test C++ register, C++ (clang)

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//clang 3.8.0

#include <iostream>
#include <array>

typedef uint8_t u8;
typedef uint16_t u16;
typedef uint32_t u32;
typedef uint64_t u64;
typedef unsigned int uINT;

namespace registers {
    template<u32 pon_def, bool single_bf>
    struct register_t {
      constexpr static u32 const PON_DEF   = pon_def;
      constexpr static u32 const SINGLE_BF = single_bf;
    };
}

template<u32 bitoffset, u32 bitlength, u32 mask, bool maskable, u32 pon_def, bool byte_writeable> 
struct registerfield_attr_t {
  constexpr static u32 const  BITOFFSET      = bitoffset;
  constexpr static u32 const  BITLENGTH      = bitlength;
  constexpr static u32 const  MASK           = mask;
  constexpr static bool const MASKABLE       = maskable;
  constexpr static u32 const  PON_DEF        = pon_def;
  constexpr static bool const BYTE_WRITEABLE = byte_writeable;
};

//! @brief bitfield structure of register RSU_EIRQ_S_REG (0x60000C0C).
struct rsu_eirq_s_reg_t final : registers::register_t<0x00000000, true> {
  union {
    struct {
      uINT RSU_EIRQ_S_BUS_TIMEOUT :  4; // rws, pon_def = 0
      uINT                        : 28; // reserved
    };
    u32 value;
  };
  //Bitfield attributes (BITOFFSET, BITLENGTH, MASK, MASKABLE, PON_DEF, BYTE_WRITEABLE)
  constexpr static registerfield_attr_t<0U, 1U, 0x00000001U, 0, false, true> const RSU_EIRQ_S_BUS_TIMEOUT_ATTR = {};
};

u32 value;
volatile rsu_eirq_s_reg_t & RSU_EIRQ_S_REG = *reinterpret_cast<rsu_eirq_s_reg_t volatile *>(&value);

int main()
{
    std::cout << "Hello, world!\n";
    std::cout << sizeof(rsu_eirq_s_reg_t) << std::endl;
    std::cout << rsu_eirq_s_reg_t::PON_DEF << std::endl;
    std::cout << rsu_eirq_s_reg_t::SINGLE_BF << std::endl;
    
    rsu_eirq_s_reg_t foo;
    foo.RSU_EIRQ_S_BUS_TIMEOUT = 1;
    
    RSU_EIRQ_S_REG.value = 5;
    
    std::cout << RSU_EIRQ_S_REG.RSU_EIRQ_S_BUS_TIMEOUT << std::endl;
}

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Compilation time: 0.72 sec, absolute running time: 0.07 sec, cpu time: 0.01 sec, memory peak: 3 Mb, absolute service time: 0,8 sec