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# GNU C++ Conformance to ANSI C++

These changes in the GNU C++ compiler were made to comply more closely with the ANSI base document, The Annotated C++ Reference Manual (the ARM). Further reducing the divergences from ANSI C++ is a continued goal of the GNU C++ Renovation Project.

Section 3.4, Start and Termination. It is now invalid to take the address of the function ``main()'`.

Section 4.8, Pointers to Members. The compiler produces an error for trying to convert between a pointer to a member and the type ``void *'`.

Section 5.2.5, Increment and Decrement. It is an error to use the increment and decrement operators on an enumerated type.

Section 5.3.2, Sizeof. Doing `sizeof` on a function is now an error.

Section 5.3.4, Delete. The syntax of a cast-expression is now more strictly controlled.

Section 7.1.1, Storage Class Specifiers. Using the `static` and `extern` specifiers can now only be applied to names of objects, functions, and anonymous unions.

Section 7.1.1, Storage Class Specifiers. The compiler no longer complains about taking the address of a variable which has been declared to have `register` storage.

Section 7.1.2, Function Specifiers. The compiler produces an error when the `inline` or `virtual` specifiers are used on anything other than a function.

Section 8.3, Function Definitions. It is now an error to shadow a parameter name with a local variable; in the past, the compiler only gave a warning in such a situation.

Section 8.4.1, Aggregates. The rules concerning declaration of an aggregate are now all checked in the GNU C++ compiler; they include having no private or protected members and no base classes.

Section 8.4.3, References. Declaring an array of references is now forbidden. Initializing a reference with an initializer list is also considered an error.

Section 9.5, Unions. Global anonymous unions must be declared `static`.

Section 11.4, Friends. Declaring a member to be a friend of a type that has not yet been defined is an error.

Section 12.1, Constructors. The compiler generates a default copy constructor for a class if no constructor has been declared.

Section 12.6.2, Special Member Functions. When using a mem-initializer list, the compiler will now initialize class members in declaration order, not in the order in which you specify them. Also, the compiler enforces the rule that non-static `const` and reference members must be initialized with a mem-initializer list when their class does not have a constructor.

Section 12.8, Copying Class Objects. The compiler generates default copy constructors correctly, and supplies default assignment operators compatible with user-defined ones.

Section 13.4, Overloaded Operators. An overloaded operator may no longer have default arguments.

Section 13.4.4, Function Call. An overloaded ``operator ()'` must be a non-static member function.

Section 13.4.5, Subscripting. An overloaded ``operator []'` must be a non-static member function.

Section 13.4.6, Class Member Access. An overloaded ``operator ->'` must be a non-static member function.

Section 13.4.7, Increment and Decrement. The compiler will now make sure a postfix ``operator ++'` or ``operator --'` has an `int` as its second argument.

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