name hidding again

-
the name hidding seems to be pretty compiler specific unfortunately.
for example:
struct A
{
int x;
};

struct B: A
{
int x;
};

struct C: A, B
{
void f() { x = 0; }
};

int main()
{
C i;
i.f();
}
here
http://publib.boulder.ibm.com/infocenter/comphelp/v8v101/index.jsp?topic=/com.ibm.xlcpp8a.doc/language/ref/cplr138.htm

it says that "The assignment x = 0 in function C::f() is not ambiguous because the declaration B::x has hidden A::x."

when i see this I was confused, what the hell; indeed, B::x hiddens A::x but since i is of C type, both B::x and A::x are available to C.
i just put this code in Visual C++ 2003 and it gives (of course) the compile error:

e:\Projects\test2\test2\test2.cpp(15): error C2385: ambiguous access of 'x' in 'C' could be the 'x' in base 'A::x' or the 'x' in base 'B::x'

now, i bet that there are many things like this, compiler specific (the C++ ref from the link is for the IBM compiler);
and this makes life harder.

on the next interview, you can be very smart and write that this code works OK; if you get a mocking smile, you can ask politely "do you have an IBM C compiler ?"

Comments

Post a Comment

Say something nice please.

Thank you.

Popular posts from this blog

IconFont2Code, my open-source tool in order to view icons in font files and create C# class with the glyph constants

-
Image
As an app developer, it's impossible not to have the task to display an icon in the app. One of the common ways to display icons , instead of using images or SVGs , is by using font files (.ttf, .otf or .woff). Although font files are usually used to display text with a specific font, but they can also be used to display icons . Instead of containing glyphs with letters , they contain glyphs with icons : There are different types of font technologies but the most common ones today are the TrueType (.ttf), OpenType (.otf) or the WOFF (.woff) font files. The way they store and render the glyphs is using a collection of line and curve commands as well as a collection of hint , which allows them to provide both relatively fast drawing speed and true device independence . The  device independence is a key aspect given the myriad of display sizes and technologies which exist today. Referring to an icon inside of a icon font file  works by knowing the hexadecimal val...
Read more

Problems

-
here I will put different little exercices I find. 6th grade problem: find all integral numbers which after substraction to 9999 give the same number without the last digit. for example: abcde - 9999 = abcd damn, it must be easy
Read more

Xamarin.Forms XmlnsDefinition attribute: All of your namespaces become one

-
Image
When working on a mobile app developed with Xamarin Forms ( if  you aren’t, you’re missing all the fun! ) you might have your own awesome separate library project   of custom controls, effects, behaviors, value-converters, constants: You’ve might not been very happy ( to put it nicely ) how you're using your library objects in your app’s XAML, having to deal with all the different XML namespaces and prefixes: So many prefixes and namespaces to handle!  Yikes! The issue is not just about declaration of prefixes. Having separate prefixes bloats the XAML a lot because you have to use a separate prefix for every object you reference from the corresponding namespace. In my example there are 4 prefixes to deal with! As a solution to get rid of all the namespaces, a dark thought might have crossed your mind: remove all the CLR namespaces in the library’s code and just have one namespace! But you love your C# namespaces, they give class scope and separation, it’s...
Read more