Why am I getting this error?

I am trying to create a simple string switch statement. Now, I know that you can use different variable types for the switch statement, but I keep getting an error that says "switch quanity is not an integer". Isnt it possible to have a "string" switch statement?

Here is the switch:

Code:

string translate( string reg )
{
    switch (reg)
    {
           case "$t0" :    return "01000";
           case "$t1" :    return "01001";
           case "$t2" :    return "01010";
           case "$t3" :    return "01011";
           case "$t4" :    return "01100";
           case "$t5" :    return "01101";
           case "$t6" :    return "01110";
           case "$t7" :    return "01111";
           case "$t8" :    return "10000";
           case "$t9" :    return "10001";
           case "$a0" :    return "00100";
           case "$a1" :    return "00101";
           case "$a2" :    return "00110";
           case "$a3" :    return "00111";
           case "$v0" :    return "00010";
           case "$v1" :    return "00011";
           default: return reg;
           
    }
}

Nope.

Use a map instead.

if statements are much simpler.