Both (a) and (b) result in undefined behavior. It’s always undefined behavior to call a member function through a null pointer. If the function is static, it’s technically undefined as well, but there’s some dispute. The first thing to understand is why it’s undefined behavior to dereference a null pointer. In C++03, there’s actually a …
A. It is not valid HTML nor XHTML In the official W3C XHTML specification, Section B. “Element Prohibitions”, states that: “form must not contain other form elements.” http://www.w3.org/TR/xhtml1/#prohibitions As for the older HTML 3.2 spec, the section on the FORMS element states that: “Every form must be enclosed within a FORM element. There can be …
Clause 9 of the standard allows class {public: int i;} (note the lack of a final semicolon) because this decl-specifier-seq for an unnamed class might be used in some other construct such as a typedef or a variable declaration. The problem with class {public: int i;}; (note that the final semicolon is now present) is …
If you want to write portable C code, then I’d suggest you to write in C89 (old ANSI C standard). This standard is supported by most compilers. The Intel C Compiler has very good C99 support and it produces fast binaries. (Thanks 0x69!) MSVC supports some new features and Microsoft plan to broaden support in …
The answer is no, because of the definition of “lifetime” in §3.8/1: The lifetime of an object of type T ends when: — if T is a class type with a non-trivial destructor (12.4), the destructor call starts, or — the storage which the object occupies is reused or released. As soon as the destructor …
According to the documentation: getFields() Returns an array containing Field objects reflecting all the accessible public fields of the class or interface represented by this Class object. The elements in the array returned are not sorted and are not in any particular order. This method returns an array of length 0 if the class or …
–> is not an operator. It is in fact two separate operators, — and >. The conditional’s code decrements x, while returning x‘s original (not decremented) value, and then compares the original value with 0 using the > operator. To better understand, the statement could be written as follows: while( (x–) > 0 )
According to this page (the 5.0 online manual), it’s for better performance and user convenience.
childClass::customMethod() has different arguments, or a different access level (public/private/protected) than parentClass::customMethod().
python -mwebbrowser http://example.com works on many platforms