有没有办法构造一个常量表达式函数来获得双精度值的位表示？

#include <cstdint>
#include <bit> // C++20中引入，用于std::bit_cast

// C++17及以下版本的实现
template <typename T>
constexpr uint64_t double_to_bits(T value) {
    static_assert(std::is_same<T, double>::value, "This function only works with double.");
    uint64_t bits;
    std::memcpy(&bits, &value, sizeof(bits));
    return bits;
}

// C++20版本的实现，使用std::bit_cast
template <typename T>
constexpr auto double_to_bits_v2(T value) {
    static_assert(std::is_same<T, double>::value, "This function only works with double.");
    return std::bit_cast<std::uint64_t>(value);
}

int main() {
    double d = 123.456;
    constexpr uint64_t bits_cpp17 = double_to_bits(d);
    constexpr auto bits_cpp20 = double_to_bits_v2(d);

    // 使用bits_cpp17和bits_cpp20...
    return 0;
}