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digitalmars.D.learn - need help about get all public static function name

reply test <test gmail.com> writes:
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 ?
Oct 22 2018
parent reply Stanislav Blinov <stanislav.blinov gmail.com> writes:
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);
             }
         }
     }
}
Oct 22 2018
parent reply test <test gmail.com> writes:
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
Oct 22 2018
parent reply test <test gmail.com> writes:
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;
}
Oct 22 2018
next sibling parent test <test gmail.com> writes:
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
Oct 22 2018
prev sibling parent reply Stanislav Blinov <stanislav.blinov gmail.com> writes:
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.
Oct 22 2018
parent reply test <test gmail.com> writes:
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
Oct 22 2018
next sibling parent Stanislav Blinov <stanislav.blinov gmail.com> writes:
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.
Oct 22 2018
prev sibling parent reply test <test gmail.com> writes:
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:
Oct 22 2018
parent reply test <test gmail.com> writes:
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
     }
}
Oct 22 2018
parent reply Stanislav Blinov <stanislav.blinov gmail.com> writes:
On Monday, 22 October 2018 at 12:03:22 UTC, test wrote:

 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
     }
 }


Let's analyze this call:

auto id = Fiber.getThis();

You're trying to call a static function 'getThis' on Fiber.
The type 'Fiber' is really a Proxy!FiberS. Proxy doesn't have a 
static getThis() function. So the compiler tries an 'alias this', 
which forwards to a non-static member function getPayload(). To 
call that function, you need an instance of 'Proxy', which you 
don't have.
I guess the first error message ("this for getPayload needs to be 
type Proxy not type TcpStream") just doesn't report that clearly.
Oct 22 2018
parent reply test <test gmail.com> writes:
On Monday, 22 October 2018 at 12:16:50 UTC, Stanislav Blinov 
wrote:

 On Monday, 22 October 2018 at 12:03:22 UTC, test wrote:
 You're trying to call a static function 'getThis' on Fiber.
 The type 'Fiber' is really a Proxy!FiberS. Proxy doesn't have a 
 static getThis() function. So the compiler tries an 'alias 
 this', which forwards to a non-static member function 
 getPayload(). To call that function, you need an instance of 
 'Proxy', which you don't have.
 I guess the first error message ("this for getPayload needs to 
 be type Proxy not type TcpStream") just doesn't report that 
 clearly.



But this work:


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


here also dont have Fiber instance.
Oct 22 2018
parent test <test gmail.com> writes:
On Monday, 22 October 2018 at 12:32:57 UTC, test wrote:

 On Monday, 22 October 2018 at 12:16:50 UTC, Stanislav Blinov 
 wrote:

 On Monday, 22 October 2018 at 12:03:22 UTC, test wrote:
 You're trying to call a static function 'getThis' on Fiber.
 The type 'Fiber' is really a Proxy!FiberS. Proxy doesn't have 
 a static getThis() function. So the compiler tries an 'alias 
 this', which forwards to a non-static member function 
 getPayload(). To call that function, you need an instance of 
 'Proxy', which you don't have.
 I guess the first error message ("this for getPayload needs to 
 be type Proxy not type TcpStream") just doesn't report that 
 clearly.



 But this work:


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


 here also dont have Fiber instance.



I think this is a bug.

If I use "alias this " with a FiberS instance tuple memebr, it 
will work.  but if I use alias this with  propery , it only work 
on static method, on delegate method it will use delegate this.

This is kind like Javascript method this is come from caller 
place. I think it is a bug.  please help me confirm this.  If so 
please made a bug report for me.
Oct 22 2018