On Tuesday, 2 September 2014 at 12:54:55 UTC, Nordlöw wrote:
Is it possible to override the behaviour of to!string(x) when x
is an enum. I'm asking because this
enum CxxRefQualifier
{
none,
normalRef,
rvalueRef
}
string toString(CxxRefQualifier refQ) @safe pure nothrow
{
final switch (refQ)
{
case CxxRefQualifier.none: return "";
case CxxRefQualifier.normalRef: return "&";
case CxxRefQualifier.rvalueRef: return "&&";
}
}
doesn't affect behaviour of to!string(x) when x is an instance
of CxxRefQualifier.
That won't work, because your "toString" is a free function. The
module system doesn't allow this kind of "Koenig lookup"-like
hijack. The only reason it allows for things like front/popFront
and arrays, is that the other modules import std.array, and are
"aware" of the functions. This is not true for user defined
types. This may or may not be a feature :)
Unless we allow defining "enum-member functions", AFAIK, it is
impossible to override the printing behavior for enums... short
of injecting your own modules in std.format/std.conv. Or to have
a parameter "moduleLookup" in said template functions.