standards

Is it legal to zero array of doubles (using memset(,0,)) or struct containing doubles ? The question implies two different things: (1) From the point of view of C standard, is this UB of not ? (on a fixed platform, how can this UB ... it just depends of floating representation that's all ...) (2) From practical point of view: is it ok on intel platform ? (no matter what standard is saying). The C99 standard Annex F says: This annex specifies C language support for the IEC 60559 floating-point standard. The IEC 60559 floating-point standard is specifically Binary floating-point arithmetic for

The C++ standard prohibits declaring types or defining anything in namespace std , but it does allow you to specialize standard STL templates for user-defined types. Usually, when I want to specialize std::swap for my own custom templated type, I just do: namespace std { template <class T> void swap(MyType<T>& t1, MyType<T>& t2) { t1.swap(t2); } } ...and that works out fine. But I'm not entirely sure if my usual practice is standard compliant. Am I doing this correctly? What you have is not a specialization, it is overloading and exactly what the standard prohibits. (However, it will almost

I've been reviewing the draft version of the C++11 standard. Specifically the section on lambdas , and I am confused as to the reasoning for not introducing polymorphic lambdas. For example, amongst the 100001 ways polymorphic lambdas could be used, I had hoped we could use code such as the following: template<typename Container> void foo(Container c) { for_each(c.begin(), c.end(), [](T& t) { ++t; }); } What were the reasons: Was it that the committee ran out of time? That polymorphic lambdas are too hard to implement? Or perhaps that they are seen as not being needed by the PTB ? Note: Please

In pretty much all applications that have a menu bar, some of the items have an ellipsis (...) after them, and some don't. Is there a well known convention on when to put that ellipsis there and when not to? When do you do it? Do you do it? I have looked at various windows applications, and this is what I have come to: Ellipsis Menu items which opens a form that require user input to do something (Replace, Go to, Font) No ellipsis Menu items which just does something (Cut, Paste, Exit, Save) Menu items which opens a form that does not require user input (About, Check for Updates) But then