On Monday, 17 June 2013 at 00:36:40 UTC, David Nadlinger wrote:
To expand on that a bit: In the case of default parameters,
instead of trying to directly generate a string representation
The thing here is I'm not really generating the string, this
comes out of the compiler and I don't think it is available any
other way.
void foo(int a, int b = 10) {}
pragma(msg, typeof(foo).stringof);
gives:
void(int a, int b = 10)
And from that, I read out the parameter names and the default
values, but they are all as strings. So, to get it back to a
value, I mixin(that slice of string)
The short version of what web.d tries to do is:
void callFunction(alias fun)(string[string] arguments) {
ParameterTypeTuple!fun args;
foreach(i, arg; args) {
string arg_name = ParameterNames!(fun)[i] ;
if(arg_name in arguments)
args[i] = to!arg(arguments[arg_name]);
else if(arg has default)
args[i] = mixin(ParameterDefaults!(fun)[i]);
else
throw new Exception ("argument " ~ arg_name ~ " is
missing");
}
fun(args);
}
that obviously won't compile cuz of the pseudocode, but that's
more or less what I'm trying to do.
