[C++] sf::RenderWindow

[Ninjasturm]

Hello Community

(I'm really sorry about my English).
I have a problem.
Here is some source code (I think then you now what i mean, i hope).
[CPP]
void Class::SetRenderWindow(sf::RenderWindow &App)
{
this->App = App;
}
// Now i call the Method
Class.SetRenderWindow(App);
[CPP]

Compiler output:

||=== **** Test, Debug ===|
||Info: resolving vtable for sf::Spriteby linking to __imp___ZTVN2sf6SpriteE |
||warning: auto-importing has been activated without --enable-auto-import specified on the command line.|
C:\Projekte\C++\********\.objs\main.o||In function `ZSt38__copy_backward_output_normal_iteratorIPPN2sf5EventES3_ET0_T_S5_S4_12__false_type':|
)]+0x26)||undefined reference to `sf::NonCopyable::operator=(sf::NonCopyable const&)'|
)]+0x26)||undefined reference to `sf::NonCopyable::operator=(sf::NonCopyable const&)'|
||=== Build finished: 2 errors, 1 warnings ===|

I use Code::Blocks and my Compilier is MinGW but i think the error is the overloaded operator =

[Nexus]

The operator= is not provided, because sf::RenderWindow is uncopyable. You should instead store references or (maybe smart) pointers to it.

[Finn]

Or use sf::RenderTarget as a parameter instead of sf::Window

[Nexus]

Or use sf::RenderTarget as a parameter instead of sf::Window

As sf::RenderTarget is also noncopyable, this approach isn't really an alternative.

[Ninjasturm]

Can i edit the = operator of the NonCopyAble Struct.?

[Hiura]

Technically yes BUT :
-> you have to create your own version of SFML (but I'm not sure if it will even work...)
-> and more importantly : that a very bad idea!

If this class doesn't allow to be copied it's not for nothing.

Nexus gave you a good solution :

You should instead store references or (maybe smart) pointers to it

[Nexus]

No (of course you could, but not without changing SFML, which would be pretty stupid in this case).

There is a semantic reason why sf::RenderWindows cannot be copied. You don't need to copy it anyway, I already proposed alternative solutions.

[Spellbreaker]

You can only use init lists in the classes constructor, like this example:

Code: [Select]


class myClass {
    sf::RenderWindow &app;
    myClass(sf::RenderWindow &app);
}

myClass::myClass ( sf::RenderWindow &app) : app(app) {
   <foo>
}



int main() {

sf::RenderWindow App(...);

myClass foo(App);
}