Hi, I have a basic understanding of C++, but when I examine real-world code I still encounter lots of confusing bits and pieces. For example, this class declaration from the Ogre 3D source:
class _OgreExport Root : public Singleton
{
...
What is _OgreExport?
Thanks!
_OgreExport is probably some weird #define the Ogre team made.
Yep, it is. You can see it in action here. That is where they defined it.
Basically in C++ there is something called the preprocessor, it's what deals with all the lines that start with # like #include or #define. At the simplest level, it replaces the Macro with the defined value.
In this case, it's to handle the various platforms. For example, for Android:
And __declspec( dllexport) is a non-standard (i.e. compiler specific) feature in Microsoft's compilers. There's some information here on it.
__declspec (dllexport) works with GCC also, when compiling on Windows.
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