import std.conv; enum Tag { A ,AB } void main() { Tag tag1 = to!Tag("A"); // ok Tag tag2 = to!Tag("AB"); // fail } ConvException: Unexpected 'B' when converting from type string to type Tag It appears if you have an enum field name that begins with another field's name std.conv.to fails to parse it. This is a blocker for me.
(In reply to comment #0) > This is a blocker for me. OK not a blocker, I can implement a simple template function that converts strings to fields.
First attempt at a workaround: import std.stdio; import std.conv; import std.string; import std.traits; import std.metastrings; string toSwitch(T)() { typeof(return) result; string cases; foreach (arg; EnumMembers!T) { cases ~= "case " ~ `"` ~ to!string(arg) ~ `"` ~ ":\n"; cases ~= Format!("return %s.%s;\n", T.stringof, to!string(arg)); } result ~= " auto myTo(string input) { switch(input) { " ~ cases ~ ` default: throw new Exception(format("Can't convert '%s' to type %s.", input, ` ~ `"` ~ T.stringof ~ `"` ~ `)); } } `; return result; } template myTo(T) if (is(T == enum)) { mixin(toSwitch!T); } enum Tag { A ,AB } void main() { Tag tag1 = myTo!Tag("A"); // ok Tag tag2 = myTo!Tag("AB"); // ok Tag tag3 = myTo!Tag("ABC"); // fail, ok } Works pretty nicely even though it can be implemented much nicer. Yay D. :)
*** This issue has been marked as a duplicate of issue 4744 ***