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    <p>It's a bug, and it's not specific to C++/CLI.</p> <p><a href="https://connect.microsoft.com/VisualStudio/feedback/details/100917/argument-const-ness-is-part-of-member-function-type-signature" rel="nofollow noreferrer">https://connect.microsoft.com/VisualStudio/feedback/details/100917/argument-const-ness-is-part-of-member-function-type-signature</a></p> <p>Fact is, the C++ compiler is supposed to strip off top-level const/volatile. Only const/volatile on the pointed-to type of a pointer or reference matters. If the compiler did that correctly, the CLR wouldn't have a say in what's going on.</p> <p>BTW this is the IL generated by the compiler with /clr:pure</p> <pre><code>.class private abstract auto ansi beforefieldinit Base extends [mscorlib]System.Object { .method public hidebysig specialname rtspecialname instance void .ctor() cil managed { .maxstack 1 L_0000: ldarg.0 L_0001: call instance void [mscorlib]System.Object::.ctor() L_0006: ret } .method public hidebysig newslot abstract virtual instance void Foo(int32 modopt([mscorlib]System.Runtime.CompilerServices.IsConst)) cil managed { } } .class private auto ansi beforefieldinit Derived extends Base { .method public hidebysig specialname rtspecialname instance void .ctor() cil managed { .maxstack 1 L_0000: ldarg.0 L_0001: call instance void Base::.ctor() L_0006: ret } .method public hidebysig virtual instance void Foo(int32 i) cil managed { .maxstack 0 L_0000: ret } } </code></pre> <p>This definitely violates the rule James listed concerning deletion of top-level qualifiers.</p> <p>Further relevant sections of the C++/CLI spec:</p> <blockquote> <p>8.8.10.1 Function overriding</p> <p>[snip]</p> <ol> <li>A derived class function explicitly overrides a base class virtual function having the same name, parameter-type-list, and cv-qualification, by using the function modifier override, with the program being ill-formed if no such base class virtual function exists</li> </ol> <p>12.3 Declarator types</p> <p>The C++ Standard (§8.3.5/3) is augmented, as follows:<br> The resulting list of transformed parameter types and the presence or absence of the ellipsis is the function’s parameter-type-list.</p> </blockquote> <p>So I am led to believe that the rule on deletion of cv-qualifiers applies to C++/CLI as well, because the spec specifically calls out section 8.3.5/3 of ISO Standard C++.</p>
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    1. POC++ vs. C++/CLI: Const qualification of virtual function parameters
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    1. COFor native code, that bug has been fixed, at least as of VS2008 SP1 (the compiler even gives a warning, C4373, "previous versions of the compiler did not override when parameters only differed by const/volatile qualifiers"). I can only reproduce the issue mentioned in the original post with CLI types (i.e., `ref class` types).
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      1. USJames McNellis
    2. CO@James, I concur that my repro code finally doesn't cause problems with VS2008 SP1 (the first fix didn't actually fix it). And I can repro your problem, since you listed a bug on Connect I'll validate it.
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