How to manage endianess of double from network

Question

I have a BIG problem with the answer to this question Swap bits in c++ for a double

Yet, this question is more or less what I search for: I receive a double from th

Answer 1

I could not make John Källén code work on my machine. Moreover, it might be more useful to convert the double into bytes (8 bit, 1 char):

template
string to_byte_string(const T& v)
{
    char* begin_ = reinterpret_cast(v);
    return string(begin_, begin_ + sizeof(T));
}

template
T from_byte_string(std::string& s)
{
    assert(s.size() == sizeof(T) && "Wrong Type Cast");
    return *(reinterpret_cast(&s[0]));
}

This code will also works for structs which are using POD types.

If you really want the double as two ints

double d;
int* data = reinterpret_cast(&d);

int first = data[0];
int second = data[1];

Finally, long int will not always be a 64bit integer (I had to use long long int to make a 64bit int on my machine).