Re: templated lambda with {} cause GC

[Paul Backus via Digitalmars-d-learn]

On Friday, 10 August 2018 at 09:57:53 UTC, learnfirst1 wrote:

import core.stdc.stdio;

struct Test {
        string name ;
}

void T(alias pred, A...)(){
        __gshared t = Test(A) ;
         pred(t);
}

extern(C) void main(){
	T!(t => printf("test 1 name = %s\n".ptr, t.name.ptr), "test") 
;  // build OK
        T!(t => {
                printf("test 2 name = %s\n".ptr, t.name.ptr);
        }, "test") ; // build error
}

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

The arrow syntax doesn't work for multi-line lambdas; you need to 
write them using what the spec calls "function literal" syntax 
[1]:

    T!((t) { // <- Parens around the argument, no arrow
        printf("test 2 name = %s\n".ptr, t.name.ptr);
    }, "test") ;

[1] https://dlang.org/spec/expression.html#function_literals