[Issue 2701] New: Can't declare struct, assign lvalue to it in same statement

d-bugmail at puremagic.com d-bugmail at puremagic.com
Sun Mar 1 17:34:41 PST 2009


http://d.puremagic.com/issues/show_bug.cgi?id=2701

           Summary: Can't declare struct, assign lvalue to it in same
                    statement
           Product: D
           Version: 2.025
          Platform: PC
        OS/Version: Windows
            Status: NEW
          Keywords: rejects-valid, spec
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla at digitalmars.com
        ReportedBy: dsimcha at yahoo.com


struct Bar {
    uint num;

    Bar opAssign(uint otherNum) {
        num = otherNum;
        return this;
    }
}

void main() {
    uint foo = 1;
    Bar bar = foo;  // Error:  e2ir:  cannot cast from uint to Bar.
    Bar bar2;
    bar2 = foo;   // Works.
}

Not sure if this is actually a valid bug, since the spec states that "The
assignment operator cannot be overloaded for rvalues that can be implicitly
cast to the lvalue type."  However, if the previous sentence does implicitly
disallow this from working, it should be stated more clearly, instead of in a
single sentence of language legalese.


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