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4964310
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2011-02-11T00:20:43.340
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Well, my money is on a bug. You don't mention which compiler you're using, but the stdafx suggests a variety of Visual Studio, which I don't have. The specification says that decltype(e) should have the type of e if e is an entity. An entity is a value, object, reference, function, enumerator, type, class member, template, template specialization, namespace, parameter pack, or this. In your example, Mantissa is a prvalue by virtue of being a non-class template parameter, which, as near as I can tell is a value and therefore an entity. So, it appears that it should work, according to the spec. I've tried your code (with minor, irrelevant modifications) in two other compilers: CodeGear RAD Studio 2010 and g++ 4.3.4. In RAD Studio, it fails to find the correct template: I get 'cannot find "max"'. If I add a "max" enum value to the base NumericLimits class, the static_assert finds that value and does a comparison. In g++, I get internal compiler errors. For what it's worth, you can 'launder' the type through a static variable like so: <pre><code> template<short Mantissa, short Exponent, short Base = 10> class AllocFactorScientific { static decltype(Mantissa) MantissaLaundry; static_assert(Mantissa > 0,"Mantissa component MUST be > zero"); //why if this works: static_assert(Mantissa < NumericLimits<short>::max, "Provided number is too large."); //this works as well now: static_assert(Mantissa < NumericLimits<decltype(MantissaLaundry)>::max, "Provided number is too large."); private: long double factor_; </code></pre> This appears to work in RAD Studio, perhaps it will as well in Visual Studio. Alternately, you can narrow down the issue and file a bug report.
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