class C { using namespace std;// error }; namespace N { using namespace std; // ok } int main () { using namespace std; // ok
The following two lines do the same thing in Visual Studio 2005: 开发者_如何学Go myString.insert(myString.size(),1,myNewChar);
Unlike Java, in C/C++ the following is allowed: int* foo () { if(x) return p; // What if control reaches here?
out of curiousity and because I don\'t have my copy of the standard at hand right now: Given an implementation where null pointers are not represented by an all-zeros pattern, will uninitialized poin
struct A { virtual void foo();// unused and unimplemented virtual void bar () {} }; int main () { A obj;// ok
I know that deleteing a null pointer is a no-op: In either alternative, if the value of the operand of delete is the null pointer the operation has no effect.
This question already has answers here: Closed 11 years ago. Possible Duplicate: Undefined Behavior and Sequence Points
Why has std::swap been moved to the <utility> header for C++11? N3290 C.2.7 says: 17.6.3.2 Effect on original feature: Function swap moved to a different header
Considering next two classes : struct Base { virtual ~Base() { } virtual void foo() = 0; }; struct Derived : public Base
Edit In consideration of the answer response below regarding the reference ECMAScript Language Specification - 11.13.2 Compound Assignment
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