Re: Runtime evaluation

[David Nadlinger]

You could generate the if/else-chain, lookup table, etc. via 
metaprogramming to save you the typing and code duplication (probably a 
foreach over std.traits.EnumMembers will be involved).

David

On 7/7/11 11:23 PM, nrgyzer wrote:
Hi guys,

I'm trying to read a string from a text file which contains a value of an 
enumeration like:

enum MyEnum : string {
    Entry_1 = "abc",
    Entry_2 = "def",
    Entry_3 = "ghi",
}

Stream s = new File("myFile.ext", FileMode.In);
uint len;
s.read(len);
string entry = cast(string) s.readString(len);
s.close();

writeln(mixin("MyEnum." ~ entry));

myFile.ext may contain:
...
Entry_2
Entry_1
Entry_2
Entry_3
...

But mixin's are for compile time only... is there any chance to do this or do 
I've to use another method (like if/else or switch/case):

if (entry == "Entry_1") ...
else if (entry == "Entry_2") ...
...

Thanks a lot!