On Tuesday, 20 June 2017 at 09:56:03 UTC, Bastiaan Veelo wrote:

Transferring this to GC, you could have @gc (the default), @nogc (the @safe equivalent) and the @trusted equivalent: @gc_code_that_is_acceptable_to_be_called_in_nogc_code_as_an_exception_to_the_rule. I'll abbreviate this as @gc78 until there is a better name.

It can already be done:

void gc78writeln(string what) @nogc
{   import std.stdio;
    alias WritelnType = void function(string) @nogc;

void main() @nogc
{   import std.stdio;
    gc78writeln("hello world!");

I wasn't skilled enough to make a generic version of this trough. And I do not know what happens if @nogc function ends up calling gc.

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