I try use traits get all public static function of a struct pass to template.

Compiler report  " .Function  is not accessible from module " with __traits(isStaticFunction, __traits(getMember, Type , name)).

If I add " __traits(getProtection, __traits(getMember, Type, name)) == "public" before "__traits(isStaticFunction, __traits(getMember, Type , name))", it report " argument void function(void*) nothrow @nogc has no protection".



If I add "isFunction!(typeof(__traits(getMember, Type, name)))" before all this, It report type State is not an expression.

If I use "isFunction!(__traits(getMember, BaseType, name)) ", it report again "argument void function(void*) nothrow @nogc has no protection"


how to do this ?

On Monday, 22 October 2018 at 10:16:22 UTC, test wrote:
> I try use traits get all public static function of a struct pass to template...

> how to do this ?

void allFunctions(T)() {
    import std.stdio;
    foreach (name; __traits(allMembers, T)) {
        static foreach (overload; __traits(getOverloads, T, name)) {
            static if (__traits(getProtection, overload) == "public" && __traits(isStaticFunction, overload)) {
                // 'overload' is an alias to a T's public static function
                writeln(name, ": ", typeof(overload).stringof);
            }
        }
    }
}

On Monday, 22 October 2018 at 10:29:56 UTC, Stanislav Blinov wrote:
> On Monday, 22 October 2018 at 10:16:22 UTC, test wrote:
>> I try use traits get all public static function of a struct pass to template...
>
>> how to do this ?
>
> void allFunctions(T)() {
>     import std.stdio;
>     foreach (name; __traits(allMembers, T)) {
>         static foreach (overload; __traits(getOverloads, T, name)) {
>             static if (__traits(getProtection, overload) == "public" && __traits(isStaticFunction, overload)) {
>                 // 'overload' is an alias to a T's public static function
>                 writeln(name, ": ", typeof(overload).stringof);
>             }
>         }
>     }
> }

On the line: static foreach (overload; __traits(getOverloads, Type, name)) , throw error: is not accessible from module


and

On Monday, 22 October 2018 at 10:45:07 UTC, test wrote:
> On Monday, 22 October 2018 at 10:29:56 UTC, Stanislav Blinov wrote:
>> On Monday, 22 October 2018 at 10:16:22 UTC, test wrote:
> and

On Monday, 22 October 2018 at 10:45:07 UTC, test wrote:

test1.d
=====================
alias Fn1       = void function();
struct XX {
        alias Fn        = Fn1;
        enum Y {
                aa
        }
        static void Test(){}
        int id;
}


test2.d
=====================
import test1;
void GetPub(BaseType)(){
        static foreach (name; __traits(allMembers, BaseType)) static if( name[0] !is '_' && __traits(getProtection, __traits(getMember, BaseType, name)) == "public" ) {
                static assert( hasMember!(BaseType.init, name));
                static if( __traits(isStaticFunction, __traits(getMember, BaseType, name)) ) {
                        pragma(msg, typeof(BaseType.init).stringof ~ "." ~ name);
                }
        }
}


extern(C) void main(){
        GetPub!XX;
}

On Monday, 22 October 2018 at 10:49:10 UTC, test wrote:
> On Monday, 22 October 2018 at 10:45:07 UTC, test wrote:
>> On Monday, 22 October 2018 at 10:29:56 UTC, Stanislav Blinov wrote:
> extern(C) void main(){
>         GetPub!XX;
> }

https://run.dlang.io/is/f295qE

On Monday, 22 October 2018 at 10:49:10 UTC, test wrote:

> test1.d
> =====================
> alias Fn1       = void function();
> struct XX {
>         alias Fn        = Fn1;
>         // ...
> }

'Fn' is not a static function, it's a type. I.e. you can declare a function pointer with it:

Fn func;

> test2.d
> =====================
> import test1;
> void GetPub(BaseType)(){
>     // ...
> }


My code works fine with your struct XX, with dmd 2.082.

std.traits.hasMember expects an aggregate *type*, but you're trying to pass as instance.

A revised GetPub:

void GetPub(BaseType)(){
        static foreach (name; __traits(allMembers, BaseType)) static if( name[0] !is '_' && is(typeof(__traits(getMember, BaseType, name))) && __traits(getProtection, __traits(getMember, BaseType, name)) == "public" ) {
                //static assert( hasMember!(BaseType.init, name));
                static assert(hasMember!(BaseType, name));
                static if( __traits(isStaticFunction, __traits(getMember, BaseType, name)) ) {
                        pragma(msg, BaseType.stringof ~ "." ~ name);
                }
        }
}

note the added check that the member is not a type: is(typeof(__traits(getMember, BaseType, name))).
You'll still need to iterate overloads if you want to get all static functions.

On Monday, 22 October 2018 at 11:18:20 UTC, Stanislav Blinov wrote:
> On Monday, 22 October 2018 at 10:49:10 UTC, test wrote:
>
>
> note the added check that the member is not a type: is(typeof(__traits(getMember, BaseType, name))).
> You'll still need to iterate overloads if you want to get all static functions.


Thanks for this.

some how when I call "is(typeof(__traits(getMember, BaseType, name))) " in the template, my code report others error like:

Error: no property fromPointer for type void
Error: template instance TypeTemplate!(BaseType) is used as a type

Error: template instance `TypeTemplate!(BaseType)` error instantiating

On Monday, 22 October 2018 at 11:42:59 UTC, test wrote:

> some how when I call "is(typeof(__traits(getMember, BaseType, name))) " in the template, my code report others error like:
>
> Error: no property fromPointer for type void
> Error: template instance TypeTemplate!(BaseType) is used as a type
>
> Error: template instance `TypeTemplate!(BaseType)` error instantiating

That would be hard to diagnose without actually seeing the code, it seems there's something else going on.

On Monday, 22 October 2018 at 11:42:59 UTC, test wrote:
> On Monday, 22 October 2018 at 11:18:20 UTC, Stanislav Blinov wrote:
>
> Error: template instance `TypeTemplate!(BaseType)` error instantiating


I use alias this to allow call static method on proxyType.

It work some time, but on other case it report:



The code throw error is:

struct TcpStream {
	
       void read(ubyte[] data){
           auto id2 = Fiber.getThis();  // Error: this for getBoxPayload needs to be type BoxedTypeNode not type TcpStream
      }
}

If the read is static method, then there is no error.

I can not fix this so I try use static method alias, but it work on normal case not my code (100KB+).


I try made a simple example but it has no error:

On Monday, 22 October 2018 at 11:59:21 UTC, test wrote:
> On Monday, 22 October 2018 at 11:42:59 UTC, test wrote:
> I try made a simple example but it has no error:


I find the way to show the error:

https://run.dlang.io/is/f8cULz


import std.traits;

struct FiberS {
	static auto getThis(){
		return Fiber.getId();
	}
}

struct Proxy(T){
 	T* ptr;
    alias getPayload this;

	@property ref auto getPayload() inout return {
		return * ptr ;
	}

    static auto getId(){
        return 1;
    }
}
alias Fiber = Proxy!(FiberS);


extern(C) void main(){
       auto id = Fiber.getThis(); // work here
}

struct TcpStream {
    void read(ubyte[] data){
           auto id = Fiber.getThis(); // not work here in my case
    }
}