrown away
    signal a2 :positive := 1;

    --integer range: -1 to -2,147,483,648
    --same as c-language int32_t or'ed with 0x80000000, and 0 thrown away
    signal a3 :negative := 1;


    --unsigned integer range: 0 to 4,294,967,295
    --??????  does it exist in VHDL?
    signal a4 :uint32_t 

begin
end architecture;

library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;

entity testit is
end entity;

architecture sim of testit is
    subtype uint32_t is unsigned(31 downto 0);

    signal a1 :uint32_t := X"FFFFFFFF";
    signal a2 :uint32_t := X"AFFFFFFF";

    -- Error out of bounds
    --signal a3 :integer := 16#FFFFFFFF;
begin
end architecture;