On Sunday, 27 October 2019 at 12:44:05 UTC, Per Nordlöw wrote:
In which circumstances can a `char` be initialized a non-7-bit
value (>= 128)? Is it possible only in non-@safe code?
And, if so, what will be the result of casting such a value to
`dchar`? Will that result in an exception or will it interpret
the `char` using a 8-bit character encoding?
I'm asking because I'm pondering about how to specialize the
non-7-bit `needle`-case of the following array-overload of
`startsWith` when `T` is `char`:
bool startsWith(T)(scope const(T)[] haystack,
scope const T needle)
{
static if (is(T : char)) { assert(needle < 128); } // TODO
convert needle to `char[]` and call itself
if (haystack.length >= 1)
{
return haystack[0] == needle;
}
return false;
}
char in D is always unsigned, it is not implementation-specific.
Therefore it can take values up to (2^8)−1, If you want a
signed 8 byte type you can use ubyte, which obviously can take up
from -(2^7) to (2^7)-1
