• d-bugmail puremagic.com (31/31) Dec 15 2013 https://d.puremagic.com/issues/show_bug.cgi?id=11747

d-bugmail puremagic.com writes:

https://d.puremagic.com/issues/show_bug.cgi?id=11747

           Summary: Better error message with  disabled toString
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: Phobos
        AssignedTo: nobody puremagic.com
        ReportedBy: bearophile_hugs eml.cc



A low priority enhancement suggestion.

A way to disallow the printing of a struct is to use  disable on its toString:


struct Foo {
     disable string toString();
}
void main() {
    import std.stdio;
    Foo f;
    writeln(f);
}



But the missing function is only detected at link time (dmd 2.065alpha):

test2.obj(test2) 
 Error 42: Symbol Undefined _D5test23Foo8toStringMFZAya


So perhaps it's better to add to write a template constraint that verifies
toString is not  disabled, to catch the problem at compile-time.

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