Re: how to get UDA only for methods

[Stanislav Blinov via Digitalmars-d-learn]

On Wednesday, 17 October 2018 at 02:54:26 UTC, test wrote:
I need get the Route UDA only for method without (static 
methods, property, constructor, destructor), dont know how to 
do it.


1) Note that __traits(allMembers, T) gets you a tuple of names, 
not actual member aliases.

2) Remember there may be overloads
3) Filter the unwanted out:

import std.traits;
import std.meta : Alias, AliasSeq;
import std.stdio;
import std.string : startsWith;
import std.algorithm : among;

alias operatorNames = AliasSeq!("opUnary", "opIndexUnary", 
"opCast", "opBinary", "opBinaryRight",
"opIn", "opIn_r", "opEquals", 
"opCmp", "opCall", "opAssign",
"opIndexAssign", "opOpAssign", 
"opIndexOpAssign", "opSliceOpAssign",
"opIndex", "opSlice", "opDollar", 
"opDispatch");


void main() {
writeln(getRoutes!App);
}

struct Route { string r; }

Route[] getRoutes(T)(){
Route[] routes;
foreach (name; __traits(allMembers, T)) {
alias member = Alias!(__traits(getMember, T, name));
static if (__traits(isStaticFunction, member) ||
   name.startsWith("__")  ||
   name.among(operatorNames))
{}
else static if (is(typeof(member) == function)) {
foreach (overload; __traits(getOverloads, T, name)) {
pragma(msg, name);
static foreach(route; getUDAs!(overload, Route)) {
routes  ~= route;
}
}
}
}
return routes;
}

struct App {

@Route("xxx")
int field;

@Route("/blah")
this(this) {}

@Route("ggg")
~this() {}

@Route("/index")
void home() {}

@Route("/index2")
void home(bool overloaded) {}

@Route("/blog")
void blog(){}
}

how to get UDA only for methods

[test via Digitalmars-d-learn]

I need get the Route UDA only for method without (static methods, 
property, constructor, destructor), dont know how to do it.



Route[] getRoutes(T)(){
Route[] routes;
foreach(int i, m; __traits(allMembers, T) ){
pragma(msg, m.stringof);
static foreach(int j, r; getUDAs!(m, Route) ) {
routes  ~= r;
}
}
return routes;
}

struct App {

@Route("/index")
void home(){

}

@Route("/blog")
void blog(){

}
}