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Author Topic: Window Initialization  (Read 1566 times)

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Window Initialization
« on: February 01, 2014, 02:39:17 am »
When I try to create a window object in Visual Studio C++, the line
sf::Window window = sf::Window(sf::VideoMode(200,200),"Title");
works fine, but when I try the same thing in Code::Blocks MinGW, I get a nonCopyable error. Instead I have to use
sf::Window window(sf::VideoMode(200, 200), "Title");
Any reason why?


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Re: Window Initialization
« Reply #1 on: February 01, 2014, 02:44:41 am »
What version of Visual C++ and what version of MinGW?

Because technically, the first one is invalid. You're creating a sf::Window, and then copying it to "window".

Second one you're simply creating "window". Your second example is "more correct". As in you shouldn't want to be copying sf::Window.


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Re: Window Initialization
« Reply #2 on: February 01, 2014, 04:22:56 am »
The first one shouldn't work at all because sf::Window inherits from sf::NonCopyable.

That is also why it doesn't work in Code::Blocks, because it shouldn't work.



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Re: Window Initialization
« Reply #3 on: February 01, 2014, 05:06:16 am »
I don't understand it too well, but Copy Elision could be the culprit, i.e. Visual Studio is treating the first code sample as if it were the second because the copy can be easily avoided.


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Re: Window Initialization
« Reply #4 on: February 01, 2014, 01:36:58 pm »
C++ doesn't allow copy elision if the copy constructor is private (or deleted). The observable behavior must remain independent of optimizations.
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