[Issue 3070] New: Implicitly conversion on function call

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=3070

           Summary: Implicitly conversion on function call
           Product: D
           Version: 2.030
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Severity: trivial
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: k0l0b0k.void at gmail.com


I have next pieces of code:

struct MyString
{
    public MyString opAssign(string pStr)
    {
        throw new Error("");
    }

    public MyString opCast(string pStr)
    {
        throw new Error("");
    }

    public MyString opImplicitCast(string pStr)
    {
        throw new Error("");
    }

    this(string pStr)
    {
        throw new Error("");
    }
}

void foo(MyString pStr)
{
}

int main(char[][] args)
{
    MyString str = "test1";
    str = "test2";
    foo(str);
    foo("test3");        // error "Error: cannot implicitly convert expression
("test3") of type immutable(char)[] to MyString
    return 0;
}


This is just sample. So, my trouble is to pass string argument to foo() with
implicit conversion to MyString struct (I also tried class, with no results).
I'm googled by this topic, but nothing found. Can you help me? This is not a
bug (I think), but the question - how I can implicitly convert from one object
to another in the as C++ does (C++ will call constructor with parameter type
"string"). How I can make same in D?

Thanks in advance!

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