• learnfirst1 (14/14) Aug 10 2018 mixin template test(A...){
• learnfirst1 (16/17) Aug 10 2018 mixin template test(A...){
• Kagamin (2/10) Aug 10 2018 Looks like some problem with tuple, try __gshared a = A[0];
• learnfirst1 (3/5) Aug 10 2018 this work, it report no error but give a link problem. (this
• learnfirst1 (23/25) Aug 10 2018 mixin template test(A...){
• Kagamin (14/14) Aug 10 2018 try this:
• Kagamin (9/9) Aug 10 2018 Mixim template can only introduce declarations, not statements, a
• Radu (11/20) Aug 10 2018 Except that you can't use tuples for that, a working sample:
• learnfirst1 (3/12) Aug 10 2018 Thanks, this work for me. my second example should be a dmd bug

learnfirst1 <learnfirst1 gmail.com> writes:

mixin template test(A...){
         __gshared a = A;
         a++;
}

extern(C) void main(){
         mixin test!123;
}

-------------

I dont want to use string mixin to intro a lot un want symbol,  
try with mixin template find this not work.

I know if mixin test on global it should not working, but why not 
make the limit for function scope ?


I try use D for a WASM project then find so much limitation with 
no good reason.  or I missing some thing here ?

learnfirst1 <learnfirst1 gmail.com> writes:

On Friday, 10 August 2018 at 12:38:55 UTC, learnfirst1 wrote:
 mixin template test(A...){


mixin template test(A...){
         __gshared a = A;
}

extern(C) void main(){
         mixin test!123;
}

---------------

duplicate symbol __D4test4mainUZ8__mixin111__a_field_0i in:
     test.o
ld: 1 duplicate symbol for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to 
see invocation)
Error: linker exited with status 1


this really make no sense,  what is wrong with it?    (same code 
build with ldc2)

Kagamin <spam here.lot> writes:

On Friday, 10 August 2018 at 13:01:21 UTC, learnfirst1 wrote:
 duplicate symbol __D4test4mainUZ8__mixin111__a_field_0i in:
     test.o
 ld: 1 duplicate symbol for architecture x86_64
 clang: error: linker command failed with exit code 1 (use -v to 
 see invocation)
 Error: linker exited with status 1


 this really make no sense,  what is wrong with it?    (same 
 code build with ldc2)

Looks like some problem with tuple, try __gshared a = A[0];

learnfirst1 <learnfirst1 gmail.com> writes:

On Friday, 10 August 2018 at 13:10:57 UTC, Kagamin wrote:
 On Friday, 10 August 2018 at 13:01:21 UTC, learnfirst1 wrote:
 Looks like some problem with tuple, try __gshared a = A[0];

this work,  it report no error but give  a link problem.  (this 
could be a bug ?)

learnfirst1 <learnfirst1 gmail.com> writes:

On Friday, 10 August 2018 at 13:17:13 UTC, learnfirst1 wrote:
 this work,  it report no error but give  a link problem.  (this 
 could be a bug ?)

mixin template test(A...){
         __gshared int a = A[0];
         pragma(inline, true) // remove this will work
         static extern(C) int test(){
                 a++;
                 return 0;
         }
         int dummy = test();
}

import core.stdc.stdio;
extern(C) void main(){
     mixin test!1;
     printf("a=%d\n", a);
}

-----------------------
Undefined symbols for architecture x86_64:
   "__D4test4mainUZ8__mixin1QvUNbNiZi", referenced from:
       _main in test.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to 
see invocation)
Error: linker exited with status 1

Kagamin <spam here.lot> writes:

try this:

mixin template test(A...){
         __gshared int a = A[0];
         int dummy = (){
                 a++;
                 return 0;
         }();
}

import core.stdc.stdio;
int main(){
     mixin test!1;
     printf("a=%d\n", a);
     return 0;
}

Kagamin <spam here.lot> writes:

Mixim template can only introduce declarations, not statements, a 
workaround is a lambda called in place.

mixin template test(A...){
         __gshared a = A;
         int dummy = (){ a++; return 0; }();
}

extern(C) void main(){
         mixin test!123;
}

Radu <void null.pt> writes:

On Friday, 10 August 2018 at 13:05:24 UTC, Kagamin wrote:
 Mixim template can only introduce declarations, not statements, 
 a workaround is a lambda called in place.

 mixin template test(A...){
         __gshared a = A;
         int dummy = (){ a++; return 0; }();
 }

 extern(C) void main(){
         mixin test!123;
 }

Except that you can't use tuples for that, a working sample:

mixin template test(alias A){
         __gshared a = A;
         int dummy = (){ a++; return 0; }();
}

extern(C) void main(){
     mixin test!123;

     import core.stdc.stdio;
     printf("%d", a);
}

learnfirst1 <learnfirst1 gmail.com> writes:

On Friday, 10 August 2018 at 13:05:24 UTC, Kagamin wrote:
 Mixim template can only introduce declarations, not statements, 
 a workaround is a lambda called in place.

 mixin template test(A...){
         __gshared a = A;
         int dummy = (){ a++; return 0; }();
 }

 extern(C) void main(){
         mixin test!123;
 }

Thanks, this work for me.   my second example should be a dmd bug 
? (ldc work)