Re: switch statement with variable branches

[Stefan Koch via Digitalmars-d-learn]

On Thursday, 19 January 2017 at 01:22:56 UTC, Yuxuan Shui wrote:
Somehow I can't use ubyte variables behind 'case', but ulong 
works fine. Why is that?

void main() {
        alias TestType = ulong; // won't compile if = ubyte
        import std.stdio;
        TestType a,b,c;
        readf("%s %s %s ", &a, &b, &c);
        switch(c){
                case a: writeln("a");break;
                case b: writeln("b");break;
                default: assert(false);
        }
}

It is a bug that this code compiled.
Case Variables can only be used on const values, to prevent 
mutation of them inside the switch itself.

try to make the type a const ubyte.