I'm using C++11 and higher and I was asking myself if it is safe to get the number of bytes required for a datatype like std::uint16_t to send over length agnostic protocols. More precise is it safe to call sizeof(std::uint16_t) and can I assume that this is always 2? What about std::int16_t?
Safe way to get number of bytes for a data type in C++
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That would be the
sizeofoperator.No. You can only rely on that when byte is 8 bits.
Same.
For network communication, what you may need to know is how many octets a type is. That can safely be calculated like this:
sizeof(std::uint16_t) * (CHAR_BIT / 8), and will be 2 forstd::uint16_t. Note that not all systems necessarily have thestd::uint16_ttype.